Inside the Closed Loop Laser Beam Stearing Galvanometer.
Vložit
- čas přidán 1. 06. 2024
- A brief history of the Galvanometer followed by a tear downs explaining various commercially assembly optical based closed loop laser gavos. How they work, what's inside and a little on what drives them and even a little repair guide as well.
- Věda a technologie
![DIY Saturday [20161224]: Galvanometer kit for laser projection -- Part 1](http://i.ytimg.com/vi/S0EcMjA2T6I/mqdefault.jpg)
![[柴犬ASMR]曼玉Manyu&小白Bai 毛发护理Spa asmr](http://i.ytimg.com/vi/0TsXQ7z2Dh4/mqdefault.jpg)
#1 cut those septic finger nails, no self respecting woman is going to want that in her guava
What did you forget about tongue, dick, and toys?
I left high school a long time ago...
@Jesse Toms Thanks for the comment! I certainly don't plan on stopping any time soon as you see there is plenty of stuff on the desk to cover lol.
i swear to god this guy gets like the same comment on every video
@@tiny3607 There does seem to be some hint of a repeating message of sorts. I keep trying all the best ciphers and algorithms I know and still have yet to figure out what it all means.
wow
one can notice a laser enthusiast by the dead pixels in his videos
I go through soooo many cameras lol
In one video I actually say I have no intention of getting a good camera cause I will just destroy it.
Luckily a lot of pretty ok old phones ( usually just cracked screens ) come in to keep up with it lol.
I will never have an original thought in youtube comments.
@@MrDehicka The simulation takes fewer resources to run by recycling such things as ideas.
Woha, finally ! Not so easy when you don't know the right keywords. Started googling for laser mirror and finally found galvo's
Great video. I was looking for something to explain how 'laser show' boxes work and this is the only video that not only shows this, but goes into detail about the inner workings of components. It should be the first search result. Thanks!
That's actually really cool! I would have never thought that it used a little mirror and a light source. Definitely thought it would be an arrangement a little like a servo in a CNC machine with a disk and a photodiode. Awesome vid too!
There is no any other both basic and deep informations about galvos but this video and this channel's other videos. Very useful!
Thank you!
Thanks a lot for sharing! Very well explained, with a very detailed close-loop designs of different variants.
"... If you have to ask for a quote, you can't afford it!" Lmao too f'ing true brah.
Returned on 17AUG22 :You Are Excellent doctor to dissecet the galvo , i was looking for the same .! Thank you.
Laser surgery is a way of life, it's my way of life! I am happy to hear you found the video useful.
Laser surgery is a way of life, it's my way of life! I am happy to hear you found the video useful.
Great video Sir . I was searching this for long time .
This is brilliant info for a project I have in mind
As a kid I used HDD voice coils to do this. Played music to them. Even had one with two to do stereo.
One of the few videos on CZcams with no dislikes
I get a few here and there. I try to run a helpful no BS channel and most people appreciate it.
Zenodilodon yeah after watching a lot of your videos, I’ve only seen one dislike, love your vids, definitely no bs here.
Your vids have actually got me into making my own show laser, I just don’t know what I will use
Great video! I seem to be lost understanding something. If I’m using a galvo with a high power fiber laser. By positioning the galvo further away from subject. Will it have a larger surface area to cover? Most galvos max area is 24”x24”. Is turning up the laser power and moving the galvo further away a solution or will the image be distorted attempting this? Would love to know your thoughts on engraving larger surface areas. Thanks in advance!
Nice in depth video! I've never come across galvos in any of the devices I've taken apart. Hopefully one day I will buy some and play with them : )
Looks like you get into all sorts of things! Galvos are pretty specific devices and not in many consumer goods. I have thought about maybe taking and making an engraver with one of my spare kits. Any ideas on what you would want to use galvo systems for?
@@Zenodilodon Yes, most low end laser projectors use stepper motors or other open loop systems. Projects? Quite a few in mind actually, the obvious laser scanner for light shows, vectors and experimental tracking alongside laser engraving with pulsed lasers and a resin based 3D printer! I'm currently looking into trying some coreless motors and try to make a crude version of optical positioning, but that's quite far down the list at the moment!
@@oid123 It looks like you have a good comprehension to make your own galvos, does this interest you and do you have FB?
@@Zenodilodon Yes, it's been on the To Do list for years... I fell in love with ELM-chan's DIY galvos and later discovered the optical feedback ones instead of capacitive feedback. My laser collection is growing and I need a reason for more!
@@oid123 Do you ever really need a reason for more lasers?
I mean I lost count a while ago and I am still purchasing more lol
Very good video, thanks!
Very informative. Thanks!
share this on the SLA 3D printing group, very insightful thanks
Best explained I ever listen.
this video was super helpful and funny thank you
You have my dream job when I was a teenager. Now I just fix air conditioners and I am too bored.
Get into something you really enjoy, it's possible to do nearly anything you want. I thought once that doing stuff with lasers and optics was impossible but as soon as i put my foot down on learning and pursuing my interests things started to happen towards that goal. You'd be mighty surprised at the outcome of following a passion, I promise you won't be bored!
