Thread: Lapping a new stone...

I am watching Glen's video about lapping a brand new Norton 4/8 and I am confused..

In his video he uses a DMT 100 to do the initial lap then finishes on the 325, I thought the idea was to get it flat and smooth and you could do that with a 325 only, My norton's are brand new and I have a DMT 325 on order..

So can I use the 325 only or do I need to get some weird sandpaper to do this (or buy the expensive DMT 100)

*confused

The 325 is all you need.

Whew thanks I was getting nervous

Did I read somewhere that the grit that you lapped the stone with determined it's use. The smoother the lapping material the less cutting action the stone would have???

+1. The 325 will get it flat, and keep it flat.

The 100 would just make quicker work of it if there was a lot of material needing to be removed.

Originally Posted by bulldog

The 100 would just make quicker work of it if there was a lot of material needing to be removed.

Give that man a Cigar

BTW gents it is a 120 grit or XXC DMT and you really should not need one, I bought one for the express reason of lapping old barber's hones off e-bay and fixing them up for resale... Since I bought one I try and use it LOL

Here is the DMT Grit Chart


SILVER (XX) Diamond - Extra-Extra Coarse (120 mesh, 120 micron)


BLACK (X) Diamond - Extra Coarse (220 mesh, 60 mircron)


BLUE (C) Diamond - Coarse (325 mesh, 45 micron)


RED (F) Diamond - Fine (600 mesh, 25 micron)


GREEN (E) Diamond - Extra Fine (1200 mesh, 9 micron)


WHITE (CER) Ceramic (2200 mesh, 7 micron)


TAN (EE) Diamond - Extra-Extra Fine (8000 mesh, 3 micron)