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DIY Precision Lapping Plates from Scrap
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- เผยแพร่เมื่อ 10 มี.ค. 2023
- In this video, I show how I used the Whitworth three-plate method to turn scrap cast iron from a damaged milling machine column into high-quality lapping plates. The Whitworth method is a proven technique for producing flat, parallel surfaces, making it an ideal method for creating lapping plates.
Special thanks go to Tom Lipton @oxtoolco for inspiring this project and for sharing his knowledge and expertise in the field of machining.
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Nice work! Made my own set based off the videos by Tom Lipton as well. Fun project!
very much like grinding a telescope mirror
Noice, you make it look so easy :)
Thanks! The tricky part was staying focussed for 6-7 hours while rubbing bits of metal together!
If you had to do more...
Look at an orbital sander, a drill press... and combine the two.
Ie, gyrations whilst rotating, hang a weight on the arm and swap plates every half hour or so...
I think that's a really interesting idea! I'm curious if anyone has tried it before with the three plate method. Not sure I'd want to make any more plates manually, but I have to admit that it was somewhat therapeutic, at least for the first hour or so!
Its the way they do them industrially. The machines slightlier fancier but the same basic principle.
Great work!! I also made a 3d printed spherometer for my lapping plates but I feel like it sags to much to fully trust it. More testing requited.
Thanks! Yeah, if it was something I used often, I'd definitely make one from metal.
your livecenter/tailstock isnt very rigid, you can see it wobbel at minute 1.25 ?
cheers ben.
Think it was all just lined up a bit wonky - really it's a decent lathe for its size 👍
Nice! I haven't got the patience to do that😂
Thanks Olly! It's kind of therapeutic, at least for the first hour or so...
Nice work . What are you going to use them for or how do you use them.
Thanks! That's a good question, I've got some carbide tooling that I might be able to sharpen with them. Believe you just put some abrasive slurry on, then start lapping. My main reason for making them was to have a go at the three plate method, to make a flat surface without a reference.
@@PaulsGarageProjects No channels then for sharpening carbide. Hammer the diamond into the disk and wash well the still loose particles - you want none of those ridding over the cutting edge and buggering it up. The beast ( most aggressive ) lubricant is gasoline, followed by kerosense followed by diesel.
For the lapping process, I wonder if you couldn't have centered a strong magnet on one & then hooked it up to your drill or something haha. I guess, that might not actually produce an "even" surface since it would be the same surfaces always in contact via rotation.
I have a feeling that that would produce convex surfaces. The reason being that the outer part of the disc would be travelling further than the centre, removing more material.
In fact, you do spin the plates together as part of the three plate method, to bring down the outer edge a bit. The centre is always in contact during the standard rubbing, which removes more from it.
That would be not that far from how a conditioning ring is used to "revive" a worn out plate. Good call ! Basically, sort of an orbital sander. With the stroke, orbit and rpm well chosen this will produce flatness better than a tenth of a micron in 10" . Which is actually not that great...
This is interesting. Why is it shiny? Normally, you should get a dull grey color no matter the grit size of the diamond. The cast iron must be of weird quality (mythical chinesium) that it enables the diamond particles to "scratch" instead of "tumble".
Good question! I was surprised to see it come up to a mirror finish myself. At a guess I'd say it's just your common, cheap gray cast iron.
@@PaulsGarageProjects i'm quite certain that all the plates have diamond strongly imbedded in them.. the cast iron was so freakishly soft, that it got embedded. To try if the diamond is embedded get a piece of hardened steel (parallel, old gauge block etc) and rub it on the plate.. if you see alterations you know what you've got :)
There are definitely diamond particles embedded in the plates - I've been keeping them separate for the different grades of lapping compounds.
I'm not convinced that it's the diamond that's making the cast iron shiny though, have a look at the finish people get in cast iron frying pans - they look like mirrors!
@@PaulsGarageProjects I have never made that claim. I have made the claim, that embedded diamonds create microscraches that look make the surface shiny (it's the scratches). I lapped cast iron (with cast iron) many times with various diamond sizes and it always came out matte. Please look at Stahli's (german lapping machine producer) and it's there explained with great footage and animations. th-cam.com/video/fnoVV-RWIWY/w-d-xo.html