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TECHNICAL REFERENCE
June 1999
96-8000
12.3 SPINDLE OPERATION
Spindle speed functions are controlled primarily by the S address code. The S address specifies RPM in
integer values from 1 to maximum spindle speed (Parameter 131). NOT TO BE CHANGED BY USER! When
using the Through the Spindle Coolant option, the maximum spindle speed is 7500 RPM (5000 RPM for 50
taper spindles).
Speeds from S1 to the Parameter 142 value (usually 1200) will automatically select low gear and speeds above
Parameter 142 will select high gear. Two M codes, M41 and M42 can be used to override the gear selection.
M41 for low gear and M42 for high gear. Low gear operation above S1250 is not recommended. High gear
operation below S100 may lack torque or speed accuracy. Spindle speed accuracy is best at the higher
speeds and in low gear.
If there is no gear box in your machine (VF-0/E/OE) the gear box is disabled by parameters, it is always in high
gear, and M41 and M42 commands are ignored.
The spindle is hardened and ground to the precise tool holder dimensions providing an excellent fit to the
holder.
SPINDLE W ARM-UP / BREAK-IN
Spindle Warm-up Program
All spindles, which are to be run at speeds above 6000 RPM for extended periods of time, must be warmed up
prior to use. A 20 minute warm-up program has been supplied with the machine, which will bring the spindle up
to speed slowly and allow the spindle to thermally stabilize. The program number is O02020 (Spindle Warm-up
Program).
Spindle Break-in Program
All spindles, which have been idle for more than 4 days, must be thermally cycled prior to running above 6000
RPM. This will prevent possible overheating of spindle due to settling of lubrication. A program has been
supplied with the machine for spindle break-in at initial machine installation and for long periods of machine
down time. The program number is O02021 (Spindle Break-in Program). Cycle Time:2 hours
These programs can be used for all spindle types. For machines equipped with 7,500 RPM or 10,000 RPM
spindles run the above programs with spindle speed override at 100%. For machines equipped with 15,000
RPM spindle, run spindle speed override at 150%. For machines equipped with a 50 taper spindle, run spindle
speed override at 50%.
If either of these programs were not supplied with the machine, contact your dealer for a copy.
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