SIC grit size for lapping

[kelbro]

Which size grit works best for lapping stones?

How does the plate glass hold up? Several cycles? Few cycles?

Thanks.

 

[HeavyHanded]

I use 120 or 220 on most stones, 80 on hard vitreous stones that need a ton of work. Generally use a steel plate, tile rubbing stone, or a large hard Arkansas stone for a backer. I imagine float glass would last a very long time.

 

[kelbro]

Thanks!

 

[Dallas83]

I use glass from broken windows or pictures. Usually I take the coarse sic-stone to it first, to get some scratches. Then rinse off. Then the stone that's in need of reprofiling.

On a sidenote: don't use diamond plates on benchstones they tend to make the stone too smooth for further use. I spent hours to make them "bite" again on steel.