NCT Group 2000M, 99M manual Back Boring Cycle

17 Canned Cycles for Drilling

Fig. 17.1.12-2

B. Back Boring Cycle

If the machine is provided with the facility of spindle orientation (parameter ORIENT1=1), the control will act in conformity with case "B".

The variables of cycle are

G17 G87 Xp__ Yp__ I__ J__ Zp__ R__ F__ L__

G18 G87 Zp__ Xp__ K__ I__ Yp__ R__ F__ L__

G19 G87 Yp__ Zp__ J__ K__ Xp__ R__ F__ L__ The spindle must be given rotation M3 when the cycle is started. The operations of cycle are

1.rapid-traverse positioning in the selected plane

2.– spindle orientation

– tool receded in the selected plane with values I, J, K (rapid traverse)

3.rapid-traverse movement to point R

4.– tool receded in the selected plane opposite to the values specified at I, J or K

(rapid traverse)

–spindle re-started in direction M3

5.boring as far as the point Z, with feed F

6.– spindle orientation (M19)

–tool receded in the selected plane with values I, J, K (rapid traverse)

7.-

8.-

9.rapid-traverse retraction to the initial point

10.– tool receded in the selected plane opposite to the values specified at I, J or K

(rapid traverse)

– spindle re-started in direction M3

Following from the nature of the cycle, point R is located, unlike in the previous instances, lower than point Z. This must be taken into account in programming the boring axis and addresses R.

154