A professional who tends one or more lapping machines to lap surfaces of metal objects to specifications, usually on production basis. Respnsibilities include:

• Starts machine and places workpieces in machine or engages automatic feeding mechanism.
• Measures lapped workpieces for conformance to specifications, using instruments, such as preset comparators and surface plate.
• May move controls to adjust lapping speeds, tool pressure, and length of machine cycle.
• May assist machine setter in setting up machine.
• May be required to have experience with particular material or product or with machine of particular type of trade name and be designated Barrel Lapper.