3 dr illing cy cles – HEIDENHAIN TNC 410 User Manual

Page 139

8 Programming: Cycles

126

DRILLING (Cycle 200)

1 The TNC positions the tool in the tool axis at rapid traverse FMAX

to the set-up clearance above the workpiece surface.

2 The tool drills to the first plunging depth at the programmed feed

rate F.

3 The TNC returns the tool at FMAX to the setup clearance, dwells

there (if a dwell time was entered), and then moves at FMAX to
the setup clearance above the first plunging depth.

4 The tool then advances with another infeed at the programmed

feed rate F.

5 The TNC repeats this process (2 to 4) until the programmed total

hole depth is reached.

6 At the hole bottom, the tool is retraced to set-up clearance or —

if programmed — to the 2nd set-up clearance in rapid traverse
FMAX.

Before programming, note the following:

Program a positioning block for the starting point (hole
center) in the working plane with RADIUS
COMPENSATION R0.

The algebraic sign for the depth parameter determines
the working direction.

Set-up clearance Q200 (incremental value): Distance
between tool tip and workpiece surface.

Depth Q201 (incremental value): Distance between
workpiece surface and bottom of hole (tip of drill
taper)

Feed rate for plunging Q206: Traversing speed of the
tool during drilling in mm/min

Plunging depth Q202 (incremental value):
Infeed per cut The TNC will go to depth in one
movement if:

■

the plunging depth is equal to the depth

■

the plunging depth is greater than the depth

The depth does not have to be a multiple of the
plunging depth.

Workpiece surface coordinate Q203 (absolute value):
Coordinate of the workpiece surface

2nd set-up clearance Q204 (incremental value):
Coordinate in the tool axis at which no collision
between tool and workpiece (clamping devices) can
occur.

Q200

Q201

Q206

Q202

Q210

Q203

Q204

8.3 Dr

illing Cy

cles

Example NC blocks:

7 CYCL DEF 200 DRILLING

Q200=2

;SET-UP CLEARANCE

Q201=-20

;DEPTH

Q206=150

;FEED RATE FOR PLUNGING

Q202=5

;PLUNGING DEPTH

Q210=0

;DWELL TIME AT TOP

Q203=+0

;SURFACE COORDINATE

Q204=50

;2. SET-UP CLEARANCE