How to Use a Bench Grinder to Sharpen Tools: Complete Guide
Match the wheel to the metal being sharpened - it is the right tool for the job rule that always applies. For old tools, you may want to go with a 60 grit aluminum oxide wheel and medium hardness. Put the tools in your oven - not too hot just set your oven to 350 degrees and let the tools sit inside for 2 hours. This treatment will help prevent cracking when being sharpened.