Siemens SINUMERIK 828D Manual page 90

3.5
LEAD and TILT
90
Important functions for 3- to 5-axis machining
B
© Siemens AG All rights reserved SINUMERIK, Manual, Mold-Making with 3- to 5-Axis Simultaneous Milling
The resultant tool orientation is determined
from:
1
Path tangent
Surface normal vector
Lead angle LEAD
Tilt angle TILT at end of block
A
LEAD describes the angle between the sur-
face normals and the new tool orientation in
the plane set up by the path tangent and the
surface normals
The tilt angle corresponds to a rotation of the
2
tool in the plane perpendicular to the surface
normals .
2
The lead angle is often used to orient the tool
at a fixed setting angle to the machining plane.
This increases the cutting performance. For
example, a ball mill touches the surface to be
machined precisely with the tool tip when the
orientation is perpendicular. However, the
rotation and therefore the cutting speed is 0 at
this point of the milling cutter.
The following program sequence corresponds
approximately to that shown in the graphic.
N10 TRAORI
N20 G1 X=0 Y0 A3=0 B3=0 C3=1
N30 ORIPATH
N40 X10 LEAD=30 TILT=10 C5=1
A
B
1
2
.
1