Assessments - 3, GPA: 3.7
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5. Position the locking yoke back inline with the setscrew holes on the draw tube assembly, then secure the setscrews and the jam nuts as shown in Figure 10. -6 Figure 10. Tightening yoke setscrews. 6. Thread the setscrews on both sides of the locking yoke into the holes on both sides of the bearing housing. Make sure the setscrews are completely and evenly engaged into the holes, without being tight. 7. The yoke should have no play from side-toside, but still pivot freely. Tighten the jam nuts. 8. The ideal locked position for the collet closer is shown in the completed assembly diagram in Figure 11. Figure 11. Completed collet closer assembly. G8143 Collet Closer 3. The two 30mm spanners define the stroke distance. Secure the setscrew in the outer 30mm spanner nut to lock the stroke distance. Make sure proper turning clearance exists between the bearing casing and the locking yoke before operation. Serious personal injury or damage to the lathe and collet closer can occur if there is contact. Rotate draw tube and check for clearance. DO NOT make adjustments, remove workpiece or open back cover of lathe while the machine is in motion. Locking Stroke To adjust the locking stroke on your collet The mechanism that controls the stroke is depict- closer: ed in detail in Figure 14. 1. Position the locking pawls so they are in the correct position on the cam as shown in Figure 12. 2. Secure the 38mm spanner nut against the outboard side of the bearing housing and then secure the 30mm spanner nuts against the 38mm spanner nut as shown in Figure 13. Note—Be sure that the 30mm spanner with the setscrew is on the outside, with the setscrew accessible. 30mm spanners 38mm spanner Figure 13. Spanner nut positioning for locking stroke adjustment. Locking Pawl Figure 12. Locking pawls in locked position on the cam lobe. E Figure 14. Stroke adjustment assembly. G8143 Collet Closer -7 Removal of 5-C Collet To remove or replace your 5-C collet in the collet closer assembly: 1. Choose a 5-C collet that is suitable for the intended stock size to be turned. 2. Disengage the hub locking pin so the flat is turned toward the outer rim of the hub adapter as shown in Figure 15. Pin Disengaged Pin Engaged Figure 15. Locking pin positions. 3.Rotate the draw tube counter-clockwise at the end of the collet closer (Figure 16)to unthread the collet. The draw tube threads may be sharp. To avoid cutting your hands, use a clean rag to rotate the draw tube. 4. Remove the collet from the collet adapter and insert the new 5-C collet. 5. Rotate the draw tube clockwise at the end of the collet closer to engage the new collet threads. 6. Engage the hub locking pin back into place as shown in Figure 15. Figure 16. Location to rotate draw tube to remove or replace 5-C collets. Installing 5-C Collet To adjust your 5-C collet in the collet closer assembly: 1. Choose a 5-C collet that is suitable for the intended stock size to be turned. 2. Line up the collet keyway with the collet adapter pin and insert the collet until it stops, then gently rotate it for final alignment. 3. Gently push on the end of the draw tube until it engages the collet threads in the spindle, and rotate the adjusting hub in a clockwise fashion (as viewed from the outboard end of the lathe in Figure 8). — If the draw tube fails to touch the collet, remove the collet and look into the spindle to see if the draw tube is accessible for proper engagement. If the collet cannot touch the draw tube when inserted into the spindle, see the following section on “Rough Adjustment.” If the collet does reach, try again to thread the collet and adapter into the spindle by following the guidelines in the “Tube Assembly” sub-section of this manual. -8- G8143 Collet Closer Rough Adjustment If rough adjustments need to be made to the collet closer assembly: 1. In the event that the previous adjustments fail to allow the collet to lock onto the material or the draw tube fails to touch the collet, adjust the adapter hub in or out. 2. Loosen the setscrews and turn the hub adapter in a clockwise direction if the draw tube does not contact the back of the collet. 3. Turn the hub adapter counter-clockwise if the work material cannot be locked by the collet. 4. Tighten the setscrews. The Model G8143 Collet Closer is adjusted properly when the 3 collet locking pawls are tight on the cam and the workpiece will not twist in the collet. Again, Figure 12 on page 7 shows the proper locked position of the collet locking pawls around the cam. Maintenance The Model G8143 Collet Closer is essentially a maintenance free tool; however, some things to keep in mind are: 1. Make sure that all the components of your collet closer are assembled correctly, according to this manual. 2. Once the replacement stud and hub adapter are installed, they will not need to be removed. 3. Ensure that your locking mechanism is working properly before you start any projects on your lathe. 4. Check the locking stroke for proper placemen...
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