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ULTRA PRECISION REPEAT O METER
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- čas přidán 10. 04. 2018
- I needed a quick and dirty repeatometer for my surface plate lapping project. Then I realized it fit the requirements of the Spareroom toolmaking competition 2018 by Emma. So with a 20 minute limit I tried to capture all the fun.
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Support through Patreon / robrenz
I am "robinrenzetti" Instagram lots more content there!
Emmas competition entry playlist • THE TOOLMAKING COMPETI...
We always had a saying in the machine shop. If you cant make it right at least make it look good. Or better yet make it right and look good.
If your a machinist that does this for a living when your part goes to inspection if it looks good the inspector will always have a better attitude.
Or the converse of that he will find something to reject on a shoddy looking part. It only takes a little care and effort to make a good looking part.
Awesome instrument and video Robin!
Setting a new standard...accurate to a "renth"! Well done! 👏 💪 👍
Wait till Tom Lipton sees this thing! You will get a bazillion of his style points for the design elements and finish. I have tool maker envy all over again. Well Done sir.
Nice work and design as usually from a top notch craftsman.
Robin, the only thing I don’t see is your logo or manufacture signature on the tool you made.
I think your brand will be really appreciated over the time, as it is now, but without a way to prove the provenience would be hard to authenticate...
Thank you for sharing your knowledge and high end craftsmanship that inspire so many people.
Really nice repeatometer! As always enjoyed watching your video's. About a week ago I had a discussion with someone about people that introduce themselves as beeing "the expert" and how I dislike those people. I told my friend that a real expert doesn't have to explain he is, it shows by his work! After that I showed a couple of your video's and used you as an example. With this video you have proven it once again!
Thanks for the time and effort you put in the video and sharing your knowledge Robin!
Very nice work Robin. Looks like a tool that was made by a professional. Because it is.👌
Thanks for sharing. Your work always makes me want to step up my game.
My favorite part of this project is that your "quickie" project, would be, if completed by myself, the best thing by far I had ever done. Fantastic work.
9:35 "ahhh... there we go" So satisfying!
I'm into electronics, i know next to nothing about mechanical engineering. But your work, this level of precision always amazes me. You're awesome
thanks for the comments on finish and detail. and thans for entering the competition, its much appreciated.
The slotting and dovetailing trick is a true gem. Make your Bridgeport a mini-shaper. If you did not show that, I would be guessing for a long time how you pulled that off.
I am taking a metrology class now at 56 years of age I now have a greater understanding of what you do Can't wait for more tool building videos Thanks
Many style points on this one. I dare say you need some branding for these beautiful instruments you are creating lest we find rough copies on the Shars site in a couple of months. Bravo well done.
All the best,
Tom
I agree Tom. Seriously Robin needs to release his work with a CC-BY-NC license to at least give recourse to go after direct copies. creativecommons.org/licenses/by-nc/2.0/ Drawings on a blog or website would be good enough.
I was going to say the same. It would be really good to see a makers mark.
Thanks Tom, means a lot coming from you. I will work on the branding
ATB, Robin
This is an amazing tool, simple and deadly efficient...
All the othr entries on Emmas contest will curse you from this moment on... lol
Something I may seriously consider, as soon as both my parents stop requiring so much special attention, and, also all the other projects that are waiting in the queue... So much catching up since the last 3 to 4 months stall...
ATB, Pierre
You are doing what is really important! Seasons of life.
ATB, Robin
That is simply brilliant. You know, now I have no choice but to make one for myself. I hate it when people make me do things I did not plan to do. If I were you I would patent it.
That dovetail tool stole the show for me all the rest was just really really good! Thanks robin you never fail to entertain
CyclesInc
1 hour ago
I have three favorite CZcams channels on machining, because of intelligent approach, technique and experience. You are definitely one of them. Tom Lipton and Joe Pieczynski are the other two. I love to see all these qualities in action. You guys stand out from the rest. I like and watch a few other channels but not for the same reasons or experience.
Awesome video Robin! Would love to see you put together a video about slotting on the bridgeport.
Yes, more detail on the slotting operation. Tool grind, stepover, etc. Please!!!
