slack grinding

ScottRoush

ScottRoush

Joined
Jan 10, 2010
Messages
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Can anybody tell me what you can do with slack grinding versus using a platen?


And:

I just put the ceramic on the platen for my Craftsman 2x42... but is there anyway you can modify for hollow grinding??
 
I use the slack belt attachment on my kmg mainly for handle shaping. It's great for the transitional area between guard and handle.
 
For me, it's the same as Mike. I use the slack belt for shaping handles. You can't get the same smooth organic curve for a handle scale off of a platen that you can on a slack belt. I also use the slack belt for convexing down to the edge for larger flat grind blades, for sharpening, and for grinding full or partial convex grinds, of course.

--nathan
 
Yeah... my platen is removable for contour sanding wood and I plan to do that. But, somewhere, and I can't find it now... I found a reference to some bladesmith instructor recommending the use of slack grinding blades. It's a fuzzy memory so maybe I had it wrong....
 
As far as hollow grinding, you need a contact wheel, or make a platen that instead of being flat, it has the contour of a partial circle, say 8 inch or 10 inch, and cover it with graphite platen liner, I saw this in Blade magizine years ago, they used a piece of hard wood to make the half circle of. Never tried it so I don't know if it would work.
 
Grinding a blade on a slack belt will give you a convex grind (the opposite of a hollow grind). Alot of makers use a convex grind for the primary grind.
 
I guess that makes sense. Well... my grinds are convex right now whether I want it or not. I'm still trying to master the flat grind as it is.
 
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