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Model G0757Z (Mfd. Since 02/15)
-57-
Symptom Possible Cause Possible Solution
Bad surface finish. 1. Spindle speed/feed rate is too fast.
2. Workpiece not secure.
3. Spindle extended too far down.
4. Dull or incorrect cutting tool.
5. Wrong rotation direction of cutting tool.
1. Set spindle speed correctly or use slower feed rate
(Page 35).
2. Properly clamp workpiece on table or in vise.
3. Fully retract spindle and lower headstock. This
increases rigidity.
4. Sharpen cutting tool or select one that better suits
the operation.
5. Check for proper cutting tool rotation direction.
Cutting results not
square.
1. Table and spindle are not at 90° to each
other.
2. Table travel is inconsistent.
1. Tram the spindle (Page 58).
2. Adjust gibs (Page 61).
Spindle overheats. 1. Poor spindle bearing lubrication.
2. Spindle bearings too tight.
3. Mill operated at high speeds for extended
period.
1. Lubricate spindle bearings.
2. Properly adjust spindle bearing preload.
3. Allow mill to cool.
Lack of power at
spindle.
1. V-belts are loose.
2. Wrong voltage.
1. Properly tension V-belts (Page 52).
2. Correct voltage.
Spindle does not
return to highest
position.
1. Poorly adjusted return spring.
2. Worn return spring.
1. Increase return spring tension.
2. Replace return spring.
Control Panel
FORWARD and
REVERSE buttons
do not work.
1. Shorted/disconnected wiring. 1. Inspect circuit boards, wiring connections. Replace/
repair as necessary.
Power feed does
not move table or is
slipping.
1. Table locked.
2. Drive selector not engaged.
3. Sheared pin.
4. Gears not meshing or teeth missing.
5. Motor shaft and gear shaft not engaged.
1. Unlock table locks (Page 28).
2. Select speed, engage drive selector.
3. Replace pin.
4. Check gears and adjust/replace.
5. Replace clutch.
Operates at high
speed only or is
inconsistent.
1. Rapid micro switch is stuck.
2. Variable-speed dial doesn't work properly.
3. Wiring harness disconnected.
1. Lightly tap on it to lower it.
2. Test/Repair/Replace.
3. Reconnect wiring harness.
Lamp will not light. 2. Power not turned on.
3. Bulb is burned out.
1. Short in wiring or wired incorrectly.
2. Press switch/button on lamp or control panel.
3. Replace bulb.
1. Trace and test wiring. Fix any errors.
DRO doesn't give
reading.
1. DRO is not turned on.
2. Batteries are dead.
3. Shorted/disconnected wiring/plugs.
1. Switch DRO ON/Power button.
2. Change batteries.
3. Inspect circuit boards, sensors, plugs, and wiring
connections. Replace/repair as necessary.
DRO reading is
incorrect.
1. Initial reading is incorrect.
2. Sensor has gone bad.
3. Spacing between sensor and scale is
incorrect.
1. Tare/Zero/Reset DRO at beginning point.
2. Test/replace sensor as necessary.
3. Adjust spacing between sensor and scale.