Not 100% sure on this but I *think* there was also another feedback method that used rotary capacitors (like in old AM radios), it' *might* have been used by General Scanning, Inc back in the '80s (It's been a long time since I fiddled with laser projectors so I may be wrong...). Great video, you've earned yourself another sub :)
You're correct! The capacitive closed loop design is actually on this channel for viewing too. Check out the Raylase video I posted. Welcome to the channel!
great video thanks
Thanks! I am considering doing an update with tuning advice and discussing what could be a product in development. I made this niche tool specifically designed to test common galvo issues in seconds!
Great video and explanation. Also good job on the rebuild. What brand of galvo were the capacitance feedback models?
Hey Adam, no capacitance feedback galvanometers where in this video.
Also thanks on the rebuild!
@@Zenodilodon Ah, I was working while watching your video, missed the part where you pointed out the LED and thought it was using variable capacitance as a feedback. I get it now, never seen that design before. Thanks!
The galvo brand from that model i think was Gold Star ( GS400 ), they look a lot like Cambridge galvo designs it seems.
excellent description of various galvos. A couple questions. First, is there open source software that works with closed loop galvos and second, what pps rate would be needed for laser sintering?
I am a hardware tech, there is code for DIY show lasers and running galvos. I suggest looking that up on instructables.
What PPs rate is needed for sintering? Logically I guess anything above 0? What's the material, what's the laser power? 30-40kpps is pretty industry standard but you can use almost any speed that suites your needs as long as the mirrors are rated for the laser power you're reflecting off them.
I'm doing some work with the first generation Formlabs 3D printers. We have a user in the community who has a galvo that does does not move at all. We ruled out the other components by basic troulbeshooting (moving wires and testing the galvo in another working 3D printer). Do you have any tips for troubleshooting and repair? Or do you think in this application that replacement is the only realistic option?
I would start by checking coil continuity on the galvo, sometimes the wire near the solder point can give way. If it's open check those points. If there is a break in the coil inside it's most likely not serviceable. Galvos are also usually paired with an amp. You have to replace the galvo and it's amp at the same time to ensure proper tolerances and scaling as well.
Enjoyed your video! I am intrigued by that voice coil mirror you showed as a second example. Where can I find some of those? All the best!
That mirror assembly was I believe pulled from a Laser Disc player. I was not the one who took apart the original machine but that's what I was told. I am not sure where to buy one, but making one shouldn't be difficult. rip a voice coil out of a speaker, find a suitable magnet and figure out the mechanicals. It's not very fast, nor accurate at any speed but it's nifty looking!
True, it does look like old tech. When I search Laser Disc player, I find mostly DVD players, but they use much smaller voice coil assemblies and not galvanometers. You are right - the device here looks like an easy build. @@Zenodilodon
Cheers
Hey! very good overview, there is a question: if I use an advanced control board for a cheap galvo, can I get better positioning accuracy and speed?
KPPS is a mix of the ability for the galvo to accelerate and break. This is a hardware rating and is not measured on the software level. To improve accuracy on the software to hardware portion the DAC is the most important as the higher the bit the more points you have in galvo positions. However to achieve a quick response with accurate positioning a high KPPS rating is required. It's a driver + car performance mentality.
@Arpad Toth Glad to hear, I take it you got my email reply as well?
Brilliant video, thanks! We have an instrument with a pair of galvos run by a GSI Lumonics XY controller board that is now failing randomly, leaving the galvos in the resting (midway) position. There are identical boards on sale in eBay. Any chance a replacement might work without extensive recalibration/tuning?
You may be able to get another board to work without much tuning yes, given that the mirrors where similar on those galvos as to yours. Most of the time some tuning will need to be done to get the best and most accurate performance and life out of your galvo system.
Tuning instructions can be found here.
czcams.com/video/hNGTKNW99Zw/video.html
@@Zenodilodon Precious input, man, we might give it a try - thank you very much!
What would be the best frequency you could achieve as a laser oscillograph? Could it output 15 kHz horizontal sweep? And what's the on-off frequency you can achieve with these diodes? Instantaneously? I am thinking about building a monochrome projector that could project 512 x 512 pixels at 60 Hz frame rate on the wall of a building. Is it possible?
www.scannermax.com/products/scanners/
www.cambridgetechnology.com/?gclid=EAIaIQobChMI89mKj9u66wIVEr7ACh09zQ94EAAYASAAEgLWCPD_BwE
^ Best scanners
Laser modulation can be in 100+ Khz with suitable drivers.
innolasers.com/shop/index.php?id_product=11&controller=product
optlasers.com/laser-diode-drivers/
Hi, I was wondering, the signal input is the setpoint position ? I mean, to make one single galvo spin, what kind of signal I have to use ? If it doesn't spin, couse of degree limits, what kind of singal makes the mirror bounce back and forth ?
Galvo amps used a +5v -5V reference for input. The 0 set mark is held with no signal, a signal voltage between 0 and +5 will make it tilt % one way and a signal voltage between 0 and -5V will make it tilt % of the other way.
Nice and insightfull video! Have you got any video's on how to balance the mirrors, or some source that ilaborates on that?
