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manual abstract
This will be removed later. 18 To Shape the Interior of a Bowl 1. Stop the lathe and move the tailstock away. Remove the center from the tailstock to prevent bumping it with your elbow. 2. Adjust the tool support in front of the bowl just below the centerline, at a right angle to the lathe bed. 3. Rotate the workpiece by hand to check the clearance. 4. Face off the top of the bowl by making a light shearing cut across the workpiece, from rim to center. 5. Place the 1/2" bowl gouge on the tool rest at the center of the workpiece with the flute facing the top of the bowl. The tool handle should be level and pointed toward four o'clock, see Figure 22. 6. Use your left hand to control the cutting edge of the gouge, while your right hand swings the tool handle around towards your body, see Figure 22. The flute should start out facing the top of the workpiece, and rotate upward as it moves deeper into the bowl to maintain a clean even curve. As the tool goes deeper into bowl, progressively work out toward the rim. It may be necessary to turn the tool rest into the workpiece, as you get deeper into the bowl. Note: Try to make one, very light continuous movement from the rim to the bottom of the bowl to ensure a clean, sweeping curve through the workpiece. Should there be a few small ridges left, a light cut with a large domed scraper can even out the surface. 7. Develop the wall thickness at the rim and maintain it as you work deeper into the bowl. When the interior is finished, move the tool support to the exterior to re-define the bottom of the bowl. General rule of thumb: the base should be approximately 1/3 the overall diameter of the bowl. 8. Work the tight area around the faceplate or chuck with 1/4" bowl gouge. Sanding and Finishing a Bowl 1. Remove the tool rest and begin with a fine grit sandpaper (120 grit) and progress through each grit, using only light pressure. Coarser sandpaper tends to leave deep scratches that are hard to eliminate. Use power-sanding techniques to avoid concentric sanding marks around your finished piece. Avoid rounding over the rim and foot with sandpaper. Try to keep the details crisp. Finish sanding with 220 grit. 2. Remove sanding dust with tack rags, or compressed air and, with the lathe turned off, apply the first coat of finish. Let it stand for several minutes and wipe off the excess. Allow it to dry before sanding again with 320 or 400 grit sandpaper. 3. Turn lathe back on and make a separation cut through the base. Stop at about 3" and use a small fine tooth saw to separate the bowl from the waste. 4. Apply additional finish coats and allow to dry before buffing. 19 Adjusting the Clamping Mechanism The clamps are pre-set at the factory and should not need any adjustment. However, if adjustment is needed, remove the stud (A, Fig. 23). Loosen the locking handle and slide the headstock, tailstock or tool rest to the edge of the bed and slightly turn the hex nut (B, Fig. 23). Slide back into position and test the handle to make sure it securely locks. Changing the Belt and Bearings Changing belt and bearings can be a difficult task, and should be performed by a JET authorized repair station. Remove headstock and take into a repair station for servicing. 1. Place the belt in its highest speed range. Do not change speeds while changing the belt or bearings. 2. Remove the belt cover, and remove the belt from the lower pulley, see Figure 24. 3. Loosen the two setscrews in the handwheel enough to unthread the handwheel (C, Fig. 24). 4. Loosen the socket head cap screw enough to unthread the clamping nut (D, Fig. 24). 5. Remove one e-ring (E, Fig. 24) from spindle. 6. Loosen the two setscrews in the right hand pulley (F, Fig. 24). 7. Use a wood dowel, or aluminum stock to knock the spindle towards the tailstock. Use a material that is softer than the spindle so you do not mushroom the end of the spindle. Go only far enough to remove the right hand pulley and belt from spindle, see Figure 25 when changing the belt. Note: Mark the key way on the pulley for easy reference when reassembling. 8. Now you can replace the belt or bearings. There are three bearings #6, 9 and 43 that can be seen in the “Headstock Assembly,” page 24. 9. To reassemble reverse the procedure. Note: Key way alignment is critical for installment and proper operation. Do not force the pulley. When reinstalling clamping nut thread it on to the spindle until its snug. Then back off slightly and tighten the socket head cap screw. 20 Troubleshooting Problem Possible Cause Solution Excessive Vibration. 1. Workpiece warped, out of round, has major flaw, improperly prepared for turning, or RPM is set too high 2. Worn spindle bearings 3. Worn belt 4. Motor mount bolts loose 5. Lathe on uneven surface 1. Correct problem by planing, bandsawing, reduce the RPM, or scrap workpiece all together 2. Replace bearings 3. Replace belt 4. Tighten bolts 5. Shim lathe bed, or adjust feet on stand Motor or Spindle Stalls or Will not St...