DIY Dynamic Balancing !! - This REALLY works !! - Balancing my lathe - Part 1 - Apr 2020
Vložit
- čas přidán 28. 08. 2024
- If you would like to support me and my projects, I have created a Patreon account. Regardless of the amount, every bit helps, will be put to use and is awesome motivation. Thank you so much !! / joel_a
Actual Description.
Part 2 of this video is here : • DIY Dynamic Balancing ...
The CZcams video from Roadracenut. • DIY Dynamic Flywheel B...
The online program. www.emachinesh...
I came up with what I believe is a genius idea for balancing my lathe... the parts need to be balanced while installed on the lathe, so "normal" balancing methods will not work.
This method takes no special tools (unless you consider the lathe to be special) if you have a lathe you should have a dial indicator.
Joel, I can’t thank you enough for illustrating this process. I have a wood lathe. I have always felt that there is a slight bit of vibration imbued in my work by my lathe and not by the workpiece. This gives me a means for a quantitative analysis. Kudos!
Good stuff... ! I have heard that the website that I linked doesn't always work. If this is the case you can always use some trial and error... tho it will take a lot longer.
This is an awesome example of so many eras of tech being used to solve a problem efficiently. It’s sick
Yes, it's very cool !
Brilliant Joe, thankyou. And a HUGE thanks to to emachine shop!!!!!!! What a great looking business. I'll use neo magnets and wrap some Gaffa tape over chuck .....weight of Gaffa is negligible for this. Thanks so much for doing this video.😊
Thanks for your comment. I appreciate it !!
Really nice. i will try this with my woobly wood lathe asap!
This is slick, thanks for sharing your solution!
This is excellent. I just balanced my lathe using this trick. Lifting one side and jamming something flexible under there is a great idea.
SUPER !! I'm glad this worked for you ! May not be perfect, but it works :)
Now you can possibly grease and oil the inner parts fully and or change out any old worn bearings internally to make below one thousand of a degree change if possible, some lathe machines require a oil change internally oiled drumed 🛢️... ⚖️
Yes... I have changed the oil on my lathe a few times. On this particular one, the oil is only for the gearbox, and the spindle bearings are oiled separately through fittings on the top of the lathe.
that is a real cool program and i bet could be adapted to several application that i can think of, but as far as i know my phone doesnt record in slow mo .
Slow motion was to make it more accurate and take less time. You can do this without the slow motion just by looking at the needle.
Big thanks, that really helped me in my DIY project!
That's great ! Thanks for the comment :)
Nicely done. So once your lathe is balanced, you could use the same setup to balance other things that you attach to the lathe. I have a mini-lathe and was trying to find a way to use it to balance some electric motor rotors I have made. Thanks.
Thanks for the comment. While what you are saying is true, the level of sensitivity is fairly low (with my application)
The percentage of weight imbalance needs to be substantial compared to the weight of the lathe rotating parts. With balancing a motor you are going to want to be within grams if not more accurate. The mass (inertia) of the your test machine will have a tendency to mute / filter out imbalances.
Ideally, you would build a floating / suspended spindle to attach your motor armature to. If your mini lathe is well suspended, and your motor is fairly large, then this could still be a good way to do it.
ONE LAST NOTE. Some one pointed out to me that this is technically not dynamic as it is only measuring one axis. My lathe was basically using the floor as a hinge and able to move back and forth slightly, while true dynamic balancing would allow it to move freely on each end, but this would also be many times harder to measure accurately.
thanks man
Wow that’s pretty neat.
Thanks. I'm kinda surprised it actually worked.
Wow, that is super cool. I ran into another video using this program. Do you think this would work if you first balanced the lathe then chuck something into it and balance the item that is chucked in the lathe ?
Also having the indicator on the face of the machine as you do vs. a shaft that is in the chuck ... either would work? Is one more accurate than the other ?
Great questions.
Putting something in the chuck to balance it... Yes and no. Yes, IF you are not trying to do sensitive balancing. The issue is that the mass of the lathe creates inertia / resistance of movement. If you have an object that is out of balance by a few grams, even if the lathe is floating, it will not move much.
The reason why this method works with the lathe chuck is because it was wildly out of balance. As it is, my chuck, showing "perfect" on my lathe, would surely be out by several grams on a more sensitive system. On a sensitive / accurate balancing system, the moving mass (of the machine) would be a small percent of the item being balanced.
If you were balancing a particular item, all of the time, you could make a tool that replaced the lathe and had freedom of movement. There are many ways to do this and it largely depends on your application, and how creative you are. I had an idea of suspending an electric motor from a heim joint, with an adapter to attach a flywheel. In this case, it would be important not to spin the flywheel too fast, as it would create gyroscopic stabilization.
The position of the dial indicator matters somewhat, but far from the chuck would amplify any reading and make it more accurate. Close to the chuck will tell you how much the chuck is moving, but that's not what you want to know. You want it as sensitive as possible. If I had a long bar from my lathe up to my shelf, for example, at the end of that bar, a few thousandths at the chuck would be an inch or so. Easier to read, easier to correct.