Physical attachment and balance of the mirror is often done with a jig of which the galvo rests in during attaching the mirror. I don't have one of these so I end up doing the best I can with spacers and a calipers. Tuning the galvos for the mirror is usually a long task of seeing where each calibration pot needs to be set for best performance. I try to replace galvo mirrors with a close to OEM mirror so I only usually do minor tuning. I don't have a video up on the tuning. I do have some points in videos where I put mirrors on but I don't really go into details on balancing, mostly because I don't have a jig for it and I want to get one before I cover that topic.
Nice video! Makes everything a lot more clear! I have a problem with the glavos of my laserworld cs 2000. All of a sudden when I started the laser my y galvo seems to be 90 degrees off. Do you have any idea how to solve this?
Does it still move? If so it could be a failure in the main IC on the galvo driver or the mount could of become loose causing the entire galvo to rotate in the mount. If the galvo does not move than it's a larger problem. It could also be a failure in the main amp IC, regulator IC, or a bad galvo entirely. You can track down the fault by swapping the galvo connections ( linking x to the y amp and vise versa ) which will help determine the point of failure. Sometimes you can get just a single galvo and replace it. If you are going to replace the galvo I would suggest either going through the OEM, or looking over what's on the market. Your laser world is a low-mid tier unit so you probably can find decent replacements on eBay or Amazon, however you should also note to get a kit that is suitable to your PSU ( Best to aim for the 24v-/+ kits as they perform the best overall and are capable of working down to 15v-/+. That's about the best advice I can give you on trouble shooting, from that point you will have to continue on based on your level of technical awareness and tools.
@@Zenodilodon thank you for the information. I'm looking for a specific part in the back of the galvo which is easiest explained by a photo. Can I send you a photo through email or by phone?
@@666jw666 Sure, my email is Zenodilodon@gmail.com
Hello do you might know where to get some spare parts for galvanometers? Because I'm looking for the small plastic part in the back from a glavo that prevents it from turning 360 degrees but on most websites they're only selling complete sets.
You can find the mirrors from laser manufactures, usually OEMs of galvos or sometimes on eBay. Beyond that there really isn't a place to get galvo parts. The cores are usually made at the OEM and from there it's bearings, magnets, and LEDs that are outsourced. Once you identify those parts you can replace them by searching for suitable components from manufactures. IE for the diametrically poled magnets you would need to determine the physical properties and contact a magnet supplier.
Thanks a million bro
now im off to making my own galvo, to see how it does. im thinking 2 magnets being repel by 2 electromagnets in a sea-saw set-up using pwm, control the duty cycle intern should control the angle.
I have a question: Is it easy to buy the closed loop galvos ? I would like to buy some but all I can find are kits that include the controller board, and I am not able to find any part numbers for the galvos alone. Do you have any hints? Thanks for this instructive video btw :)
You can often ask sellers on eBay to drop the show card/DMX board if you send then a message. For other options on galvos check out the links below.
www.spacelas.com/en_products/Galvo-Scanner-Systems-5-1/
www.phenixtechnology.com/index.php
eyemagic.gr/laser-scanners.html
www.cambridgetechnology.com/products/galvanometer-scanner
www.scannermax.com/products/scanners/
Hope this helps!
@@Zenodilodon Yes, thanks a lot !
what is core material used in servomotor?
I was looking for this exactly. Any Idea where I could get those stearing galvos?? I am trying to position a laser line left or right positions...
www.amazon.com/Generic-Galvanometer-Optical-Scanner-Including/dp/B01IZPMUPO/ref=asc_df_B01IZPMUPO/?tag=hyprod-20&linkCode=df0&hvadid=312151212938&hvpos=&hvnetw=g&hvrand=6533989919903814802&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9030220&hvtargid=pla-570881550468&psc=1&tag=&ref=&adgrpid=65054436434&hvpone=&hvptwo=&hvadid=312151212938&hvpos=&hvnetw=g&hvrand=6533989919903814802&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9030220&hvtargid=pla-570881550468#HLCXComparisonWidget_feature_div
Thanks man 👌
Can piezo deflectors be used for this type of application?
Absolutely! There are few companies that use it in laser show applications, it's used in micro beam steering and maybe laser TV and medical applications as well. Eventually I would love to have some to feature on this channel!
www.pi-usa.us/en/products/piezo-flexure-nanopositioners/fast-steering-mirrors-fsm-and-piezo-tiptilt-platforms-for-active-optics/
www.laserfocusworld.com/software-accessories/positioning-support-accessories/article/16551608/micro-beam-steering-precision-micro-beamsteering-systems-simplify-move-to-handheld-instruments.
Thanks for the insightful insights!
What could be the cause of the backlash (about 50-100 μrad) of a cheap Chinese galvo?
What influence could a greater friction (viscous) in the galvo bearings have on the position regulator?
The galvanometer and drivers are not housed and exposed to resin vapor (SLA printer).
The effect may even exist before exposure.
