5.2.8 Drilling with stop 2 (boring 4) CYCLE88

Programming:

CYCLE88 (RTP, RFP, SFD, DEP, RDP, DTB, SDIR)

Parameters:

                                                                  Fig.5.9 CYCLE88

Function:

The tool drills at the programmed spindle speed and feedrate to the entered final drilling depth. During boring pass 4, a dwell time, a spindle stop without orientation M05 and a programmed stop M 0 are generated when the final drilling depth is reached. Pressing the NC START key traverses the outward movement at rapid traverse until the retraction plane is reached.

Sequence:

1. Approach of the reference plane brought forward by the safety clearance by using G00

2. Traversing to final drilling depth with G1 and the feedrate programmed prior to the cycle call

3. Dwell time at final drilling depth

4. Spindle stop with M05, program stop with M00

5. Press the NC START key.

6. Retraction to the retraction plane with G00

Explanation of the parameters:

1. For parameters RTP,RFP,SFD,DEP,RDP, see CYCLE81;

2. DTB(dwell time): The dwell time to the final drilling depth is programmed under DTB in seconds.

3. SDIR(direction of rotation): This parameter determines the direction of rotation with which the drilling operation is carried out in the cycle. If values other than 3 or 4 (M03/M04) are generated, alarm is generated and the cycle is aborted.

Example:

CYCLE88 is used for boring with stop 2. The drilling axis is the Z axis. Programming zero point is the center of end face. Dwell time is 1 second.