Choose the right size
Disc diameter affects cutting depth, tool bulk, and accessory availability. Use only accessories approved for the grinder’s size and rated at or above its no-load speed. Never defeat a guard to fit an incorrect wheel.
Corded or cordless
Cordless grinders are convenient for field repairs and short tasks. Grinding under sustained load consumes batteries quickly, so repetitive fabrication can favor corded power. Compare the cordless tool with the recommended battery attached.
Switch and control features
Paddle switches stop when released and suit work where immediate shutdown matters. Slide switches may be convenient for longer runs. Electronic brakes, anti-kickback clutches, soft start, restart protection, and tool-free guard adjustment add meaningful control.
Match the accessory to the task
Cutoff wheels, grinding wheels, flap discs, wire brushes, and diamond products behave differently. Check material compatibility, mounting instructions, guard requirements, maximum speed, and expiration or damage before use. A grinding wheel should not be used as a cutoff wheel.
Safety is part of the purchase
Budget for the correct guard, side handle, eye and face protection, hearing protection, and dust controls. Position sparks away from fuel, batteries, glass, people, and combustible material. Inspect every wheel before installing it.