DaveW,
I'm not sure of the grit # but find a grinding wheel with the finest
grit you can,and at my shop I use one wheel on my grinder for tungsten ONLY,this helps to keep contaminates from getting embedded in your tungsten which can transfer to your weld puddle.I also use a cordless drill to hold my tungsten against the wheel to give an even "sharpen".Keep us posted on how it goes!!
Mike
MACH 4 Welding
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