Jet JTM-1050 Operating Instructions And Parts Manual

Also see for JTM-1050: Operator's manual

193. Lower quill to fullest extent.4. Remove two lower screws from variable speedhousing (A, Figure 21).5. Remove six screws (B).6. Remove top assembly (C) and tap to cleardowels.7. Replace timing belt.8. Reverse procedure to reassemble.Figure 20: Timing belt replacement13.6 Drive belt replacementRefer to Figure 21.1. Disconnect machine from power source.2. Remove motor.3. Remove three screws (A, Figure 21). Threadthe screws into the adjacent tapped holes andback off the cover (B).Figure 21: Drive belt replacement4. Remove two screws and bushings (C) fromtilting plate.5. Remove four screws (D) and one screw (E).6. Remove four screws from variable speedhousing (F).7. Remove top housing (G) and tap to cleardowels.8. Replace belt.13.7 Brake shoe replacementRefer to Figure 22.1. Disconnect machine from power source.2. Remove top section.3. Remove two screws (A, Figure 22).4. Remove clutch hub assembly (B/D).5. Replace brake shoes (C).Figure 22: Brake shoe replacement13.8 Leadscrew backlash adjustmentThe milling machine table is moved by a leadscrewand nut for each machine axis. For properoperation, there must be clearance betweenleadscrew and nut, which results in backlash. Asecond feed screw nut is provided to eliminatemost of the backlash. The following proceduresprovide instructions for obtaining acceptablebacklash.13.8.1 Cross feed backlashRefer to Figure 23.1. Use cross feed crank to move table to extremerear of its travel (toward column).2. Remove pleated way cover.3. Open the two chip guards (#61/62, sect.14.3.1) enough to expose cross feedadjustment nut (the nut toward rear of feed nutbracket is not adjustable; only front nut isadjustable).4. Loosen the two nut locking screws.