Hoffman Mechatronics
Bridgeport Mill J1 Rebuild
Note:
Be careful when removing the clutch cover not to lose the overload clutch lever spring or
plunger as illustrated in Figure 14 below.
Overload Clutch Lever
Spring & Plunger
Figure 14 - Overload Lever Plunger and Spring
The next part that needs to be removed is the worm gear assembly which contains the overload
clutch ring and the worm gear. This assembly is held in place by a small cir-clip as shown in
Figure 15 below. Once you have removed this cir-clip, the Pinion Shaft may be pushed out
towards the clock spring side. The worm gear assembly will then become free once the shaft has
been pushed through. Note that there is a spacer behind the worm gear assembly.
Cir-clip that holds the
worm gear in place.
Figure 15 - Overload Clutch Ring and Circlip
4.2.2 Quill Pinion Shaft Inspection
Inspect the Overload Clutch Worm Gear for any excessive wear on the teeth. If worn, this gear
may bind and cause problems when attempting to use the automatic quill feed. Check the clock
spring to ensure that there are no breaks in the spring that might affect the spring’s ability to
reduce the load on the quill.
A note here, if you are having problems where your quill constantly wants to fall down, this
section is vitally important to you. This is an indication that your clock spring is either broken or
out of adjustment. Check it carefully for breaks as they may not be readily visible.
BPJ1RBLD_002
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January 31, 201111
