Tormach PCNC 440 - 9.3.5 Geometry Adjustment of Precision Mating Surfaces; 9.4 Spindle Bearing Adjustment; 9.5 Transporting the Mill

Chapter 9
167
UM10372_PCNC440_Manual_0221A
MAiNTENANCE
The Adjustment Nut is located on the back of each stepper motor (see Figure 9.4).
1. Mark the current posion of the adjustment nut on the back of the stepper motor.
2. Measure the lost moon in the axis. For more informaon, refer to How to Measure Lost
Moon secon earlier in this chapter.
3. Using a pin spanner wrench, turn the adjustment nut clockwise about 10˚ and measure
the lost moon in the axis again. If the lost moon value decreases, adjust another 10° and
re-measure. Repeat this step unl the lost moon value does not decrease from your changes.
IMPORTANT! Do not overghten the adjustment nut; this can cause the stepper motors to stall or may
damage the bearings and the motor.
9.3.5 Geometry Adjustment of Precision Mating Surfaces
All precision mang surfaces are pinned together with tapered dowels during assembly at the
factory. The pinned connecon ensures that factory alignment is maintained in the event of a tool
crash. Each dowel pin has a small metric threaded hole in the center that can be used to extract the
dowel should it be required for disassembly.
Under typical usage, no adjustment of pinned connecons should be necessary. In the event of a
hard crash, shims can be used to make minor alignment adjustments between pinned components.
Small adjustments (less than .010”) will generally not require a full disassembly of the pinned
connecon. In these cases, the alignment dowels can be le in place, and the shims can be inserted
into a small opening created by loosening the bolted connecons.
9.4 Spindle Bearing Adjustment
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 aempt to adjust spindle bearing preload. Failure to do so will adversely impact
spindle balance.
9.5 Transporting the Mill
Follow these steps when preparing the mill for transport to a new locaon:
1. Place a solid block of wood on the table underneath the spindle and lower the Z-axis so that
the wood is slightly compressed.
2. Apply a light mist of water repellent oil, such as WD-40, to all exposed bare metal surfaces
before moving the mill to protect against corrosion.
3. Remove the PCNC 440 from the stand and secure to a shipping pallet for vehicle transport.