1-15-96 96-8100
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TABLE OF CONTENTS
TECHNICAL REFERENCE
SERVICE
MANUAL
VF-SERIES
2. TOOL CLAMP/UNCLAMP
The tool holder draw bar is held clamped by spring pressure. Air pressure is used to release the tool clamp. When the tool
is unclamped, air is directed down the center of the spindle to clear the taper of water, oil, or chips. Tool unclamp can be
commanded from a program (but this is quite dangerous), from the keyboard, and from the button on the front of the spindle
head. The two manual buttons only operate in MDI or JOG modes.
2.1 TOOL CLAMP/UNCLAMP AIR SOLENOIDS
A single solenoid controls the air pressure to release the tool clamp. This corresponds to relay K15. When the relay is
activated, 115V AC is applied to the solenoid. This applies air pressure to release the tool. Relay K15 is on the I/O PCB.
Circuit breaker CB4 will interrupt power to this solenoid.
2.2 TOOL CLAMP/UNCLAMP SENSE SWITCHES
There are two switches used to sense the position of the tool clamping mechanism. They are both normallyclosed and
one will activate at the end of travel during unclamping and the other during clamping. When both switches are closed, it
indicates that the draw bar is between positions.
A tool change operation will wait until the unclamped switch is sensed before the Z-axis pulls up from the tool. This prevents
any possibility of breaking the tool changer or its support mounts.
The diagnostic display can be used to display the status of the relay outputs and the switch inputs.
The Precharge and Through the Spindle Coolant system applies low air pressure and releases the clamped switch.
2.3 REMOTE TOOL UNCLAMP SWITCH
The Remote Tool Unclamp switch is mounted on the front of the cover to the spindle head. It operates the same as the button
on the keyboard. It must be held for ½ second before the tool will be released and the tool will remain released for ½ second
after the button is released.
While the tool is unclamped, air is forced down the spindle to clear chips, oil, or coolant away from the tool holder.
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