|Forum topic by jsheaney||posted 07-26-2007 07:47 PM||14166 views||3 times favorited||22 replies|
07-26-2007 07:47 PM
I have Norton waterstones and the Norton flattening stone. I’m getting pretty good at sharpening my plane blades and chisels, but I’m very unhappy with the flattening stone. It doesn’t itself stay flat, which keeps messing with the geometry of my plane blades.
There weren’t really any instructions that came with the flattening stone. I started out just putting it in one hand and a waterstone in the other and just rubbed them together, as if I was rubbing my hands together. Unfortunately, this made the flattening stone concave, which made made by waterstones convex, which made my blades concave. Concave blades are bad. The corners dig into the workpiece.
At that point, I flattened the flattening stone with sandpaper taped to my tablesaw. That cleaned everything up.
I then watched the DVD that came with the system and carefully noted how the demonstrator used the flattening stone. He just set it on the table and gently moved the waterstones around on top of it. I’ve been doing that ever since.
Now, I’ve noticed that my flattening stone is convex, which means my waterstones are concave, which means my blades are convex. This is not as bad of a problem as before, but it’s still annoying.
When I talk about the stones being concave or convex, I mainly am referring to the length of the stones. I think what’s happening is that the lapping of the back of the blades (deburring) is where the geometry is being most affected. The relative size of the blades and the waterstones means that I turn the blades sideways and lap up and down the length of the waterstones. The width of the blades, therefore, is picking up the geometry of the length of the waterstones.
I suppose the answer here is to flatten my flattening stone again, but clearly I have to do that regularly. I don’t like that prospect. Plus, it’s already significantly worn down. And I want to spend less time sharpening, not more.
I’m looking for advice on keeping my waterstones flat. Maybe a diamond stone?
-- Disappointment is an empty box full of expectation.