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TECHNICAL REFERENCE
SERVICE
MANUAL
VF-SERIES
6. TWO-SPEED GEAR TRANSMISSION VF-1/2/3/4/6
The spindle head contains a two-speed gear transmission. The spindle motor is directly coupled to the transmission and the
transmission is cog belt-coupled to the spindle.
6.1 GEAR BOX LUBRICATION
Gear Box: Mobil DTE 25 oil.
The spindle is air-pressurized and oil drip lubricated. The gear box uses an oil sump in the VF-1 thru 6 and is cooled by gear
oil. The VF-0 does not have a gearbox and is air cooled.
6.2 GEAR BOX AIR SOLENOIDS
There is a double solenoid valve controlling air to the gear box. This solenoid sends air to select either the high gear or the
low gear. When power is removed from the solenoids, the valve remains in its last state. Air is always required to ensure the
gears are held in either high of low gear. Circuit breaker CB4 will interrupt power to these solenoids. Power is left on the
solenoid which is commanded last.
6.3 GEAR BOX SENSE SWITCHES
On the VF-1 thru VF-6, there are two switches in the gear box used to sense the position of the gears. One switch indicates
HIGH by opening and the other indicates LOW by opening. Between gears, both switches are closed indicating a between-
gear condition. The diagnostic display shows the status of these switches and the CURNT COMDS display shows which
gear is selected. If the switches indicate that the gear box is between gears, the display will indicate No Gear.
6.4 GEAR CHANGE SEQUENCE
When a gear change is performed, the following sequence of events occurs:
1) If the spindle is turning, it is commanded to stop,
2) Pause until spindle is stopped,
3) Gear change spindle speed is commanded forward,
4) Pause until spindle is at speed,
5) Command high or low gear solenoid active,
6) Pause until in new gear or reversal time,
7) Alarm and stop if max gear change time elapsed,
8) If not in new gear, reverse spindle direction,
9) Turn off high and low gear solenoids
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