I am not a machinist, but I play one in my garage. Every video of yours (and some of the other engineering/machining channels') I see adds to my list of things to try, build or buy. Thanks!
Beautiful work as always. Thank you for taking the time to share.
So much to learn from this design, wonderful work thank you Robin!
That is an elegant design Robin.
A significant amount
5 or 10 thousandths
Love it
Elegant simplicity at its finest. A true work of art. I love watching a true master craftsman at work.
Its 1.00 in the morning and Im up to watch your work. Still worth it 👍
I’ve never seen a nicer looking tool, actually a nicer looking thing, ever.
It looks futuristic
great design and build! cant wait for the next surface plate episode
Art: with a refined function. Beautiful.
Robin is so proud of his Chamfer Meister.
Looks great Robin, fit, form and function all brought together!
Really nice machine work as always Robin. Nifty work on the dovetail ~ Richard
Some of the comments use the word 'elegant' and I think that's one of the best ways to describe your work. I especially lovethe dovetail cutter! Thanks for sharing!
Great work Robin, outstanding design details.
I love these kind of one-shot designs with such simplicity!
Kudos! Love the simplicity.
And another exceptionally interesting part comes out of NASA's Jet Propulsion Laboratory ... I mean Robin's shop. Thanks for taking the time to edit and post.
Wonderful work Robin. Great video, I want to make one. Why, just because. Beautiful and simple.
When you are inspired by some great purpose, some extraordinary project, all of your thoughts break their bonds. Nice work repeat-o-master craftsman 🦉
Very nice Robin.
As a fellow EEVblogger, it was your Kelvin clips video a few years ago that tipped me over the edge and made my buy my first lathe, I think I was also inspired to buy and restore a Fluke 8840A. Thank you for that, never looked back.
Your workmanship is always inspiring to me, your attention to the finer details is amazing.
Thanks very much, that is great to hear! Thanks for watching and commenting
masterful as always, thanks for taking the time.
My first thought was that since the end effector has a flat ground in, when it swings on an uneven surface the flat section of the pin would no longer sit flush to the surface... Hopefully that sentence makes sense. Anyway I did a little "back of the envelope" on it and came up with this: if the distance from the center of the pin to the pivot is 5" (random guess) and the surface deviated by 0.001" (probably more than your intent) then the angle at travel is 0.0115°. The "error" between the center of the pin vs the contacting edge of the pin, if your flat is 0.25" (also a random guess) will be 0.000025", or 2.5%. This probably isn't enough to care about but does illustrate the advantage of round pins. An alternative would be to use a "double wishbone" type flexture that would cause the end effector to travel vertically rather than swing. It would displace the effector front-to-back slightly when raising and lowering, so the contacts to the plate and gage would need to be perfectly parallel. Either way love the project, it's simplicity, finish, and function. The accuracy is way beyond what I'm achieving. Big fan of your work!
Thanks Ryan, The spacing is 5.5" and I don't plan on anything above .000050" repeat reading. So that is 1.875 arc second and with a foot that is .094 wide that is 0.0000009" height difference between the two edges relative to the line formed by the other two feet when deflected 0.000050" But in reality the foot probably sits relatively flat to its resting spot since the surface is somewhat sinusoidal in nature not stepped. Thanks for watching and commenting.
That's what I was going to say but you beat me to it. Also you might have said it a little better ;o) Thanks for showing us mortals how it's done. I think even Dan Gelbart would be impressed. Now I've really got to get back to assembling that cheap bench drill I bought 5 years ago :D
You are solving a huge problem in the fine arts realm. Flatness.
Edit: thanks for showing how to make the tool. Your support is HUGE to industry at large
I was wondering how you cut that dovetail when you mentioned it, since it appeared blocked form spindle access. Nicely done with the shaper/mill trick! My G&L manual shows using shaper tools in a boring bar and planeing with the table.
I really enjoy your stuff, and I learn a lot. Thank you
Great video Robin. Tons of tips as always.
Very nice job! I have been wanting to get my hands on a Repeat-O-Meter for some time now - might be time to just make one!
Thanks Keith and thanks for stopping by. I really did just wanted a quick and dirty functional gage but this popped out in the process.
