Stone Surface Grinder

scott kozub

scott kozub

Joined
Jan 1, 2018
Messages
861
I recently picked up a surface grinder for a steel. I haven't been using it because I keep warping my blades. I think the blades are heating up and swelling causing more heat and then a warp. I'm not running coolant. I've tried very shallow passes and small bites. I've been thinking about doing a belt conversion on it but am curious if I should try something else. Maybe a fish pump with coolant?
 
What grit and how often do you face your stone?
Also make sure you have a good stone,I use a 46 grit Norton seeded gel stone.
finer grit stones load up faster and generate more heat.
 
Turn the blank over more frequently to keep the stresses even. Ornery pieces, I do 5tenths or less passes, turning frequently. Even on happy steel, I rarely cut more than 1thou. 0.0002 and quarter turn advances to finish. No cooling, unfortunately. :(

Good advice there in Stan's question!!
 
Sometimes you need to reduce your step over and increase your feed rate. If you dress your wheel and take a reasonable depth of cut you should be able to find a step over and feed rate that doesn't distort your work. It may only be a small fraction of the width of the wheel. Don't try to do anything close to the full width in one pass. Depth is usually .001 or less.
 
Thanks for the tips guys.

I tried my coarsest stones and dresses them before using them. I was taking depths at 0.001 so maybe I'll try less
 
Good luck, Scott. Doing no-coolant manual surface grinding of blade-thin stock is always a PITA. It's nice to have stuff flat and parallel, though, so...
 
Make sure they're not warped before you SG. The magnet will flatten out the blade and your faces might be parallel but upon release it will go back to its original bend.
 
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