Chapter 9
170
UM10349_PCNC1100_Manual_0916A
Maintenance
9.4 Spindle Bearing Adjustment
PCNC 1100 only
When correctly adjusted for preload, sustained high spindle speed will bring the spindle bearings to
about 155°F (68°C). This is a normal condion. Higher preload in the spindle bearings will result in
even higher temperatures and excessive wear.
NOTE: For informaon on rebuilding PCNC 1100 spindle cartridges, refer to Tormach service bullen PCNC
1100 Spindle Rebuild.
PCNC 770 only
During operaon, sustained high spindle speed will bring the spindle bearings to about 155°F (68°C).
This is a normal condion. Spindle bearing preload is set at the factory and is not operator-adjustable
IMPORTANT! Do not aîž©empt to adjust spindle bearing preload on PCNC 770 spindles. Failure to do so will
adversely impact spindle balance.
9.5 Spindle Calibration
To improve spindle speed accuracy, calibrate the speed control signal. This procedure is not necessary
for mill operaon.
This procedure requires access to the electrical cabinet while the mill is powered on.
CAUTION! Electric Shock Risk: Points within the electrical cabinet contain high voltage. Do not make
contact with any part of electrical cabinet unless specically instructed to do so. Failure to do so could
result in serious injury.
1. In the PathPilot interface, toggle the spindle belt posion by clicking Spindle Range unl the
LED light is illuminated next to LO.
IMPORTANT! Ensure the spindle belt is in the low posion. A mismatch between the spindle range buon
in PathPilot and the actual spindle belt posion will result in the commanded speed being dierent from
the indicated RPMs.
2. Set S-word to 500 either by typing S500 in the MDI line and pressing Enter or by typing the
value into the S DRO and pressing Enter.
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