Rockwell Automation 8520 9/Series CNC Lathe User Manual

Page 659

Drilling Cycles

Chapter 26

26-33

Method I

This shift method is a single axis shift. The direction and axis for the

shift is set in AMP by the system installer or can be altered using the

drilling cycle parameter table. See page 26-38.

the direction of the axis is specified as + or -

the feedrate using this shift method is the programmed feedrate

the Q-word shift amount is always interpreted as a positive value;
a negative Q-word is not allowed

Method II

The direction of the shift using this method is programmed in the

boring cycle block. Program a shift amount for axes in the current

plane only (G17, G18, G19) by using these words:

I__ programs an X axis move.

K__ programs a Z axis move.

Follow the I- and K-words (modal during drilling cycles) with

incremental values in the block that programs the hole position.

When using Method II, remember:

if both axes in the current plane are to be shifted, specify both
words to move the axes

the move generated is a single linear move and is executed at rapid
traverse

The back boring tool moves at a rapid feedrate through the existing

hole to the depth designated by the R-word.

Once the designated depth is reached, the back boring tool shifts the

same distance but in the opposite direction as the previous shift (the

shift made in step 2).

After this shift, the programmer or operator must start the spindle or

live tool. The spindle or live tool must rotate in the clockwise

direction.

The control retracts the back boring tool at the cutting feedrate to a

level specified by the Z-word.