ATB, Robin
Excellent video always learn something watching I am just a hobby machinist thanks.
That is pure elegance, Robin. It has only the elements it needs to function, each in its simplest form, and not a thing more. Brilliant the way you carved it from a single piece of material. That and the attention you give to details elevates it from a kludged together one-time tool to a piece of art. Brain and eye candy.
Always a pleasure to look over your shoulder and hear you explanations. Thanks for sharing.
Nice tool Robin. Looking forward to seeing it in use.
Great build. We shared this video on our homemade tools forum this week 😎
Beautiful, Robin. Great work and attention to detail as always. It's funny how a great example of the art of simplicity can have so much detail to it. I mean, it looks very simplistic at a glance, but the lines following the angles of the indicator, the indicator mount being angled to have it sit at a pleasant angle, the edges put on the carbide feet, the corner-rounding, cable-tie bosses... Love it. I may have to try my hand at making one to work with my lowly tenths DTI until I can afford (and have the skill to make use of) an electronic indicator.
Elegant solution executed to perfection. A joyful experience for all of us. Many thanks!
Wonderful work, Robin. Thanks for sharing.
like the tips on the final touches, will definitely implement them
Oh God, I am so going to die before I reach this level, but what a marvelous quest! This piece is absolutely spectacular Robin, so much the better being "just a quick Repeat-o-Meter I threw together to protect the Renzetti-meter from rough exposure" :) Such a pleasure to watch and to walk through your thinking and process with you :)
Your a true precision master. Thanks again for sharing
Thanks for the construction footage! Very nice execution of a lovely tool cheers mate!
Great video, always so much to learn from you. Thank you for taking the time to make these videos and pass on your knowledge to all of us.
A superb design and masterful execution. If there was a mechanical arts equivalent of the Emmy Award your meter would be my choice for that award.
Paul
Sometimes making the tool to do the job is more fun than the job itself! That is a very nice build
Hi Robin, allways a plesure to watch your videos, nice your are not afraid to give your tips away, a good rounded of thumbs up, all the best.
If anyone doubts what you bring to the table when you design a solution to a mechanical problem, all one needs to do is look at the difference between Robin’s repeat-o-meter and the store bought variety (Tom Lipton did an excellent critique on the design). Beautiful piece of work, Robin.
Delicious tool making!
Beautiful elegant design !
Thank you for showing a shop made tool that is capable of extreme accuracy.
Fantastic design for a Repeatometer Robin. I love the simplicity and beauty of this tool. Thanks for sharing.
Again Robin, this is a most inspiring project. Your original thinking and ingenuity are truly outstanding! Your presentation of the engineering and science is excellent as well. Thank you for taking the time and effort to make these videos. The information is appreciated. PS if it is possible for you to dwell for a few moments on your chamfering machine it would be nice to see more of.
Your attention to detail is amazing. Thanks for another great video.
Very impressive! No doubt that extra time and effort to put a great finish on all surfaces makes a huge difference in appearance and perception of quality.
Excellent! Thanks for sharing.
Just incredible... thanks Robin!👍👍
GREAT VIDEO !!! FANTASTIC REPEAT-O-METER !!!
Nice project. The surfacing company we have come in uses the Rahn repeat-o-meter. They can be had for $1200 or so. Just mount a dial comparator indicator to it. It gets pricey when you go to purchase the electronic level kits for surface plates.
If the top of the line is the Renzometer, the lesser should be the Perfectometer. After all, perfect always comes 2nd to Renz.
There goes everyone else's chance in Emma's Competition, Darn it Robin!
Not so, you need to enter. You have no idea what the judges are looking for. I am trying to inspire, not discourage!
ATB, Robin
Impressive! This is the only way to describe this modern version of a repeat-o-meter. The basic consept can be used to make less accurate versions by those who do not need this level of accuracy, useing a test indicator. Fantastic! You can check your own surfaceplate for wear.
That tool is awesome Robin! I love the KISS system.
Steve
Thanks Steve, just following the inspirations from the Master Designer!
ATB, Robin
i just learned how to make a keyway with my mills quill when i was just watching this repeat-0-meter for edutainment.
