Specifications

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CONCISE GUIDE FANUC 111
7.5 USE OF SPINDLE BRAKE
The machines with the axis C option have a brake which acts on a disk integral with the spindle,
preventing rotation due to any machining stress. The functions to manage the brake are:
• M20 Þ Activation of main spindle brake
• M21 Þ Deactivation of main spindle brake
In machines with the back spindle option these instructions are also used:
• M220 Þ Activation of back spindle brake
• M221 Þ Deactivation of back spindle brake
The use of the brake is advised for milling and drilling holes with spindle stationary, that is, when axis C is
used as spindle orientation (divider type) to ensure better system stability (for example working on holes,
tapping, key seats etc.) . It is not possible to program the spindle rotation with the brake on (M20 active) or
when programming in imaginary co-ordinates (G112 or G107) since the axis interpolation requires spindle
movement.