Thread: Why lapping film rules

Originally Posted by Bart

I like your approach and lapping film is waiting in my desk to give it a try.

For the sake of having correct figures for prosperity...
hardened steel is not 7.5 Mohs, according to my sources: eFunda: Convert Hardness: Rockwell C-Scale
On the Rockwell C scale, which is what's generally used for cutlery, HRC 64 = 6 mohs. HRC 58 = 5 mohs. Both are exponential scales, so the differences between one point and the next are rather huge.

One thing that's not clear to me: how do I keep the film from not moving around when the sheet of paper sits between the tile and the film. I understand that the film sticks to the tile with a bit of water (air bubbles to be avoided). But how do I keep it stuck with the paper sheet in between?

Thanks,
Bart.

Thanks for the Mohs clarification. I had simply found "hardened tool steel" or something listed as Mohs 7.5, and thought that would describe razor steel.


You use the paper by first putting water on your honing substrate, lay down the paper, let it absorb the water, be sure to remove all wrinkles, then lay down the film on top of the wetted out paper. It sticks even more solidly than just the film on the substrate directly.



P.S.--as an aside, it turns out I haven't even used lapping film the last couple of months. I've been using DMT plates (600, 1200, 8000) finishing on ChromOx.

I have to re-order some diamond film!