HEIDENHAIN TNC 410 - Manual (Page 79)

66 6 Programming: Programming Contours
Circles and circular arcs
The TNC moves two axes simultaneously in a circular path relative
to the workpiece. You can define a circular movement by entering
the circle center CC.
When you program a circle, the TNC assigns it to one of the main
planes. This plane is defined automatically when you set the
spindle axis during a tool call:
Spindle axis Main plane
Z XY, also
UV, XV, UY
Y ZX, also
WU, ZU, WX
X YZ, also
VW, YW, VZ
You can program circles that do not lie parallel to a main
plane by using Q parameters (see Chapter 10).
Direction of rotation DR for circular movements
When a circular path has no tangential transition to another contour
element, enter the direction of rotation DR:
Clockwise direction of rotation: DR–
Counterclockwise direction of rotation: DR+
Radius compensation
The radius compensation must be in the block in which you move
to the first contour element. You cannot begin radius compensation
in a circle block. It must be activated beforehand an a straight-line
block or approach block (APPR block).
Pre-positioning
Before running a part program, always pre-position the tool to
prevent the possibility of damaging it or the workpiece.
X
Y
X
Y
CC
X
CC
Y
CC
CC
CC
DR–
DR+
X
Z
Y
6.2 F
undamentals of P
ath F
unctions