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HEADSTOCK ELEVATION (Z-AXIS)
See Figure 3-1 for the Z-axis motor controls.
Figure 3-4 Z-axis locking levers
PM-940M 0-206 v.indd
TILTING THE HEADSTOCK
In routine operations the user relies on squareness of the
spindle relative to both axes of the table. Front-to-back
squareness set at the factory, and is not adjustable (by
Be sure to loosen
the Z-axis locks
everyday methods), but in the other plane the headstock
before moving the
can be set to any angle up to 90 degrees either side
headstock.
of the normal vertical position. [Because re-establishing
true vertical – tramming — on any mill is a time consum-
Remove the crank
ing process, most machinists look first for other ways of
handle before
handling the project instead of tilting the head.]
moving the head-
stock under power
The headstock is secured by three nuts spaced 20 de-
grees apart, one underneath and one either side, Fig-
ure 3-8. The headstock is top-heavy, and may swing
suddenly to either side unless a helper is on hand to
restrain it. Using a 24 mm wrench, testing for moveabil-
ity as you go, carefully loosen the nuts by degrees. Be
especially careful if the head has not been moved before
– the paint seal may let go without warning. (First-time
tilting may also call for unusual effort on the wrench.)
Figure 3-5
Z-axis hand crank
Set the headstock to the desired angle by reference to
the tilt scale, then re-tighten the nuts. Bear in mind that
this is good only to approximately ± 0.25
accurate means of angle measurement will be needed if
the project calls for precise tilting.
8
Figure 3-6 Z-axis limit switches
o
, so a more
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