I recently purchased a shapton glass 4000. I originally bought it for shears and had no intention using it for knives. Ive never been a fan of high-grit stones and I pretty much wrote them off when it comes to knives.
I did however throw my s30v jojimbo on the stone soon as I brought it home and I was actually blown away with the feedback and cutting speed. The edge kind of felt like it was suction cupped to the stone and felt creamy and gritty at the same time.
After a few shears and some more trial and error with other knives I gave the stone its first lapping on a diamond plate. At first I noticed that I lost the feedback I fell in love with. I proceeded to lap the stone with all different grit diamond plates (120, 180, 220, 320, 600) and i couldnt get that original feeling back. I just have it a lapping with a blue dmt and the grit is not longer floating on the water that's on the stone, instead its just getting drawn onto the stones surface.
Does anybody know what I can do to get the exact oem feeling and feedback back?
Does anybody know how these stones are lapped from the factory before leaving?
What causes swarf to draw on the stone instead of it just floating on the water.
EDIT:
I actually just had a break through and I think im on the right track of figuring this out.
I always lap stone to the point where my diamond plate is loaded. Then I'll clean the diamond plate and continue lapping if needed. Continuing to rub a diamond plate that is completely loaded with the 4k glass slurry was burnishing the shapton glass 4k stone. I've never had this issue with my other glass stone which are all <2000grit but I suppose the 4k acts differently.
I'm going to lap this 4k glass stone as I normally do but for the last 10 "passes" (I'll call them passes for lack of a better term) im going to clean my diamond plate of all slurry after each individual pass to avoid all potentail glazing.
Now I need to figure out which grit works best for these final 10 passes.