High-speed power grinders are one of the most common sharpening tools found in woodworking shops and studios. They are relatively inexpensive, easy to find, and versatile. But sharpening your tools (including plane blades, gouges, and chisels) with this type of grinder comes with a caution. Make sure you don’t overheat the metal. Overheating tool steel will cause it to loose temper, and can destroy or damage your tool. Poorly maintained cutting wheels can contribute to overheating.
In this quick video segment, I will show you how to square up, flatten and de-glaze your grinding wheel with a carborundum stick or diamond embedded dressing/cleaning tool. (1.5 Minute Video)
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In case anyone isn’t aware… never grind aluminum on this type of grinding wheel. Supposedly, the wheel will eventually break apart at speed. I’ve never actually heard of an incident, but have been warned about it many times. I think the aluminum melts into the pores of the wheel, then expands and contracts as it heats and cools, causing the wheel to crack. At 3500 rpm, it’s going about 60 mph.. I wouldn’t want to take any chances