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Thread milling/countersinking (cycle 263) – HEIDENHAIN iTNC 530 (340 49x-04) User Manual

Page 389

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HEIDENHAIN iTNC 530

389

8.5 Cy

cles f

o

r Dr

illing, T

a

pping and Thr

ead Milling

THREAD MILLING/COUNTERSINKING
(Cycle 263)

1

The TNC positions the tool in the tool axis at rapid traverse FMAX
to the programmed set-up clearance above the workpiece surface.

Countersinking

2

The tool moves at the feed rate for pre-positioning to the
countersinking depth minus the set-up clearance, and then at the
feed rate for countersinking to the countersinking depth.

3

If a safety clearance to the side has been entered, the TNC
immediately positions the tool at the feed rate for pre-positioning
to the countersinking depth.

4

Then, depending on the available space, the TNC makes a
tangential approach to the core diameter, either tangentially from
the center or with a pre-positioning move to the side, and follows
a circular path.

Countersinking at front

5

The tool moves at the feed rate for pre-positioning to the sinking
depth at front.

6

The TNC positions the tool without compensation from the center
on a semicircle to the offset at front, and then follows a circular
path at the feed rate for countersinking.

7

The tool then moves in a semicircle to the hole center.