Gallery, Projects and General > Scraping

Lapping

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mm289:
 :scratch:sounds like scraping, just spelt differently :)

Wanted to lap in the bottom of some surface gauges and stuff, wondered what the approach was? Saw Pete do it on the course with some of the lapping powder Matthew brought and a surface plate...

What/where for the lapping powder, does it ruin the surface plate, could you use something else etc etc.

Any ideas?

Cheers,

Paul.

mattinker:
Paul,

What Pete used was diamond flour, on a surface plate. The plate will be impregnated with diamonds, You'd have to at least re-scrape to use for anything else. The other alternative is 3000 grit wet and dry paper on a surface plate. If you can completely cover a small surface plate with the wet and dry, you should be able to use it without wearing down the plate. (See Tom Lipton's video Reconditioning and calibrating a surface plate, the technician mentions this at one point)

Cheers, Matthew

awemawson:
To save your surface plate get your local glass shop to cut you a piece of their thickest plate glass and use that to back your wet and dry paper. You'll find the plate glass is plenty flat enough over the short distance we are talking about.

mattinker:

--- Quote from: mattinker on January 04, 2018, 09:58:09 PM ---Paul,

What Pete used was diamond flour, on a surface plate. The plate will be impregnated with diamonds, You'd have to at least re-scrape to use for anything else. The other alternative is 3000 grit wet and dry paper on a surface plate. If you can completely cover a small surface plate with the wet and dry, you should be able to use it without wearing down the plate. (See Tom Lipton's video Reconditioning and calibrating a surface plate, the technician mentions this at one point)

Cheers, Matthew

--- End quote ---

I forgot to say, use paraffin (Kerosene), white spirits, WD 40 or some thing light works better than dry!

Andrews plate  glass method works extremely well, but I thought that completely covering a small surface plate (which Paul has) was easy, the reason why surface plates are damaged by lapping with abrasive paper, is that the abrasive particles get between the paper and the plate, thus lapping the plate. The wet and dry completely covering (taped down) the plate will prevent the abrasive getting in contact with the precision surface.

mm289:
Cheers guys, was the diamond powder just an e-bay purchase Matt?

Thanks,

Paul.

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