Section 7: Service; Troubleshooting - Grizzly G0745 Owner's Manual

4" x 6" micro metal lathe
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SECTION 7: SERvICE

Review the troubleshooting and procedures in this section if a problem develops with your machine. If you
need replacement parts or additional help with a procedure, call our Technical Support at (570) 546-9663.
Note: Please gather the serial number and manufacture date of your machine before calling.
Symptom
possible Cause
Machine does not
1. Emergency stop button engaged or at fault.
start or a circuit
breaker trips.
2. spindle speed dial turned to "0" or at fault.
3. Wall fuse/circuit breaker is blown/tripped;
short in electrical system; start-up load too
high for circuit.
4. Wiring is open/has high resistance.
5. Motor connection wired wrong.
6. Machine fuse at fault.
7. Motor brushes at fault.
8. Motor at fault.
Motor is loud when
1. Excessive depth of cut or feed rate.
cutting, bogs down
2. spindle speed or feed rate wrong for
under load, or
cutting operation.
overheats.
3. Cutting tool is dull.
Entire machine
1. Workpiece is unbalanced.
vibrates upon
startup and while
2. Workpiece is hitting stationary object.
running.
3. loose or damaged V-belt.
4. Chuck or faceplate is unbalanced or not
installed properly.
5. spindle bearings at fault.
Bad surface finish.
1. Wrong spindle speed or feed rate.
2. dull tooling or poor tool selection.
3. tool height not at spindle centerline.
4. too much play in gib.
Model G0745 (Mfg. Since 11/13)

Troubleshooting

possible Solution
1. rotate button clockwise until it pops out to reset it
for operation; replace if not working properly.
2. turn spindle speed dial past "1". Ensure dial has
correct voltage. replace if faulty.
3. Verify circuit is rated for machine amp load;
troubleshoot and repair cause of overload; replace
weak breaker; find/repair electrical short.
4. Check for broken wires or disconnected/corroded
connections, and repair/replace as necessary.
5. Correct motor wiring connections (page 40).
6. replace fuse (page 37).
7. replace brushes (page 38).
8. test/repair/replace.
1. decrease depth of cut or feed rate.
2. refer to the feeds and speed charts in Machinery's
Handbook or a speeds and feeds calculator on the
internet.
3. sharpen or replace the cutting tool.
1. re-install workpiece as centered with the spindle
centerline as possible.
2. stop lathe immediately and correct interference
problem.
3. retension/replace the V-belt as necessary (page
36).
4. Check installation; rebalance chuck or faceplate;
contact a local machine shop for help.
5. replace worn spindle bearings.
1. adjust for appropriate spindle speed and feed rate.
2. sharpen tooling or select a better tool for the
intended operation.
3. adjust tool height to spindle centerline (page 27).
4. tighten gib (page 36).
-33-

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