Very nice overall, the one change I'd venture to suggest would be a slot in the edge for the cable to lie in with 3-4 1/8 push fit pins to hold it in place. that would give it a much more polished appearance.
Watching this makes me wonder if I could modify a beam load cell in a similar fashion as they have very similar flex to what you have made here. Fantastic quality or work and detail as always
Hello, sir...since you are designing with flexures, which is nice to see, adding one more flexure can provide an "amplifier" for the deflection, just in case a micro-inch was not enough ;-)
Was watching Tom Lipton Grinding the vise and saw this notification. I was like “we can watch this later....” LOL!
Poor Tom: stuck between This Old Tony and Robin Renzetti... actually, that's a pretty sweet spot!
Umm, not sure about this old tony...I used to like his videos, and he has a great way of explaining things for newbies, and the animation is great, but I just get bored of watching anything that's not Robrenz, Stegan G, Tom Lipton, Abom and Kieth fenner.
To each his own I guess... my list is identical to yours, except I traded Keith for Tony.
Fascinating. I do love the attention to detail.
Almost mesmerizing... a little like Clickspring or Stefan, but with a hypnotizing accent.
Renzetti the Mad Machinist!
One of the only creators I can watch a 45 plus min vid, others are Mr. Carlson’s Lab and The Signal Path. Awesome rebuild R R!
Beautiful work and an elegant solution. It seems every time I watch one of your videos I learn several subtle things that make sense once I think about them. Thank You for showing us and the explanations!
Brilliant! A *well* built tool! Thanks for the video.
Robin, have you ever NOT 'happened' to have a lap handy?? 😜
From just about anyone else "quick and dirty" and "sub-millionths precision" don't go together. You, Tom Lipton, Stefan Gotteswinter, maybe a few others. Normally "quick and dirty" means visible roughness.
Also I love turning lathes & mills into shapers on occasion. Not as easy as a shaper, but much cheaper and takes up a lot less space in the shop.
Function and purpose are obviously brilliant sir, but your commentary on aesthetics is much appreciated. I can't tell you how many times I see work that neglects finishing, and it just always comes across as lazy arrogance when total quality of a design is neglected. Great vid as usual Robin!
Thanks for sharing this elegant design. Your finishing tips will improve the quality of my work.
Excellent video Robin , thanks for sharing!! If you don’t mind, I will be building something similar .....
Outstanding, as always. Thank you for sharing this.
Oh boy tuff competition
thats just a piece of art. Mad respect
Holy crap, a work of art!
As always, you never fail to impress.... Once again thank you for the content and giving all of us some "considerations" to shoot for!!!! You are really an artist, looking forward to more in this project progression.
Great video,tool,and workmanship! I love my Roll In Saw ...Thanks again for the help!
I appreciate both the details and the clear explanations of the reasons for the details. Great tool and doable in many a shop. As for the LVDT I think I have to work out cobbling one together. Maybe a future video?
Thanks, just set up a email search notification on ebay for a B&S 599-981 indicator and a B&S 599-1020 or 599-1021 electronic amplifier.
I'm thinking LVDT and a digital read out. They are available in reasonable prices.
www.ebay.ca/itm/Keyence-GT-72AP-LVDTGauge-Sensor-Amplifier/322713120285?hash=item4b23336e1d:g:GXUAAOSwC6dZrZKd
www.ebay.ca/itm/Keyence-GT-H10-High-Precision-Contact-Sensor-LVDT/322713112268?hash=item4b23334ecc:g:Sw4AAOSwH1lZrZCu
Get you to 3 millionths in a cheap package.
Amazing stuff. I can't thank you enough for producing these videos.
Quick and dirty, I don't think so. I see that we agree on some of the important basics, it has to look good as well as to work the way it was intended.
I learned long ago, before CNC, that if a part looks, extremely good, it only needs to be checked to the inch, if it doesn't look that good, it gets checked to the smallest tolerance called for.
That's the basis for the old old saying: The motto of British craftsmanship used to be "H*** with the size, as long as she shines" and my old Norton MC was built true to that saying.
Your design is artistic and your execution is superb, keep up the good work and good luck, I'm enjoying it all.