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6 thr ead and under cut cy cles – HEIDENHAIN SW 68894x-02 User Manual

Page 278

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278

Teach-in mode

4.6

Thr

ead

and

under

cut

cy

cles

Type of machining for technology database access: Finishing
All parameters that you enter will be accounted for—even if the

standard table prescribes other values. If the parameters I, K, W and

R are not defined, the CNC PILOT determines these parameters from

"FP" in the standard table (see "DIN 76—undercut parameters" on

page 579).
Cycle run

1

Approach workpiece from starting point

to the cylinder starting point X1, or

for the thread chamfer

2

Machine thread chamfer, if defined

3

Finish cylinder up to beginning of undercut

4

Pre-machine undercut, if defined

5

Machine undercut

6

Finish to end point X2 on plane surface

7

Return

Without return:

Tool remains at the end point on plane

surface

With return:

Retract and return diagonally to starting point

8

Move to the tool change point according to the G14 setting

B

Cylinder start chamfer (default: no start chamfer)

WB

First-cut angle (default: 45°)

RB

First-cut radius (default: no input = no element): Positive

value: First-cut radius, negative value = chamfer

G47

Safety clearance (see page 128)—evaluated only if "Omit

paths of rapid traverse" is active

MT

M after T: M function that is executed after the tool call T

MFS

M at beginning: M function that is executed at the

beginning of the machining step

MFE

M at end: M function that is executed at the end of the

machining step

WP

Displays which workpiece spindle is used to process the

cycle (machine-dependent)

Main drive

Opposing spindle for rear-face machining