8.
Using a 1/8" hex wrench, remove the flat head screw that holds the Z-axis thrust collar to
the column. Remove the collar by lifting it up and off the Z-axis leadscrew. If the spacer
washer sticks to the bottom of it, remove it and reinstall it on the leadscrew shaft. Then
remove the ball bearing thrust and two washers from the collar and reinstall them in the
new Z-axis thrust collar in the same order. (See Figure 6 below.) Install the new collar on
the leadscrew shaft and secure it to the bed with the flat head screw.
FIGURE 6-Order of washers and bearing in Z-axis thrust collar.
9.
Install the larger Z-axis handwheel and encoder unit onto the Z-axis leadscrew. Lift up on
the saddle assembly until the washer and shoulder of the leadscrew are all the way up
against the bottom of the collar.Then push down on the handwheel and tighten its set
screw, being sure to tighten it against a new spot on the shaft. Install the pickup housing
over the handwheel unit as shown in Figures 4 and 5. When finished, the cable should
exit toward the left when viewed from the front.
Installing the RPM sensor
1.
Reinstall the headstock/motor/speed control onto the mill.
2.
Apply the 2-1/2" round decal to the pulley. A little liquid window cleaner on the pulley
allows the vinyl decal to be repositioned and bubbles squeezed out before it sticks. Once
the liquid is squeezed out and dries, the decal will stick fine.
3.
Locate the RPM sensor by holding it in the position shown in Figure 4. Mark the center
of the hole on the plastic belt housing and drill a 1/16" hole. Fasten the sensor to the belt
housing using the self-tapping screw provided. (Do not over-tighten or you can strip the
threads.) A plastic tie-wrap is provided to secure the sensor lead to the motor's power
cord to keep it out of the way.
