Thread: Norton Lapping Problem

The regular practice here is DMT to lap the stones. Personally, I'm not a big fan of that. I prefer to have this

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So you can have enough surface area to do a proper lapping. All you have to do is then go buy sandpaper kit from Advanced Auto ($5 3M brand, 220 to 1000 grit).

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Wet the granite, put paper on top, wet the paper, then wet sand the stone with figure 8. To answer your question, it'll probably be a good idea to make both sides parallel. So sand off the higher side, then figure 8 lap it. Use 220 or lower so it's fast cutting. Rinse often....better yet, do it under a running faucet. It'll cut faster. DO NOT APPLY PRESSURE....let the speed do the work....you should not be applying downward pressure. Then work up the grit to the surface smoothness you want.

What would cause it? I can probably tell you that it's probably you. DMT is about the same size as the Norton....it can easily roll off edges.....plus your holding DMT in one hand and Norton in the other - 2 moving stone for perfect flatness won't work well unless you are very experienced.