1-15-96
96-8100
7
TABLE OF CONTENTS
HAAS
AUTOMATION, INC.
TROUBLESHOOTING
S E R V I C E M A N U A L
VF-S
ERIES
2.3 OVERHEATING
When investigating complaints of overheating, a temperature probe must be used to accurately check the temperature at the
top of the spindle taper. The temperature displayed in Diagnostics is not relevant. A machine that runs at high RPM
continuously will have a much warmer spindle than a machine that runs at a lower RPM. New spindles tend to run much
warmer than spindles that have already been broken in. In order to run a valid test on a new spindle, ensure that it is properly
broken in.
To break in a spindle, run the following program (it will take approximately 6 hours):
N100 S300 M03
G04 P900.
N700 S6000 M03
G04 P900.
M05
G04 P900.
M05
G04 P900.
M05
G04 P900.
G04 P900.
G04 P900.
N200 S1000 M03
N500 S4000 M03
G04 P900.
G04 P900.
G04 P900.
N800 S7500 M03
M05
M05
G04 P900.
G04 P900.
G04 P900.
M05
N300 S2000 M03
G04 P900.
G04 P900.
G04 P900.
N600 S5000 M03
G04 P900.
M05
G04 P900.
M99
G04 P900.
M05
G04 P900.
G04 P900.
N400 S3000 M03
G04 P900.
NOTE:
This program will step the spindle speed from 300 RPM up to either 5000 or 7500 RPM at regular
intervals of time, stop the spindle and allow it to cool to room temperature, then restart it so the temperature
can be monitored.
l
If at any time during this procedure the spindle temperature rises above 150 degrees, start the procedure
over from the beginning.
If the spindle fails this test for any reason, check the following:
l
Check for correct amount of lubrication.
NOTE:
Over lubrication is a common source of overheating. Check the oil flow carefully.
l
Check the drive belt tension. Too-tight belts will cause heating of the top bearing in the spindle housing.
l
Ensure that the correct oil is being used (refer to "Maintenance Schedule").
2.4 STALLING/LOW TORQUE
Generally, complaints of stalling or low torque relate to incorrect tooling or machining practices. A spindle that is tending to
seize will yield a poor finish machining, run very hot and very loud. Investigate machining problems before concluding the
problem exists with the spindle or spindle drive.
Summary of Contents for VF-SERIES
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