PS: I'm glad that it does not just look so tidy with me ;-)
The "backlash" is caused by the lack of an error integrator in the cheap galvos. This is omitted to get the highest possible kpps rating without needing to worry about windup and overshoot.
cooool thank you very much... are there any hobby grade cheap galvos that can be bought?
www.amazon.com/Generic-Galvanometer-Optical-Scanner-Including/dp/B01IZPMUPO/ref=asc_df_B01IZPMUPO/?tag=hyprod-20&linkCode=df0&hvadid=312151212938&hvpos=&hvnetw=g&hvrand=6533989919903814802&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9030220&hvtargid=pla-570881550468&psc=1&tag=&ref=&adgrpid=65054436434&hvpone=&hvptwo=&hvadid=312151212938&hvpos=&hvnetw=g&hvrand=6533989919903814802&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9030220&hvtargid=pla-570881550468#HLCXComparisonWidget_feature_div
Great Video,i have a Question,in wich Potentiometer can i change the size of x and y
It's usually one of the far end potentiometers. Sometimes they don't put a holding glue on the size and that helps as well. The location of the potentiometer may vary so keep track of any and all adjustments made while attempting to locate it.
Also note that if you increase size you will need to somewhat inversely decrease your scan speed to prevent damage to your galvo system.
Hi, my galvo laser is engraving wavy lines, like it was handwritten. It's a Trumpf unit. Could it be the galvos failing?
Yes, this is often a symptom of failing galvos. It's usually either due to bearings starting to go, the mirrors becoming loose on the ends of the galvo, or failing magnets. If it's magnets the galvos should work pretty decent when scanning smaller angles. If the mirror is loose you will be able to do large squares with little problems but the corners will look a bit off. You can carefully check the bearings to see if the galvo shaft is a little loose. If your printer uses analog galvos with a -/+differential signal then you can easily find and calibrate an off the shelf galvo kit. If you have questions on what galvos may work best for you email me pictures of your current galvos and galvo amps. Zenodilodon@gmail.com
@@Zenodilodon thank you for the answer! I'll run some tests and show you what I've got.
hey man, im looking for some instructions of figuring out the wiring of my non feedback galvos, i wanted to add a flipping switch but i cant find a good tutorial on the wiring schematic.
flipping switch, like to invert the signal to a galvo or to swap x and y?
Can the voice coil mechanism of the OPU of a CD/DVD/Bluray burner be used or modded into a galvo for projecting laser show vector graphics?
Not really, the spring suspension has there own resonance oscillation which make the unit unstable, the power to weight to cooling ratio makes it also susceptible to over heating when it's driven at a higher speed/torque. There is no closed loop compensation either which would make for a very sloppy open loop system. If you're looking for a simple DIY thing to play with speakers have been the go to on that. Maybe also hard drive arms as well but your results will be terrible unless you really go into using galvos. Even with galvos to get reasonably good graphics can be quite a feat.
@@Zenodilodon I saw this science video about modding the DVD pickup into highend nano-microscopy gear, and I am intrigued what else can be done with that component.
Hacking CD/DVD/Blu-ray Optical Pickup Unit (OPU) for Fun and Scientific Research:
czcams.com/video/5bqujaldaCQ/video.html
I saw the DVD burner can tilt its lens in various ways, and it would be interesting to project something with it. I definitely do not itend to run the internal red laser diode at its full 150mW (rather 1mW through a resistor - I do not want to blind myself with such a cat igniter), so overheat will be less an issue, unless the coil itself is too heat sensitive.
@@AerialTheShamen For small movements/deflection as decent speeds you will be ok. The trouble comes in when you are trying to deflect the mechanism to far or too fast. The coils can get warm and have little heat dispersion but that's for fast/wide angle applications. The video is pretty neat, there are certainly a bunch that can be done with the OPU, I haven't really ventured into using them for much of anything myself though.
Would installing a lens after the deflection unit help to enlarge the picture?
Yet I haven't built anything, but the idea of making something like this of DVD writer parts and e.g. an Arduino (or simply analogue audio input) appears fascinating. I do not want to run it in a disco or such (only a meditation room/temple), so the picture doesn't need to be bright.
@@AerialTheShamen Yes, you can use a complex set of lenses to make the scan angle wider, however you will run into issues with the beam size and chromatic aberration issues as you increase the input size vs the output size in angle. If I may be quite frank on the matter though, there is good reason why galvos are used. A they can support optics that can handle the power densities of a relatively powerful laser and B they are very effective and also have close loop feedback. You won't get very good results using much in the means of DIY for getting good results. This of course depends on your complexity of pattern projected. Galvo kits start pretty cheap on eBay for about $80 USD. There is also a page that you can look at for DIY laser galvos.
elm-chan.org/works/vlp/report_e.html
Can we draw line, circle and sinusoids wave using two axis galvo with single laser source in a stationary table???
Absolutely, some people have hooked them up to synthesizers.
czcams.com/video/jxVou1zGvgQ/video.html
The link shows using an interface but as long as your input signal is -/+ 5 volts analog from your source you can pretty much use a pair of galvos exactly like X/Y function on an oscilloscope.
@@Zenodilodon How can you convert a typical Audio source (~0-5v) to (-5v-+5v)?
