ULTRA PRECISION REPEAT O METER
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- Опубліковано 1 жов 2024
- 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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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!
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.
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.
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!
Setting a new standard...accurate to a "renth"! Well done! 👏 💪 👍
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
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.
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
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.
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 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.
If the top of the line is the Renzometer, the lesser should be the Perfectometer. After all, perfect always comes 2nd to Renz.
Robin, have you ever NOT 'happened' to have a lap handy?? 😜
So much to learn from this design, wonderful work thank you Robin!
A significant amount
5 or 10 thousandths
Love it
CyclesInc
1 hour ago
I have three favorite UA-cam 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.
Beautiful work as always. Thank you for taking the time to share.
9:35 "ahhh... there we go" So satisfying!
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!!!
Wonderful work Robin. Great video, I want to make one. Why, just because. Beautiful and simple.
Really nice machine work as always Robin. Nifty work on the dovetail ~ Richard
For the smoothed edges in the flexure channels did you use a hand deburring tool, file, or ???? A tight space to work in!
Still interested in your champher mister tool. Is there an explanation of how you made it in the offing? I found some linear bearings and rods. Now I am waiting to see if they are sized right to use on the “V” table. If you have a drawing, even better (hint,hint).
Air tool and files on the flexure grooves. There will be a Chamfer meister video but I have to make an addition to it first.
Thanks for watching and commenting.
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.
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
thanks for the comments on finish and detail. and thans for entering the competition, its much appreciated.
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
Brilliant design, absolutely enjoyed the video. The extra mentioning of finishing and detailing the finished piece was very good.
I have two questions:
- Is the influence on the gagehead due to strain on the cable a result of some electric effect or is it just mechanical strain that flexed the gagehead itself?
- How is the large silicon nitride ball fixed to your DTI? Just glued on?
Thanks for sharing!
Thanks Stefan, the influence is mechanical. I have replaced all my original cables with with custom ultra flexible cable to minimize the effects. Triboelectric effects exist but are not an issue on these gages. The silicon nitride ball is 0.1875" diameter and is glued in a ball milled pocket. I roughed up the glue area of the ball with a very coarse diamond file. Your black super glue will work well.
ATB, Robin
Thank you! A 5mm siliconnitride ball sits in my shop for quite some time now, but I was not sure how to fix it to the stem. But thats sounds like a good end-of-the-day-project :)
the same here...
Between you and TOT (This Old Tony) Ill end up getting fired for watching youtube at the office!
FYI, Tony and Robin are not taking on sidekicks at the moment... if that's where you were heading with this.
😉
Looks great Robin, fit, form and function all brought together!
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.
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.
That dovetail tool stole the show for me all the rest was just really really good! Thanks robin you never fail to entertain
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!
Thats another work of art Robin, such a simple but effective design, loved the way youve ditched the nuts n bolts of the usual unit.
Are you planing to check straightness with it as you lap with a zero taken from a reference? Gota be quicker and less prone for error than the bubble levels.
Cheers D
Thanks Fred and yes it will speed up the whole process. The level is still very effective for determining a section that is straight enough to zero on.
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
great design and build! cant wait for the next surface plate episode
Great work Robin, outstanding design details.
Rob picking up girls: Hi, my name is Robrenz, Flat Robrenz. I came to stone and oil your ways, honey.
Kudos! Love the simplicity.
Excellent video always learn something watching I am just a hobby machinist thanks.
masterful as always, thanks for taking the time.
Your attention to detail is amazing. Thank you for sharing. I took particular note of the diamond wheel on your surface grinder. can they be used for general grinding? In the automotive industry many of the wheels were being replaced by diamond wheels around the time that I closed my shop.
R. Steven Lang, Shark River Machine
In general, no. Diamond dissolves in steel at high temperature. So you will quickly wear out an expensive wheel. Diamond is sometimes a good choice for non ferrous materials though.
Thanks Steve, Diamond is mainly good for carbide, stone or ceramics. CBN would be the choice for harder steels.
Thanks for watching and commenting.
ATB, Robin
Great video Robin. Tons of tips as always.
I really enjoy your stuff, and I learn a lot. Thank you
Robin is so proud of his Chamfer Meister.
Its 1.00 in the morning and Im up to watch your work. Still worth it 👍
Looks like work piece is wobbling when you are grinding the center carbide pin lol
Excellent video Robin , thanks for sharing!! If you don’t mind, I will be building something similar .....
