My slow speed diamond disc lapping machine, the beginning

Janderso

Jeff Anderson
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I have all the materials.
The idea is to mount this 90 RPM drive motor on the 1/2” aluminum plate. There will be an 8” lapping disc that will register on a hub on the wheel. Magnets will hold the disc to the plate.
An adjustable tilt platen will allow for precise angles to grind high speed tool, carbide blades for scraping or brazed carbide cutting tools.
The discs come in grits from 250 to 2,000 grit as far as I know.
There will be an off switch and a forward and reverse switch.
I found the motor after a long search on EBay. It’s new, made in The States and I paid less than $160 delivered, I think. The keyed shaft is 5/8”. I already made the arbor flange to mount the main wheel.
Concentricity is the main focus. I think I have a good plan. We’ll see.
Thank you, Ulma Doc, aka Mike Walton and Donald Yungling for the inspiration.
I’ll post as I make progress.
I made a little progress today.
Sammy, the dog, decided to chew up some sprinkler lines. That took up some time.
 

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Last edited:

f350ca

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You'll end up using it a lot. I made one a while back using his magnet fixing idea. I bought 5 inch disks from China and run it about 300 rpm. I keep the disk wet with kerosine or it plugs up quick, but will wash off again with kerosine. Have heard of using window cleaner as a lube as well.
Moulded inserts sharpened back to the top of the edge radius will skim a thou off as easily as a sharpe HSS cutter.

Greg
 

Weldingrod1

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Oct 14, 2013
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Key trick: Recess the magnets! I had to re-set mine!

Sent from my SM-G892A using Tapatalk
 

Z2V

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Looking forward to you progress updates
 

savarin

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Have you looked at a gem faceting machine?
Thet have a flat slow platen with an indexable arm to hold the stone, its rotation is indexed and the angle is variable.
It may give some ideas.
 

Janderso

Jeff Anderson
H-M Platinum Supporter
Joined
Mar 26, 2018
Messages
5,743
Have you looked at a gem faceting machine?
Thet have a flat slow platen with an indexable arm to hold the stone, its rotation is indexed and the angle is variable.
It may give some ideas.
I’ll check it out
 

f350ca

H-M Supporter - Silver Member
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Dec 15, 2018
Messages
488
Careful glueing in the magnets, I used epoxy and it must have expanded. Had to grind the magnets down to get them flush.
Greg
 
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