A professional who tends pair of semiautomatic cylindrical grinders that grind typewriter and adding machine rubber platens and feed rollers to specified diameter and finish. Responsibilities include:

• Mounts platen between driving head and tailstock and trips lever causing carriage to bear platen against and across grinding wheel for coarse grind and rough finish.
• Removes platen, mounts it in second machine equipped with finer grit wheel, and grinds platen to specified diameter and desired finish.
• Examines finished platen for smoothness and for defects in rubber, such as scratches, graining, or holes.
• Measures platen for conformance to specified diameter, using c-gage.
• May tend double-bladed cutting device to trim excess rubber from ends of platen.
• May tend machine that grinds and finishes platens and rollers in single operation.