@@CalvinBlackArt, You can use any linear audio amplifier, but not digital. I would say to look for an old school cheap pair of computer speakers for a whole board to work with, many galvo kits can so up to 10 volts but I would suggest keeping it under 6.3v, if you can find one powered by USB you will be set. Just wire the speaker outputs the galvo amp input and use volume as a gain.
@@Zenodilodon That's awesome to learn. So, how can I be sure that I'm not getting a digital amp inside an old computer speaker setup?? Thanks for your knowledge!
this is a great " IN - TO " hardware lesson.
Is this your profession , repairing these devices ? Now i have seen the internal components, why is the cost for those closed loops galvanometers so high ? Have u some drawings or links to DiY galvo controllers, or a link to obtain a complete x-y set ?
I have a 10K Rgb text and figure Laser.
I want to build the Colums game, RGB laser projector (i have the scematics and specs) to use the MB - VECTREX GAMES (1984-1990)
Best regards from Belguim.
Thanks the for the comment! Yes I repair laser tech and work on custom LED hardware for an occupation. Galvos that handle faster scan speeds are often more expensive not just do to the components but they tolerances of assembly and running operation. Tighter bearings, more thermally restive glues to hold in the coils, more time balancing mirrors those kinds of things.
Yes I do have some info I can get to you on making your own controllers, somewhere i have some of the Cambridge designs. You can look up galvo kits on ebay by kpps. Contact me over FB for more info /Zenodilodon if you can.
I am starting to learn about galvo systems. I was just wondering if there is any way to control the galvo with a software. Could you please refer me to a tutorial where it is shown step by step?
The systems that I work on are all externally controlled through Pangolin software/hardware. I am only a hardware technician and cannot assist you with DIY interfacing/programming. However I suggest you look into this for more information.
www.instructables.com/Arduino-Laser-Show-With-Real-Galvos/
I need a dual axis laser beam galvanometer steering module with driver for my arduino do you where I can buy one
Can stepper motors be used for glavo and mach3 sofware?
Steppers are really sloppy and slow compared to galvos.
You have shot a very useful and timeless video. Thanks. I have a question. I wonder if the head motors used in HD can be used? Is it possible to achieve higher performance? If possible, can you try something like this? :-)
Hard drive actuators have a weaker power to weight ratio. There is a reason why wheels are around, a reason why roofs are slanted, and why speakers haven't changed much. There is usually an optimal configuration for a task and the materials and geometry that a galvo uses is pretty much the ideal assembly. There isn't really a good away to do closed loop with those actuators either. The heads scan for stuff on the disk, they are not searching for their own location.
Thanks for the compliment, I try to aim for timeless information. No point in making temporary educational content lol.
Nice vid, can i use the fiber laser to replace my co2 laser.?
You should be able to use a fiber coupled laser as a replacement. Just make sure the power is equal too or greater for best results.
Thanks i just replace the co2 but the mirror lens will remain?.. for 1390 engraving size..
@@manplusideas6757 I don't understand the question if you're asking for something to be clarified. You will need a collimated fiber coupled laser, the optics that are in the assembly after the Co2 laser should remain. The output from the collimated fiber laser should be very close to the output of the Co2 laser.
Ohh.. ok i get it.. thanks for the reply.. try it next time..
One Question ...
When I was thinking to build my own galvo lots of doubts Came on like
Suppose you build Galo that works on 10 volt + and - , and 0 is the center Position of its rotor and you put 1 Hz Sine and its position swings back and forth from the center with 10 volt + , - suppose 30° , But as you will rise the frequency with same voltage it will rotate Back and forth at that frequency but its Mechanical Amplitude Would be Lower with Frequency going up because of Inertia so to compensate this power of the coil should also increase with frequency to archive constant amplitude with All frequency .
Same with Coil impedance, which goes Higher with Increasing Frequency so Amplitude should go lower .
Is it real problem with Open loop Galvo ?
Most signal inputs are 5+/5- with 0v being center/home. That's what is used for the voltage for the show laser type stuff. Some galvos may support higher voltages but I'd stick with 5v and set your needed master scale/size from there. ( potentiometer on the galvo amp ) if needed. The size/frequency issue you speak of where faster frequencies are smaller is only an issue on open loop galvos. Closed loop will do it's best to maintain the correlation between signal speed and amplitude across all ranges.
Open loop galvos will tend to have in inverse effect. 30hz at x wattage will have double the deflection of 60hz at the same wattage. You are trading the energy of travel distance in for faster changes in velocity. (120hz(x4 the acceleration =1/4th the deflection @ equivalent wattage).
Hi Nice Dissection's ! Is it possible to build at home of such precession galvos?
Yes there is, here is a web page showing how it's done.
elm-chan.org/works/vlp/report_e.html
@@Zenodilodon Thank you!
What's the. Maximum frequency it can work in khz?
Will it work on 15khz with same deflection angle?
The galvos really only run around 200-500hz when operating. KPPS or kilopoints per second is not equivalent to oscillation capability. This speed is reduced with wider deflection angles.
@@Zenodilodon so that's tha maximum speed that galvo can physically run?
@@omsingharjit In talking to an engineer discussing LIDAR use with a 50KPPS system he said that as max deflection the top speed was 200hz and he wished speeds could be increased. These use pretty tiny little coils and any more power tends to burn them up. However if you do not require instant deceleration ( such as a sine wave input/output ) you could probably go a bit faster since your not using a bunch of power in the galvos to decelerate.
