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SYMPTOM
Motor will not start
Motor will not start; fuses blown or circuit
breakers are tripped
POSSIBLE CAUSE(S)
1. Low voltage
2. Open circuit in motor or loose
connections.
3. Electronic failure in circuit card
4. Motor brushes are worn down
1. Short circuit in line cord or plug
2. Short circuit in motor or loose
connections
Motor fails to develop full power (power
output of motor decreases rapidly with
decrease in voltage at motor terminals)
Motor overheats
Motor stalls (resulting in blown fuses or
tripped circuit breakers
Machine slows down while operating
Tool "chatters" during turning operation
3, Incorrect fuses or circuit breakers
in power line
1. Power line overloaded with lights,
appliances and other motors
2. Undersize wires or circuits too long
3. General overloading of power
company's facilities
Motor overloaded
1. Short circuit in motor or loose
connections
2. Low voltage
3. Incorrect fuses or circuit breakers
in power line
4. Motor overloaded
Applying too much pressure to workpiece
1. Workpiece is too far out-of-round
2. Workpiece has too much wobble
3. Operator using bad technique
4. Cutting motion is against the grain of
the workpiece
5. Workpiece is too long and thin -
workpiece is deflected by tool pressure
CORRECTIVE ACTION
1. Check power line for proper voltage
2. Inspect all lead connections on motor
for loose or open connection
3. Replace circuit card
4. Replace brushes
1. Inspect line cord or plug for damaged
insulation and shorted wires
2. Inspect all lead connections on motor
for loose or shorted terminals or
worn insulation on wires
3. Install correct fuses or circuit breakers
1. Reduce the load on the power line
2. Increase wire sizes or reduce length
of wiring
3. Request a voltage check from the
power company
Reduce load on motor
1. Inspect connections in motor for
loose or shorted terminals or
worn insulation on lead wires
2. Correct the low line voltage conditions
3. Install correct fuses or circuit breakers
4. Reduce load on motor
Ease up on pressure
1 True up the roundness of the
workpiece before turning operation
2. Establish new center marks on ends
to reduce wobble
3. Read instructions and take lighter cuts
to minimize chatter
4. Use cutting motion that is with
the grain
5. Install a steady rest in the middle,
behind the workpiece
Workpiece splits or "breaks up" during Workpiece contained defects before Select or assemble a workpiece that is
turning operation mounting free of defects
Index wheel "chatters" during operation High speed Operate unit only 400 RPM
or comes loose
21
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