Tc 9-524 fundamentals of machine tools

SPECIAL OPERATIONS ON GRINDING MACHINES
CLEANING
the wire wheel is to be mounted is equipped with wheel
A wire wheel mounted to a utility grinding machine is used
guards and tool rests, these parts should be removed or swung
for cleaning operations such as removing rust, paint, or dirt
out of the way so that the objects to be cleaned can be brought
from metal objects. If the utility grinding machine on which
against the wheel without interference.
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TC 9-524
To clean objects with a wire wheel, place the object firmly
against the wire wheel. Work the object back and forth across
the face of the wheel until all traces of rust, paint, or dirt are
removed. Avoid excessive pressure against the face of the
wire wheel to prevent spreading the steel wires. Keep the
point of contact below the center of the wheel to avoid
kickback of the workpiece.
POLISHING, BUFFING, AND LAPPING
Polishing, buffing, and lapping are three closely related
methods for finishing metal parts. The three different methods
of finishing are listed below.
however, lapping is intended to produce very smooth, accurate
surfaces, and is never used instead of polishing or buffing
when clearance is the only consideration. Lapping is
accomplished by charging metal forms called laps with flour-
fine abrasives and then rubbing the workpiece with the lap.
The lap may be of any shape and may be designed to fit into
most power machine tools. The only requirements of the lap
are that it be of softer material than the material being lapped,
and that it be sufficiently porous to accept the imbedded
abrasive grain. Common materials for laps are soft cast iron,
copper, brass, and lead. Some laps are flat and others are
cylindrical to fit on steel arbors for internal lapping of bores.
A cutting oil is recommended for most lapping operations.