HEIDENHAIN TNC 360 User Manual - Manual (Page 111)

5-27 TNC 360
5 Programming Tool Movements
Fig. 5.35: The pole is entered as CC
Fig. 5.36: Contour consisting of straight
lines with polar coordinates
X
Y
CC
PA
PR
IPA IPA
IPA
IPA
X
Y
Pol
CC
X
CC
Y
CC
5.5 Path Contours – Polar Coordinates
Polar coordinates are useful for programming:
• Positions on circular arcs
• Positions from workpiece drawings showing
angular dimensions
Section 1.2 “Fundamentals of NC” provides a
detailed description of polar coordinates.
Polar coordinates are marked with a P.
Polar coordinate origin: Pole CC
You can define the pole anywhere in the program before the blocks
containing polar coordinates. Enter the pole in Cartesian coordinates as a
circle center in a CC block.
Straight line LP
• You can enter any value from –360° to +360° for PA.
• Enter the algebraic sign for PA relative to the angle reference axis:
For an angle from the reference axis counterclockwise to PR: PA>0
For an angle from the reference axis clockwise to PR: PA<0