Thank you, do you know how it can be done by removing material?
Yes. If you watch both videos (part 1 and 2) you will see that I used the magnets to measure the position of where I needed to remove weight. I drilled holes to remove weight.
Hey Joel, what’s the name of the software?
The link is in the video description, under the video. I will also try to add it to this comment. www.emachineshop.com/dynamic-flywheel-balancing/
are you sure about puting magnets on the chuck?
That sounds quite dangerous.
You are right about that. These are very strong magnets and I was careful to keep the speed down. I stood back and tested it at higher speeds, off camera, to make sure it could take a lot more rpm before I trusted it. I can't remember if I said what the speed was but I think it was only 150 rpm as that worked best for the process and was safest.
This could potentially be dangerous if someone used the wrong magnets, or perhaps worse, strong magnets and turned it really fast.
@@JoelArseneaultCZcams those are very strong magnets, you could run it quite fast but i bet if they all slid to one spot you get a heck of a shake, lol.
@@johnwells6999 Yeah, for sure, it would get nasty.
The whole idea of this test is that the program calculates a temporary imbalance that you are able to move around. It takes this information and can calculate where the real excess material is. 👍
i tried the calculator but no matter what imbalance i put in the blue box when i hit the balance button everything goes to 0 and it moves the imbalance amount down one line it never tells me to move the weights
I have used it a few times and it works great... I would suggest starting over and following the steps carefully.
Everything returning to zero that would suggest that it is telling you to take all of the weights off at all 3 positions, meaning that it is best balanced with nothing on it. Your weights may be too heavy or because you need to allow your machine (whatever you are balancing) to move more freely, or use a more sensitive device to measure movement.
It’s a 30” x 1.750 small engine dyno flywheel. I have it set up with a indicator the same way you have your lathe with rubber under the side with the indicator on it. I’m getting .008 imbalance when I put that in the blue box it moves to the box below and everything else zeros out. This is on the 1st try with 5 in pocket #1. I’m wondering if the calculator just isn’t working correct right now I also put the same numbers in that you did they also give me zeros for everything
@@boostin306 Hmmmm. I just tried it, and I see what you are saying. There's something wrong with it for sure. That's unfortunate. You could try contacting them... Hopefully they can sort it out.
I was starting to think I was going crazy haha. I sent them a email if they reply I will let you know what they say.
@@boostin306 Yeah, sorry. I have used it several times without issue, so I also assumed you were crazy, lol... My bad.
what program you use ? where I can find it?
Link is in the description...
The online program. www.emachineshop.com/dynamic-...
@@JoelArseneaultCZcams thaks alot, I will try to make my own "soft bearing" balancing machine. thanks for inspiring me.
Looks like static balance to me not dynamic as you are only measuring in one plane
Hmmm. Really? What would you call this then ? I totally get what you are saying. Dynamic would be measuring forces on more that one plane where this is kinda only perpendicular to the axis.
Static would be when you juet allow the heavy spot to fall to the bottom / use the effects of gravity. I did a quick search and this is what I found.
Static balance refers to the ability of a stationary on object to its balance. This happens when the objects centre of gravity is on the axis of rotation. Whereas dynamic balance is the ability of an object to balance whilst in motion or when switching between positions.
When we balance rotating equipment rotors, mainly pump rotors a static balance is still measured and corrected by rotating the rotor exactly the same as dynamically balancing however when static balancing you are only measuring in one plane most often a radial imbalance. When dynamically balancing you are correcting radial and axial imbalance.
It’d be like adding a blob of putty to a bicycle wheel and spinning it. You’d get a radial imbalance which could be corrected by statically balancing the wheel (add a sufficient blob of putty to the opposite side)
If the wheel was buckled and had a blob of putty on one side it would not only be radial out of balance but would be axially out of balance and for this dynamic balance would measure and rectify that. (Adding a blob of putty opposite in this case wouldn’t rectify the buckled wheel so weight would have to be added strategically elsewhere to counteract the buckled section.)
Appreciate the website that produced the program online state it’s to dynamically balance.
Unfortunately the dti on the side of the headstock will only pick up radial readings.
However I’m not knocking the process as you produced positive proven results!
@@ryanb7609 Yeah... I didn't know how to put it into words, but I totally get what you are saying. I have balanced motorcycle wheels and you don't just balance a specific degree rotation, but also the left or right side of the wheel. Same deal with car wheels.
So dynamic balancing doesn't mean balanced in motion ... it is referring to testing and correcting that is done both radially and axially ? Maybe you're not this deep into the testing machines, but I'm curious as to how they work. Do they have a load cell close to the rotating mass to read radial forces and then another one at the end of a shaft to measure axial forces?
Maybe if I hang my lathe from a cable at the center of gravity and use two dial indicators 😂I know this wouldn't work as the torque would cause the lathe to rotate making it impossible. It would be a pretty funny sight up though.