HEIDENHAIN TNC 426 B User Manual page 230

Before programming, note the following:
From the current position, the TNC positions the tool at
the starting point 1, first in the working plane and then in
the tool axis .
Pre-position the tool in such a way that no collision
between tool and clamping devices can occur.
Starting point in 1st axis Q225 (absolute value): Min.
point coordinate of the surface to be multipass-milled
in the main axis of the working plane
Starting point in 2nd axis Q226 (absolute value): Min.
point coordinate of the surface to be multipass-milled
in the secondary axis of the working plane
Starting point in 3rd axis Q227 (absolute value): Height
in the spindle axis at which multipass-milling is carried
out.
First side length Q218 (incremental value): Length of
the surface to be multipass-milled in the main axis of
the working plane, referenced to the starting point in
1st axis
Second side length Q219 (incremental value): Length
of the surface to be multipass-milled in the secondary
axis of the working plane, referenced to the starting
point in 2nd axis
Number of cuts Q240: Number of passes to be made
over the width
Feed rate for plunging 206: Traversing speed of the
tool in mm/min when moving from set-up clearance to
the milling depth
Feed rate for milling Q207: Traversing speed of the
tool in mm/min while milling.
Stepover feed rate Q209: Traversing speed of the tool
in mm/min when moving to the next pass. If you are
moving the tool transversely in the material, enter
Q209 to be smaller than Q207 If you are moving it
transversely in the open, Q209 may be greater than
Q207 .
Set-up clearance Q200 (incremental value): Distance
between tool tip and milling depth for positioning at
the start and end of the cycle.
HEIDENHAIN TNC 426 B, TNC 430
www.EngineeringBooksPdf.com
Y
N = Q240
Q226
Q218
Q225
Z
Q227
Example NC blocks:
71 Y L DEF 230 MULTIPASS MILLNG
Q225=+10 ;STARTNG PNT 1ST AXIS
Q226=+12 ;STARTNG PNT 2ND AXIS
Q227=+2.5 ;STARTING PNT 3RD AXIS
Q218=150 ;1ST SIDE LENGTH
Q219=75 ;2ND SIDE LENGTH
Q240=25 ;NUMBER OF
Q206=150 ;FEED RATE FOR PLUNGING
Q207=500 ;FEED RATE FOR MILLING
Q209=200 ;STEPOVER FEED RATE
Q200=2 ;SET-UP
Q207
Q209
X
Q206
Q200
X
UTS
LEARAN E
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