Assessments - 3, GPA: 4.3
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Removing leadscrew dust cap. 3. Engage the halfnut with the leadscrew, then slowly rotate the carriage handwheel clockwise to pull the leadscrew away from the collar. Important: Take care in the next step not to bend the unsupported leadscrew. 4. Drill out the broken pieces of the shear pin from the leadscrew and collar. 5. Carefully use the carriage handwheel to reinsert the leadscrew into the collar, then disengage the halfnut. 6. Align the tapers of the shear pin holes in the collar and leadscrew, then carefully tap the shear pin in place. Note: Keep in mind that the shear pin holes are tapered and must be properly aligned to accept the new shear pin. 7. Replace the leadscrew dust cap removed in Step 2. -87- Gap Insert Removal & Installation 4. To remove the insert, rock it back-and-forth until the alignment pins are free of the bed. The gap insert directly under the spindle (see Figure 140) can be removed to create additional space for turning large diameter parts. Figure 140. Gap insert. NOTICE The gap insert was installed, then ground flush with the bed at the factory to ensure a precision fit and alignment. Therefore, if the gap insert is removed, it may be difficult to re-install it with the same degree of accuracy. Tools Needed Qty Hex Wrench 4mm..............................................1 Hex Wrench 8mm..............................................1 Dead Blow Hammer..........................................1 Magnetic-Based Dial Indicator (for installation)...........................................1 Gap Removal 1. DISCONNECT LATHE FROM POWER! 2. Unthread the preload set screw three or four turns to release the gap insert preload against the headstock casting. 3. Remove the four cap screws that secure the insert, then tap the sides of the insert with a dead blow hammer until it breaks loose. Gap Installation 1. DISCONNECT LATHE FROM POWER! 2. Use mineral spirits and clean, lint-free rag to clean the mating surfaces of the gap insert, bed, and ways. If necessary, stone the mating surfaces to remove scratches, dings, or burrs. 3. Apply a thin layer of light machine oil on the mating surfaces. 4. Place the insert into the gap while making sure the alignment pins are in the appropriate holes in the bed. 5. Use the dead blow hammer to fully seat and align the insert with the bed, then re-install the four cap screws removed with the insert and lightly snug them in place. 6. Move the saddle close to the gap insert and mount the dial indicator so that you can check the alignment in the next step. 7. First test the tops of the insert ways, then test the flanks. Alternately tighten the cap screws and tap the side of the insert with the dead blow hammer to bring it into alignment with the rest of the bed ways. 8. Tighten the preload set screw to add additional pressure on the insert against the bedways. 9. Inspect the gap insert alignment 24 hours after installation to make sure the gap is still aligned. If not, loosen the cap screws and preload set screw, then repeat Step 7-8 until the insert is properly aligned. -88- Model G9730/G9731 (Mfg. Since 9/00) Bearing Preload This lathe is shipped from the factory with the preload of the spindle tapered roller bearings properly adjusted. With use, the bearings will eventually wear and reduce the preload, causing excessive spindle end play, which is one cause for poor workpiece finish. If the spindle becomes hotter than you can comfortably leave your hand on after operating for longer than 10 minutes, there may be too much preload and premature wear of the spindle bearings and components could occur. If the lathe exhibits either of these symptoms, you can adjust the spindle bearing preload. Tools Needed Qty Hex Wrench 5mm..............................................1 Spanner Wrench 65mm....................................1 Magnetic-Based Dial Indicator..........................1 Heavy Dead Blow Hammer...............................1 Wooden Block...................................................1 To adjust the spindle bearing preload: 1. Run the lathe for approximately 20 minutes at a medium speed to bring the spindle components to their normal operating temperature. 2. DISCONNECT LATHE FROM POWER! 3. Remove the headstock left cover to access the outboard spindle cover (see Figure 141). Figure 141. Outboard spindle cover (viewed with headstock left cover removed). 4. Remove the three cover cap screws and the cover to expose the spindle nut, as shown in Figure 142. Figure 142. Spindle nut exposed. 5. With a piece of chalk, mark the rotational position of the spindle nut in relation to the spindle. This will record the original position of the spindle nut in case you need to start over. Model G9730/G9731 (Mfg. Since 9/00) -89- 6. Loosen the two cap screws on the spindle nut two or three turns so that the nut can be rotated in the following steps. 7. If you are performing this procedure because the normal o...
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