HEIDENHAIN CNC Pilot 4290 V7.1 Description of B and Y axes - Manual (Page 8)

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1.1 Basics
The Y axis
With a Y axis you can drill and mill a workpiece on its front, back and
lateral surfaces.
During use of the Y-axis, two axes interpolate linearly or circularly in
the given working plane, while the third axis interpolates linearly. This
enables you to machine slots or pockets, for example, with plane
floors and perpendicular edges. By defining the spindle angle, you can
determine the position of the milling contour on the workpiece.
The CNC PILOT supports part program creation with the Y axis in:
„ DIN PLUS
„ TURN PLUS contour definition
„ TURN PLUS working plan generation
The separation of contour description and machining also applies to
milling with the Y axis. Contour regeneration is not available for milling
operations.
Y axis contours are identified with section codes.
The graphical simulation shows the milling operation in the familiar
lathe, front, and surface windows, as well as in the "side view (YZ)."
The B axis
Tilted working plane
The B axis makes it possible to drill, bore and mill in oblique planes. To
make programming easy, the coordinate system is tilted in such a way
that you can define the drilling patterns and milling contours in the YZ
plane. The actual drilling or milling operation is then performed in the
tilted plane.
The separation of contour description and machining also applies to
machining operations in tilted planes. Contour regeneration is not
available.
Contours in tilted planes are identified with the section code
SURFACE_Y.
The CNC PILOT supports part program creation with the B axis in DIN
PLUS.
The graphical simulation shows the machining operation in a tilted
working plane in the familiar lathe and front windows, as well as in the
“side view (YZ).”