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EMCO W IN NC GE S ERIES F ANUC 21 MB P ROGRAMMING D 27 Back pocket drilling cycle G87 Back Pocket Drilling Cycle Only for machines with oriented spindle stop Format N... G87 X... Y... Z... R... Q... F... a boring or facing head. The tool will be positioned in X and Y and stopped oriented. It will be traversed horizontally for the distance Q against the stop direction of the oriented stop. The value Q must be larger than the tool diameter to avoid collisions. The tool traverses to the depth R (no machining). The tool traverses back horizontally for the distance Q on the position X, Y (machining). The tool traverses vertical to the height Z (machining). At height Z the spindle stops oriented, traverses horizontally for the distance Q against the stop direction of the oriented stop (into the existing drilling) and with rapid feed out of the drilling. The tool traverses horizontally for the value Q back to the position X,Y. G99 can not be programmed, the tool always retracts to the start plane. X, Y ........... Hole position Z ................ Absolute (incremental) drilling depth R [mm] ...... Back drilling depth F ................ Feed rate G88 Drilling Cycle with Program Stop Format N... G88 X... Y... Z... (R...) P... F... M... The tool traverses with feed rate to the programmed end depth. At the end depth the program will be stopped after the programmed dwell, retraction oc- curs manually. X, Y ........... Hole position Z ................ Absolute (incremental) drilling depth R [mm] ...... Absolute (with G91 incremental) value of the withdrawal plane P [msec] .... Dwell at end depth: P1000 = 1 sec F ................ Feed rate G88 Start plane Program stop Drilling cycle with program stop R 5 = 4 |