HEIDENHAIN TNC 426 (280 476) Pilot - Manual (Page 8)

9
Fundamentals
Polar Coordinates
Dimensions in polar coordinates are referenced to the pole (CC).
A position in the working plane is defined by
• Polar coordinate radius PR = Distance of the position from the pole
• Polar coordinate angle PA = Angle from the angle reference axis to
the straight line CC – PR
Incremental dimensions
Incremental dimensions in polar coordinates are measured from the
last programmed position.
Programming polar coordinates
Defining Tools
Tool data
Every tool is designated by a tool number between 1 and 254 or, if
you are using tool tables, by a tool name.
Entering tool data
You can enter the tool data (length L and radius R)
• in a tool table (centrally, Program TOOL.T)
or
• within the part program in TOOL DEF blocks (locally)
Select the path function
Press the P key
Answer the dialog prompts