Originally Posted by
Euclid440
So, a similar theory/argument has been going for years with convexing grinding stones to make it easier to grind a chisel or plane iron. Most folks use a straight ground wheel and don’t see where it is an issue or a benefit, just grind it.
A similar discussion about cambering a plane blade so the plane corners do not dig into the work. Folks have devised all manner of jigs and machined concave stones, sold for hundreds of dollars. But for hundreds of years Carpenters and Furniture makers have just done 10 extra laps with a finger pressure on one corner, then the other for a perfect camber, Bud-a bing.
The theory is all razors are warped, and if they are, few are warped enough to matter. The rolling X is designed to allow the heel of the concave side to fall off the stone and allow the middle of the razor to be honed by one inch of the edge of the stone. If they are warped, its not an 1/8 or 1/16, but thousands.