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 ;-)
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
When you are inspired by some great purpose, some extraordinary project, all of your thoughts break their bonds. Nice work repeat-o-master craftsman 🦉
13:30 ears..... Bleeding.....
Beautiful result Robin. Am I right in thinking that you can use this to measure straightness,if you have a good reference plate to zero the gauge on? Can't wait for the next video
Correct
Quick & Dirty Repeat-O-Meter... reasonable for the circumstances! Just kidding... really nice job, beautiful!
That is an elegant design Robin.
Oh boy tuff competition
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!
Quick & dirty... Rude and crude...?!
Hey Rob, the adjectives you use to describe your work are no good.
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.
That tool is awesome Robin! I love the KISS system.
Steve
Thanks Steve, just following the inspirations from the Master Designer!
ATB, Robin
One word: AWESOME.
Please show us your chamfering machine.
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.
Thanks for the construction footage! Very nice execution of a lovely tool cheers mate!
Elegant simplicity at its finest. A true work of art. I love watching a true master craftsman at work.
Wonderful work, Robin. Thanks for sharing.
I’ve never seen a nicer looking tool, actually a nicer looking thing, ever.
It looks futuristic
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
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.
Care to share the CAD? I'm thinking of a WEDM project.
Just incredible... thanks Robin!👍👍
Great build. We shared this video on our homemade tools forum this week 😎
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.
I love these kind of one-shot designs with such simplicity!
Stefan definitely would have done it differently ……🤣😂
✌️💖&💡
Excellent! Thanks for sharing.
I can hear your smile, "It's nice having a tall mill like this..."
Thats a sexy tool
Elegant solution executed to perfection. A joyful experience for all of us. Many thanks!
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
Using flexure hinges reminds me of Dan Gelbart.
That means I am in good company :-)
Your a true precision master. Thanks again for sharing
i just learned how to make a keyway with my mills quill when i was just watching this repeat-0-meter for edutainment.
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.
Nice tool Robin. Looking forward to seeing it in use.
like the tips on the final touches, will definitely implement them
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.
Art: with a refined function. Beautiful.
GREAT VIDEO !!! FANTASTIC REPEAT-O-METER !!!
Your attention to detail is amazing. Thanks for another great video.
Brilliant! A *well* built tool! Thanks for the video.
Why are you not just running the indicator on the surface? Other than wearing out the tip, I don't see any reason for the front mechanism. I'm sure I'm missing something here. Very nice work. Also, thanks for the great unique tips on shaping etc. I will be incorporating those.
G Kuljian The small tip can fall into small chips and imperfections and give a false reading, especially when measuring such small degrees of flatness.
I believe the feet are equidistant. This would be hard to set up with a free moving indicator. I am not sure what all the benefits are of the constant relationship between the foot spacing. Tom Lipton did explain the functionality of the Rahn repetometer in one of his videos
As Rob mentioned, the feet with sharp edges push debris out of their way. Whereas the ball would ride over. I think that's what stroker's comment above was alluding to. It seems like you could just clean the thing before measuring, but it's such small deflections it wouldn't take much to mess up readings.
G Kuljian Yes, chips and infinitesimal craters would give false readings. The larger surface area of the foot spans those imperfections and scrapes away any dust particles to give more accurate measurements of overall flatness.
Nice video great points on product finish at the end . I think you have a marketable item there. Etched name and model in the side with a box . Just my thoughts.
Outstanding, as always. Thank you for sharing this.
VERY impressive!
Excellent video and exchange of valuable information!! Louis S.
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
Nice tool. I like your videos You could improve the tool by sloping the contact surface that the indicator point sits on about 40 degrees to be aligned with the axis of the lower flexure hinge point. Then mount the indicator to be parallel with the contact surface. This would give a mechanical advantage and about 30% more movement of the indicator point.
Thanks, glad you like the content. I understand your concept but the gage needs to measure the vertical rise of the hinged foot. It does not need any additional mechanical amplification since the indicator can read one micro inch per division on its lowest scale.
@@ROBRENZ Your tool is much better than others (including commercial versions) that I have seen. You are actually measuring the swing of the foot hinged on the lower flexure. If you swing a compass centred on the lower flexure hinge, from the moving foot to the indicator probe, you will see that the probe is not aligned to the movement of the compass. You have lost about 30%-40% sensitivity. It is still a good tool.
Delicious tool making!
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.
Great video, can you show us more of how the bandsaw works??
Its on the long list. Thanks for watching and commenting.
ROBRENZ i just brought a surface grinder because you video, am super excited to start making stuff. Thanks again