This information is concerning above industry standard speed of 30KPPS so keep that in mind as well. Even 200hz at max deflection angle is expensive to accomplish with a closed loop galvo system.
@@Zenodilodon searching on Google and GPT3 it says it can go 4khz or even 16khz !
Hi, are there an open-sources controller for the Galvano system, please?
Thank you
There are ones you can make with Arduino. I don't work with open source controllers though so you will have to find that information on your own.
There are several open source laser control software packages for doing shows, if that's where you're headed. Most of them are only compatible with specific DACs to convert either USB or Ethernet from the control software's PC to ILDA standard analog signals for your scanners and laser driver board(s).
Most professionals use expensive Pangolin software (Quickshow or Beyond), which is only compatible with expensive FastBack 3 or FB4 DACs. The Beyond software and FB4 are ~ $1,500.
I use LaserShow Xpress Basic (2 projector license) and Etherdream 3 DACs, totalling $700. Instead of starting from scratch, I chose 2 New Feel 3 Watt RGB projectors (w/special ordered 40kpps galvos) @ $350 each, because I wanted to start with a fully functional laser system.
There are also less expensive USB DACs, galvos, and free show software, but you'll get what you pay for.
Hope this info isn't too late and is helpful. I'm luvin my lasers and playing with waveform imagery :-)
Hello Zenodilodon, can you make a video about tuning laser galvo's?
Eventually yes, however most of the repairs I do usually have bad galvos and new ones come tuned so very few of the thing I work on require tuning. I am a bit rough on tuning procedures as of now. I may be going in for classes for tuning galvos next year and will be much more equipped to make a good video for the topic afterwards.
Hello good time.I want to make a galvanometer laser scanner ).What software should I use to get the shape I want on the curtain?
It really depends on your level of technical skills, if you are just starting you can use try to make your own system with aurduino or try something like LSX and the Either Dream DAC, or Pangolin QuickShow wit the FB3 DAC. Many galvos require special hardware called a DAC in order to operate with a certain program. I recommend looking into Quickshow+FB3 myself, LXS+ Either Dream is cheaper though.
@@Zenodilodon Thank you very much. This is a university project. A student before me has done almost all the hardware work. And the galvanometer can create a simple rectangular shape on the screen. Master asked me to create complex shapes on the screen and Next, get the scattered back beams to display the surface shape on the computer so that it can detect and analyze shape irregularities.
Nice vid, so, my gesture about rotating mirrors was not that far off.....
Hi
it is very interesting what you have explained with the galvanometer. I know it long time ago . but what I wonder. if we replace of the simple laser another one like engarving laser . what would it .
sincerely i respect people who do research loke you
thanks
sory for my bade englishe translation
Yes you can use galvos for engraving. There is an upside with resolution because you are not using stepper motors, however you do not gain speed unless you can supply larger laser outputs. Laser power output determines how must the machine can process in a certain time. Another issue with galvo is that the focus angle changes unlike a motorized x/y table. On a motorized x/y table the laser is focused into a pinpoint over the target surface, however with galvo the distance from the laser and the target surface is not fixed. On language, if you tell me what you speak I can attempt to technically write any answer to your question better and run it through google translate. I hope this helps!
I have a issue with galvo 9268Ythe mirror is jammed and doesnt move freely.Please guide me.Many thanks
Sounds like the galvo amp may of failed or the galvo over traveled and got stuck. In this situation there is usually a catastrophic burning of the coil inside the galvo. You will most likely need to replace the galvo and amp to fix this issue. You can try to manually free up the mirror but often this is a symptom of a larger problem and will most likely fail again shortly even if you do manage to free the mirror.
You can try to contact the OEM and get a replacement galvo and amp and this would fix the issue. If you are outside of the support/warranty time and need a repair done feel free to contact me and I can give you options for replacement parts or service your unit directly. My email is in the about section on my page.
I appreciate your quick response and will surely connect with you with the details.I freed up the mirrors but the galvo doesn't move
The amplifier board has the 2 smd lights lite up ,so looks like the voltage is reaching the amp board.But I put my finger on the mirrors I don't feel any vibrations or movement on both x and y axis motors.
@@vinaykumardhanapalan1886 do the mirrors lock into the home position and hold still or can you freely move them when they are powered?
@@Zenodilodon they are holding up when powered on
How many times will I have to run my finger on my monitor to try to "clean" YOUR dead pixels? :) :) :) :)
Love Lasers and Robot, two dangerous things!
H i do you do repairs on galvos ie; i need a mirror replacement and tune, on an old CAMBRIDGE TECHNOLOGY closed loop 6000H galvo ,an old one now but its a sick puppy CHEERS
can you do a video about the differences of these galvos and the ones from thorlabs?
Many galvos operate the same as these do including some on thorlabs. Some of them are suspended by torsion springs and do not have bearings in them. Another difference is in how feedback works on some galvos. The ones in this video use optical feedback, if you want to see another style which is capacitive feedback for position sensing check out the video I posted on the Raylase dual axis beam steering assembly.
