Lathe Operation
Symptom | Possible Cause | Possible Solution | ||
Bad surface finish. | 1. | Wrong spindle speed or feed rate. | 1. | Adjust for appropriate spindle speed and feed rate. |
| 2. | Dull tooling or wrong tool selection. | 2. | Sharpen tooling or select a better tool for the |
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| intended operation. |
| 3. | Tool height not at spindle centerline. | 3. | Adjust tool height to spindle centerline (see Page |
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| 38). |
| 4. | Too much play in gibs. | 4. | Tighten gibs (see Page 57). |
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Tapered tool difficult | 1. | Quill not fully retracted into tailstock. | 1. | Turn quill handwheel until tapered tool is forced out |
to remove from |
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| of quill. |
tailstock quill. | 2. | Contaminants not removed from taper | 2. | Clean taper and bore, then |
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| before inserting into quill. |
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Cross slide, | 1. | Ways loaded with shavings, dust, or grime. | 1. | Clean ways and relubricate. |
compound rest, or | 2. | Gibs are out of adjustment. | 2. | Adjust gibs (see Page 57). |
carriage feed has | 3. | Handwheel loose or excessive backlash. | 3. | Tighten handwheel fasteners, adjust handwheel |
sloppy operation. |
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| backlash to a minimum (see Page 56). |
| 4. | Leadscrew mechanism worn or out of | 4. | Adjust leadscrew to remove end play (see Page |
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| adjustment. |
| 56). |
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Cross slide, | 1. | Ways loaded with chips, dust, or grime. | 1. | Clean ways and lubricate. |
compound, | 2. | Gibs are too tight. | 2. | Loosen gibs slightly (see Page 57). |
or carriage | 3. | Backlash setting too tight. | 3. | Slightly loosen backlash setting (see Page 56). |
handwheels hard to | 4. | Bedways are dry. | 4. | Lubricate bedways. |
move. | 5. | Half nut lever engaged. | 5. | Disengage half nut lever for manual feeding. |
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Cutting tool | 1. | Tool holder not tight enough. | 1. | Check for debris, clean, and retighten. |
or machine | 2. | Cutting tool sticks too far out of tool holder; | 2. | |
components vibrate |
| lack of support. |
| length is sticking out of tool holder. |
excessively during | 3. | Gibs are out of adjustment. | 3. | Adjust gibs at affected component (see Page 57). |
cutting. | 4. | Dull cutting tool. | 4. | Replace or resharpen cutting tool. |
| 5. | Incorrect spindle speed or feed rate. | 5. | Use the recommended spindle speed and feed rate. |
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Workpiece is | 1. | Headstock and tailstock not properly | 1. | |
tapered. |
| aligned. |
| (see Page 32). |
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Chuck jaws will | 1. | Chips lodged in jaws or scroll plate. | 1. | Remove jaws, clean and lubricate scroll plate, then |
not move or do not |
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| replace jaws. |
move easily. |
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Model G0765 (Mfd. Since 12/13) |
