Assessments - 4, GPA: 4.5
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3. slightly loosen backlash setting (page 63). 4. lubricate bedways and handles. Bad surface finish. 1. Wrong rpM or feed rate. 2. dull tooling or poor tool selection. 3. too much play in gibs. 4. tool too high. 1. Adjust for appropriate rpM and feed rate. 2. sharpen tooling or select a better tool for the intended operation. 3. tighten gibs (page 61). 4. lower the tool position. inaccurate turning results from one end of the workpiece to the other. 1. headstock and tailstock are not properly aligned with each other. 1. realign the tailstock to the headstock spindle bore center line (page 36). Chuck jaws won't move or don't move easily. 1. Chips lodged in the jaws. 1. remove jaws, clean and lubricate chuck threads, and replace jaws. Carriage won't auto feed, or overloads the spindle motor. 1. Carriage or gib lock is applied. 2. gears are not all engaged or broken. 3. gibs are too tight. 4. leadscrew shear pin has sheared. 1. release locks. 2. Adjust gear positions or replace. 3. loosen gib screw(s) slightly (page 61). 4. Correct the cause of shear pin breakage, and replace shear pin. tailstock quill will not feed out of tailstock. 1. Quill lock lever is tightened down. 1. turn lever counterclockwise. operation and Work results symptom possible Cause possible solution entire machine vibrates excessively upon startup and while running. 1. Workpiece is unbalanced. 2. Worn or broken gear present. 3. Chuck or faceplate has become unbalanced. 4. spindle bearings at fault. 1. reinstall workpiece so it is as centered with spindle centerline. 2. inspect gears and replace if necessary. 3. rebalance chuck or faceplate; contact a local machine shop for help. 4. Adjust or replace spindle bearings. Cutting tool or machine components vibrate excessively during cutting. 1. tool holder not tight enough. 2. Cutting tool sticks too far out of tool holder; lack of support. 3. gibs are out of adjustment. 4. dull cutting tool. 5. incorrect spindle speed or feed rate. 1. Check for debris, clean, and retighten. 2. reinstall cutting tool so no more than 1.3 of the total length is sticking out of tool holder. 3. tighten gib screws at affected slide (page 61). 4. replace or re sharpen cutting tool. 5. use the recommended spindle speed or feed rate (page 41). Can't remove tapered tool from tailstock quill. 1. Quill had not retracted all the way back into the tailstock. 2. debris is binding arbor in quill. 3. incorrect arbor or tooling inserted into quill. 1. turn the quill handwheel until it forces taper out of quill. 2. extend quill to expose drift slot and use drift key to remove arbor. 3. remove quill and drive out tooling or arbor with punch. Cross slide, compound rest, or carriage feed has sloppy operation. 1. gibs are out of adjustment. 2. handwheel is loose or has excessive backlash. 3. leadscrew mechanism worn or out of adjustment. 1. tighten gib (page 61). 2. tighten screws and adjust backlash (page 63). 3. tighten any loose fasteners on leadscrew mechanism. Cross slide, compound rest, or carriage feed handwheel is hard to move. 1. gibs are loaded up with shavings or grime. 2. gibs are too tight, gib lock or carriage lock is applied. 3. Backlash setting too tight (cross slide only). 4. Bedways are dry. 1. remove gibs, clean ways/dovetails, lubricate, and readjust gibs. 2. loosen gib adjustment and gib locks, release carriage lock (page 61). 3. slightly loosen backlash setting (page 63). 4. lubricate bedways and handles. Bad surface finish. 1. Wrong rpM or feed rate. 2. dull tooling or poor tool selection. 3. too much play in gibs. 4. tool too high. 1. Adjust for appropriate rpM and feed rate. 2. sharpen tooling or select a better tool for the intended operation. 3. tighten gibs (page 61). 4. lower the tool position. inaccurate turning results from one end of the workpiece to the other. 1. headstock and tailstock are not properly aligned with each other. 1. realign the tailstock to the headstock spindle bore center line (page 36). Chuck jaws won't move or don't move easily. 1. Chips lodged in the jaws. 1. remove jaws, clean and lubricate chuck threads, and replace jaws. Carriage won't auto feed, or overloads the spindle motor. 1. Carriage or gib lock is applied. 2. gears are not all engaged or broken. 3. gibs are too tight. 4. leadscrew shear pin has sheared. 1. release locks. 2. Adjust gear positions or replace. 3. loosen gib screw(s) slightly (page 61). 4. Correct the cause of shear pin breakage, and replace shear pin. tailstock quill will not feed out of tailstock. 1. Quill lock lever is tightened down. 1. turn lever counterclockwise. operation and Work results -60 Model g0709 (Mfg. since 5/11) gib adjustments the cross-slide and compound slide on this lathe each use a long steel wedge called a gib that is positioned between the component and its dovetailed-ways. At the end of each gib is a gib screw one of which is shown in figure 98. the screws at each end of the gib oppose one another to move and hold the gib in a forwar...