Thread: Why is this lapping taking sooo long???

The closer you get to lapping the stone flat the longer it takes to lap the higher areas down. This is because you have a flat area that gets larger as you remove material. It can take forever to reduce the whole surface enough to eliminate a rounded corner (as you know). I wouldn't worry about the corners. After you radius the long edges of the stone you will have a honing surface that is very slightly curved inward at the ends where you don't use it anyway.

On natural stones I'm alot mor forgiving on full area flatness. As jimmy pointed ou about checking the honing path to see if the area in question is a problem. Naturals are a limited item and once used up cannot be replaced, so I take a minimal amount of material off and learn to use what I can on that one stone. Synthetics I have no problem grinding away as someone will just make more...