Thread: using a coarse stone to lap a finer one works because ...?

I beleive a coarser grit stone is used to establish flatness. Reason being is that it will be much faster than a finer grit stone. After that, there are two things that can happen.

1) You can use it as is. The random patterning of the DMT should prevent any grooving in your finer hone stone and as long as you did not have any larger particles get in while lapping you should still be at the same grit as you were before.

2) You can them procede to lapp your now flat stone with finer grit items (wet/dry sandpaper, higher grade DMTs, or whatever) to establish a extremely falt and smooth surface.


That being said, I haven't lapped a honing stone to date, and this is based on my limited knowledge from reading. Hopefully someone with a bit more know how will chime in.

Matt