How far away from the grinder wheel should tool rest be?

The tool rest on a grinder should be positioned close to the surface of the wheel, usually about 1/8 to 1/4 inch away. This distance allows for the tool to be properly supported during grinding but prevents it from getting too close to the wheel and causing damage or injury. The workpiece should also be positioned close to the tool rest, with a clearance of about 1/16 to 1/8 inch. This allows the tool to rest on the tool rest as the workpiece is moved past it.