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XYZ Machine Tools
ProTURN SLX 1630 ProtoTRAK SLX CNC Safety, Installation, Service & Parts List Manual
3.5.2 Spindle Motor Hums or Will Not Run
The spindle motor makes a constant humming noise during operation or will not turn
on.
Possible Cause
Check This
Wrong voltage
Check the 415V voltage to the machine
Poor wiring connections
Check all the wiring connections to the electric’s box.
Defective cable connections
Check all cable connections
Spindle Motor is bad
Check the resistance of the Spindle Motor windings on the Spindle
Motor between L1 & L2, L2 & L3, and L1 & L3, using an Ohmmeter.
The resistance should range from ".7 to 1.8 Ohm". If the Ohmmeter
reads "0 Ohms" or "OL", then replace Spindle Motor. Next, check the
resistance between L1 & Ground, L2 & Ground, and L3 & Ground,
using an Ohmmeter. The resistance should read "OL". If not then
replace Spindle Motor.
3.5.3 Spindle Runs Backwards
The spindle motor runs in the opposite direction.
Possible Cause
Check This
3-Phase wires backwards
Need to switch any 2 of the 3 wires either coming out of the
Spindle Drive (T1, T2, and T3) or going into the Spindle Motor (U,
V, and W). Caution: Be sure to shut off all power to the machine
before attempting to switch any wires.
3.5.4 Excess Gearbox Noise
Gearbox noise is louder than normal. Run the lathe at the gear where the noise is
most noticeable. Remove the gearbox lid and try to isolate where the noise is
coming from.
Possible Cause
Check This
Insufficient amount of oil in headstock
Check site glass to make sure oil is at sufficient level.
Spindle bearing not being lubricated
properly, worn bearing
Remove top lid and check to make sure oil is
overflowing freely to the spindle bearings.
Spindle preload loose
Tighten spindle preload on bearing. The spindle
preload should be approximately 1.1 – 1.7 N-m.
3.5.5 Headstock is Leaking Oil
A Form-A-Gasket sealant should be use to seal any leaking areas. Make sure the
sealant fills the leaking area thoroughly. Sealant must cure for 24 hours for best
results.
3.5.5.1
Leaking Oil from Rear of Gearbox
Possible Cause
Check This
Leaking from behind belt drive pulley
Replace shaft seal - o-rings or gaskets.
Oil leaking from behind the spindle
encoder.
Remove spindle encoder and pinion shaft cover.
Check the seal.
Oil leaking from the rear bearing
assembly.
Make sure the spindle shaft cover is mounted
correctly, if so remove the cover and check the o-ring.