Thread: Flattening stone:3 1000 stones vs diamond plate

Originally Posted by PhatMan

Sharpman,

I think you might have to be careful.

(From my experience of making telescope mirrors) - you start out with two (2) plane discs of glass. By use of abrasive and rubbing motions against each other, one disc evenutally becomes convex, the other concave.

Could this happen in the case of hones rubbed against each other, particularly if the hardness of the two hones were similar ?

Have fun !

Best regards

Russ

Russ, very good point.

That is why I said you need at least 3 stones. Using two stones
causes one being convex and one being concave. This way, they
fit in each other.

The only way 3 stones fit in each other is only possible if they
are flat. That is why rubbing 3 stones in a particular order
does not cause concavitity/convexity, but perfect flattness.

You do need to make sure the stones are not convex, because
this causes rocking.

Check this link for more info:

Making Accurate Straight-Edges from Scratch

Sharpman