Thin wheels like we use on the chain grinders - sometimes come out of balance or center not true ( new out of packaging) and/or not flat. they can shatter due to vibration when spinning up to speed. Thicker wheels are simple enough to balance . Runout can be a little dicy to correct. 50 years of playing with machine tools, appendages still all intact- a little banged up here and there though. never stand /sit directly in front of grinder when starting up.( for that matter any thing that is going to start spinning at a fair rate of speed)
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