Process

When finish-drilling through/centring holes, the tool drills an existing drilled hole to the specified machining depth at the selected spindle speed and feedrate G01. The hole is produced in a single operation down to the final drilling depth. When the final drilling depth is reached, an optional dwell time can be programmed. When an optionally programmed dwell time expires, the tool is retracted from the drilled hole depending on the retraction mode.

• Retraction mode 0: The tool moves out of the drilled hole in rapid traverse at speed without lifting off.
• Retraction mode 1: The tool moves out of the drilled hole at feedrate and at speed without lifting off.
• Retraction mode 2: Spindle stops and is positioned. Lift-off first takes place at feedrate by the return clearance in the direction of the hole centre.
• Retraction mode 3: The spindle is stopped and moves at rapid traverse out of the drilled hole without lifting off.

Retraction ends at the safety clearance. Finally, the tool retracts to the specified retraction plane at rapid traverse.

Notice

When used in the finish-drilling cycle, it is technologically essential that the spindle can be operated as a position-controlled spindle since it is positioned internally in the cycle on retraction and is operated as a path axis.