Pocket Milling - Roughing G845 - HEIDENHAIN CNC PILOT 640 User Manual

DIN/ISO programming | Milling cycles

Pocket milling - roughing G845

G845 – fundamentals
G845 roughs closed contours.
Choose one of the following plunge strategies, depending on the
milling cutter you are using:
Plunge vertically
Plunge at a pre-drilled position
Plunge in a reciprocating or helical motion
When plunging at a pre-drilled position, you have the following
alternatives:
Calculate positions, drill, mill—the machining process is
performed in the following steps:
Insert drill.
Calculate hole positions with G845 A1 .. or set the hole
position at the center of the figure with A2
Predrill with G71 NF..
Call cycle G845 A0 ... The cycle positions the tool above the
hole; the tool plunges and mills the pocket
Drill, mill—the machining process is performed in the following
steps:
Drill a hole inside the pocket with G71 ..
Position the milling cutter above the hole and call G845
A0 ... The tool plunges and mills the section
The parameters O=1 and NF must be defined.
If the pocket consists of multiple sections, G845 takes all the
sections of the pocket into account for drilling and milling. Call
G845 A0 .. separately for each section when calculating the hole
positions without G845 A1 ...
G845 takes the following oversizes into account:
G57: Oversize in X, Z direction
G58: Equidistant oversize in the milling plane
Program oversizes for calculating the hole positions and
for milling.
HEIDENHAIN | User's Manual smart.Turn and DIN Programming | 12/2017
4
425