TM 9-3417-213-14 & P
INSTRUCTION MANUAL
N. PROPER WAY TO CHECK FOR POSSIBLE LOOSENESS OF QUILL IN HEAD CASTING
AND FOR LOOSENESS OF SPINDLE IN QUILL HOUSING
Once in a while there is a complaint on what appears to be looseness in the head and or quill assembly.
In 99% of these cases this is caused by loose gibs and has nothing to do with the fit of the spindle and quill in the
head casting.
However, in the event that a check is to be made, it should be done as in Figure 1, Position 1 & 9 with the
indicator base mounted solidly on the head itself.
If a reasonable amount of force is applied to the, spindle, a reading of up to .0005 is not out of line, with the Quill
retracted.
X.
RECOMMENDED SPEEDS FOR HIGH SPEED FAST SPIRAL END MILLS:
TOOL STEEL
MACHINE STEEL
CAST IRON AND
SIZE
AND
C.R. STEEL
FREE CUTTING
FORGINGS
STEEL
1/8"
1675
2850
2850
3/16"
1000
1675
1675
1/4"
1000
1000
1675
5/16"
600
1000
1000
3/8"
600
600
1000
7/16"
600
600
600
1/2"
355
600
600
5/8"
355
355
600
3/4"
355
355
600
7/8"
210
355
355
1"
210
355
355
The foregoing should be regarded as approximate, as many factors control the efficient operation of end mills. Always
keep cutters sharp, and a steady flow of oil or compound directly on the working point will allow much higher cutting
speed. Keep rate of feed consistent with finish required.
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