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TECHNICAL REFERENCE

445

June 1999

96-8000

12.2 TOOL C LAMP/UNCLAMP

The tool holder drawbar 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 side of the spindle head. The two manual buttons only operate in MDI or JOG modes.

TOOL C LAMP/UNCLAMP A IR S OLENOIDS

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.

TOOL C LAMP/UNCLAMP S ENSE S WITCHES

There are two switches used to sense the position of the tool clamping mechanism. They are both normally

closed 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 (with 40 taper spindle only).

REMOTE T OOL U NCLAMP S WITCH

The Remote Tool Unclamp switch is mounted on the side 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.

Haas VF Series Operator's Manual

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