@@Zenodilodon interesting. I really wonder what makes them so pricey
Do you know Scanlab galvo scanners?
I know of them but I have not used that brand.
Hi, can i use this with labview?
I don't know anything about labview, I can't answer that question.
Hey great video!. At 15:42 do you have any documentation on that board??? Please get back to me, thanks!
I don't on hand have any formal documentation on that model of galvo amp. I do have general experience with them and many other galvo amps. If you have questions feel free to ask and I will try to answer what I can.
@@Zenodilodon alright. I figured out it is a cambridge technology micromax 672. I can find full datasheets for 670, 671,673. Lmao. I am currently curious of what the pinout of the header J4 under the notch filter add on board.
Thanks!
@@Zenodilodon i can use similar datasheet.i have a question.i have xy setup perfectly. However, sometimes at startup x will oscillate and I power off/on and it works. Or... after 45min to three hours x will again oscillate. Any suggestions??
@@supyrow It could be a few things,first 2 that I can think of is either a bad LED or magnet in the galvo.
Other issues could be a failing audio driver IC or operational amplifier. Swap the X and Y galvos and see if the problem stays with the amplifier or the galvo. X often fails sooner in show lasers due to wider scanning angles over head and typically hits the magnet's overall strength.
@@supyrow You can also check the amplifier board for a polyfuse sometimes they can fail and cause similar issues. Not all amps have poly fuses. Google images for an idea of what to look for.
are those electromagnets encased in iron core? or is that just thermal mass?
The electromagnets are in an iron core. This produces a much larger magnetic flux than bare electromagnet coils. The thermal mass helps keeps them cool, but that really is more the job of the scanblock mount for the galvos.
@@Zenodilodon ahhhh that explains it! when i ran my FEA simulation i only ran the case where iron core was touching the electromagnet on top and bottom and next to the magnet rod, not all around the electromagnet. Currently i use a 3 part 3D printed jig to wind the electromagnets with a center punch that i punch out. This works super well for creating properly toleranced windings, but i clearly need to revise this around the iron core. My last design could only hit about 80hz scanning at 60 degrees which is not enough for actual projections. I improved my electromagnet and tolerances but I dont think itll make enough of a difference. I will run some more FEA analyses on different iron core scenarios and refine my design.
THANK YOU SO MUCH for your response. You have saved me a lot more design testing.
@@lazarusmagellan2367 80Hz at 60 degrees....Do you know what's that actually gives you? Top end galvos at 50KPPS only hit like 200Hz at 45 degrees. you're already looking at what could do 25-30 KPPS at normal scan angles easily. That's within industry standards.
@@Zenodilodon Well that's the scanning frequency when I don't have a mirror on it. As soon as I attach the hard disk platter mirror it significantly slows down. I am also using those red single axis 30kpps boards from earlier this year so that would explain the speed. I think when I switch to silicon wafer it will lose a lot less speed and then maybe I can get away with doing some projections without any flicker. Also since having the winding encased in iron increases the flux inside the coil, then I can probably get away with a wider angle too! maybe... Ill have to test it out at least. But I'm excited to try it out. (edit: then I also need to look into software. right now im using csv data to write positions and colors. I think there is some software optimization to be done to make it smoother) (edit #2: Ive run some simulations, it does seem to concentrate the B field within the coil on the horizontal, right where you want it to for max torque on the magnet rod. It also seems to concentrate within the pure iron cylinder right where the electrical coil touches. in one case or another ill test it out irl) (edit 3: I ran some more fea simulations. The iron core does a good job increasing flux right around the perimeter of the magnet rod by around 50%. that is quite the increase. not only that, but it also prevents the magnetic field from extending on over a centimeter beyond out on each side. It seems the thickness of the iron tube encasing the electromagnet does not have as much of an effect on the flux right around the magnet rod. although a thin iron tube tends to lead to higher B field saturation right outside the electrical coil.)
Can we get the video about XY2-100 protocol?
I don't have any galvo systems that use a digital/serial signal. Everything I have here is all on the analog hardware level.
@@Zenodilodon Even theoretical information will be fine. Thanks anyway.
#Zenodilodon
I'm trying to make a real small laser project to sit inside of a PC Mod that'll project patterns and images on the Tempered glass door of the PC... Were could i find a cheap used Galvo set and controller circuit, everywhere I've looked there all brand new and shockingly expensive... after watching your video, I realise two motors wouldn't work, right?.... awesome video by the way, I learnt quite a bit, thank you.
Integrating a laser show inside of the computer could be quite tricky, especially given the available room you mentioned on the other video comment.
A few things to note, most galvos use a +/- PSU and usually 15v and up. This means that you would have to figure out a way to power the galvo amps. There are places you can try to hunt down cheaper galvos. If you are interested in messing around with some smaller/lower speed ones I might have a kit that is somewhat usable for experimentation.
I use Pangolin hardware and software for control, this means that for the most part I am clueless as to a DIY control system. Some have used various function generators for abstract outputs, some have used a sound card or other home made DAC. You will have to figure the control portion out yourself.
