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       CODE: 705.481-014 Buy the DOT:Download/CD-ROM
TITLE(s): LAPPER, HAND, TOOL (machine shop) alternate titles: lap hand, tool; precision lap hand
Laps metal objects, such as gauges and machine parts, to specifications within tolerances as fine
as 0.00001 inch, applying knowledge of abrasives and lapping procedures: Measures workpiece
with instrument, such as optical comparator, compares workpiece dimensions with specifications to
ascertain amount of stock to be removed, and estimates number of lapping strokes required. Mounts
workpiece in fixture, or in power-driven mechanism, using wrenches and keys, and positions work
aids, such as parallel bars and rods to guide motion of lap I or workpiece. Files grooves in
surface of lap to hold lapping compound. Applies compound to workpiece and rubs lap across
workpiece with rotary or reciprocating motion, feeling friction and applying required pressure based
on previous experience, to attain specified tolerance. Measures workpiece to verify conformance to
specifications, using special gauges. Straightens or polishes rods by inserting and pressing them
between two rollers with lapping compound.
GOE: 05.05.07 STRENGTH: L GED: R3 M3 L2 SVP: 5 DLU: 77
ONET CROSSWALK: 89111 Tool Grinders, Filers, Sharpeners, and Other Precision Grinders
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