Pick up the scrap pieces. Throw away the small pieces and put the larger pieces under the storage bench or in a designed place. Shut the power off when you are finished or if you are leaving the machine, never leave the machine running unattended. Use extreme care that all lumber is free from nails, bolts, metal or loose knots before machining. Materials should never be fed into a machine faster than it will cut or sand.
Some jobs require a helper.
This requires great care on the part of both people. Never perform any operation unless you are entirely sure as to how to perform it properly and safely. Make use of a dry run or practice run. If you notice anything wrong with a machine or something goes wrong with a machine, shut it down and notify the instructor. Report any injury to your instructor immediately, if after hours report to the campus police.