You're welcome to drop me an an email for further discussion on your project. Zenodilodon@gmail.com
Thanks. Я искал инфу прог гальво на рускоязычном ютюбе но никто не обозревал его.
Я использовал Google Translate для этого. Из того, что я могу сказать, вы искали видео на русском языке, но не смогли его найти. Вы можете попробовать использовать автоматический перевод на ваш родной язык с помощью кнопки настроек на CZcams. Также вы можете задавать вопросы, и я могу попытаться перевести информацию как можно лучше.
The one with the butterfly is capacitive feedback, i have a book where it is shown in. very simple linear at 90 degree
it's shown in book Measurement Systems ISBN:0-07-100697-4 page 874
meldco.dk/ts/200505.jpg
Nope, it's optical, I am aware of the capacitive feadback systems. The galvo in the video had an IR LED, the 4 sensors where checked for photo-sensitivity during attempt at repair and the amplifier did not have the proper electronics for capacitive feedback.
@7:12 Don't forget the nails bro 😐
Nails are not needed for this project.
@@Zenodilodon Well , not even cleaning the house needed for living .You right
You're*
@@Zenodilodon Thanks & i'm sorry. I speak ok only Swedish and Russian , my main language is Romanian. I learn English to comunicate with people who speak only English.
@@iamwangine8752 lol No worries, I am just giving you a bit of reciprocating banter in the same manor as your original comment.
1:25 had my dying lmao its relaly not that funny im really suffering over here but shit was pretty funny are you brazillian or something
Hahaha, no I just live in a highly Hispanic area so it is the most natural goofy accent for me lol.
@@Zenodilodon damn yo i actually thought like it was repressed childhood memories of struggling with the english language coming to the surface or something, thats sick though, youre a big inspiration man just built my first three colour laser projector in a cardboard box with a single $20 3 colour combining optic from aliexpress shits sick i think its gonna get me laid
@@tiny3607 Thanks for the compliment. Yes, it will get you laid, avoid models and dancers... Look, date a librarian she'll be far less trouble is all I am saying.
Lol. A "pretty simple" driver. Only about 10 or 15 precision set potentiometer knobs. Need 5 years of spaceship satellite balancing and laser focusing alignment to stick those mirrors on there and trick out the drivers just right. But hey. Yea, it's pretty simple.
in concept it is simple, in practice it's complex as heck, you are correct. Any term + laser usually increases difficulty and price, but I figure not scare them all off quite yet. Been there years ago and it can seem like looking up a mountain of questions.
@@Zenodilodon I parted out a bunch of hard drives to prepare the platters, to cut small circles for mirrors. Then, it looks like I have to build a small jig to hold the mirror to the shaft, just right while I play fun games with epoxy glue. I'd rather use some clamp type of mount, but it seems most galvo I seen so far that doesn't cost $1,000 all use glue.
Tis why I said ( if you have to ask you can't afford it ) lol glue to hold the mirrors on is quite common as it's the lightest/fastest solution for high speed scanning in most show lasers, when you start adding any kind of weight on the galvo shaft for mirror mounting hardware it drags things down a tad. What are you making, I can maybe help you out.
@@Zenodilodon Etching. Etch a pattern into a small area of plastic, or metal with a cheap eBay 432nm laser. Right now I am playing fun games with trying to figure out how to focus the laser, aim it, and the distance between the mirrors and the surface. Also have to learn this complicated laser show programs, or write my own source to position the x,y axis for the Helios DAC, just so I can try and test the accuracy of position to a printed test pattern. Super-speed is not really a priority, as much as accuracy.
@@WhatAmIGonnaGet Look into mounting a collimating lens in a larger older optical assembly from an older CD player console. they are usually beefy enough to hold larger lenses. I don't know which way you are going with 432nm is is 532nm or 462nm? :P
Best power for the price is the 2 watt M140 445nm.
As far as the laser show programs and custom DAC programming goes, all I have to say is at least you don't have to drag a fog machine around with you, I hate doing that...
I see your camera is burned from laser output.... It's fun (and sad) to watch all these people reviewing laser stuff and the videos have the damaged camera sensor... I just found mine a week or so ago. Looks like yours only worse... Little purple dots and mess around middle of view...
Oh yea, I go through camera phones as fast as people bring them in. Luckily friends of mine know this and donate broken/old phones for videos. It's a big reason why I don't use a high end camera. It would be like bringing a knife into a gun fight lol
Ok, educate me! Is the camera sensor getting burned from direct exposure? Or is this some photon thing within the room (Reflection/refraction)? I guess the first?
I know what I did... I did a beamshow projected at my camera (cause' ya have to, of course)..
@@EricPenn1147 In most cases you really do have to hit the camera direct on to do damage. Usually reflecting/scattered photons have less energy overall. And yes, you have to do a beam show in front of a camera :P Do have any beam attenuation options/are you running Pangolin software?
I run LSX, so I am now attenuating... Damage is done though. Luckily I can get a new camera for my Note 8 on Amazon, just a bitch to take the old heat gun it my phone...
Thanks!
Cut Nail😐
Singular? Which Nail To Cut?
what is core material used in galvomotor?
Can you be more specific on what you mean by core material? Are you speaking of the neodymium magnet?