TM 1-1500-204-23-8
Examine grinding wheels for defects prior to use.
Grinding
wheel
flanges
and
blotting
paper
compression washers shall be at least one- third
diameter of wheel. Flanges shall be the type which
provide a bearing surface only on the outer periphery.
The metal flanges must not contact the abrasive but
bear against blotting paper washers which in turn
contact the sides of the wheel. The inner flange shall
be fixed or pegged to spindle.
Stand to one side of grinding wheel when it is first
started to avoid injury in case wheel fractures.
When chatter occurs, stop grinder and determine
cause.
Do not exceed authorized speeds for particular
grinding wheels.
Wear suitable gloves, in addition to goggles, when
buffing.
c.
Lathes. Lathes are used in working metal of a
cylindrical nature, and can perform either inside or outside
work. The material is secured in the lathe chuck to
provide rotary movement, then formed by contact with a
stationary grinding or cutting tool. Do not machine
magnesium at high speed or with a heavy feed. The
following safety precautions shall be followed when using
lathes:
Cutting tools must be kept sharp.
Allow chuck to come to a stop on its own accord. Do
not use hand pressure to stop a spinning chuck.
Do not file work while back gears are engaged,
because spindle speed is too slow to keep work
steady. Work will not stall if jamming occurs.
Do not set tools while lathe or power is on. Examine
tools and chucks for cracks and defects prior to use.
Do not measure work while machine is in motion.
d.
Milling Machines
Use
milling
machines
for
shaping or dressing, cutting gear teeth, keyway slotting,
splining, and similar work. These machines may be used
for general purposes as well as special cutting operations.
The following safety precautions shall be followed when
using milling machines:
Ensure that bed and work are clean prior to securing
work to bed.
Secure work to prevent movement during all phases
of milling.
Before setting up job, ensure that table, bore in
spindle, arbor or cutter shank, and work is clean and
free of chips, nicks, and burrs.
Select a cutter of proper diameter.
Do not change feed or speed while work is being cut.
Lower table or raise spindle prior to moving or feeding
work under a revolving cutter.
Ensure that all clamps and bolts are low enough to
pass under arbor and cutter.
e.
Shapers and Planers. Shapers and planers have
a reciprocating, single-edge cutting tool, and are used for
straight-line machining, surfacing, and similar work. The
following safety precautions shall be followed when using
shapers and planers:
Be sure that work is tightly bolted to table or firmly
held in vise and cutter raised above work before
starting machine.
Be sure that ram has adequate clearance before
starting machine.
Personnel operating shaper shall wear
goggles.
Stop machine completely when changing tools.
f. Miscellaneous Machine Tools. Refer to the applicable
machine
maintenance
manual
for
specific
safety
precautions.
2-3
