HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 128)

112 6 Programming: Programming Contours
6.5 P
ath Cont
ours — P
olar Coor
dinat
es
6.5 Path Contours—
Polar Coordinates
With polar coordinate you can define a position in terms of its angle
H and its distance R relative to a previously defined pole I, J. See
section ”4.1 Fundamentals of NC.”
Polar coordinates are useful with:
■ Positions on circular arcs
■ Workpiece drawing dimensions in degrees, e.g. bolt hole circles
Overview of path functions with polar coordinates
X
Y
X=I
Y=J
Tool movement Function Required input
Straight line at rapid traverse G10 Polar radius, polar angle of the straight-line
end point
Straight line at feed rate F
G11
Circular path in clockwise direction G12 Polar angle of the circle end point
Circular path in counterclockwise direction G13
Circular path corresponding to G15
active direction
Circular path with tangential G16 Polar radius, polar angle of the circle end point
connection to previous contour element
Zero point for polar coordinates: pole I, J
You can set the pole I, J at any point in the machining program,
before indicating points in polar coordinates. Set the pole in the
same way as you would program the circle center.
ú Enter Cartesian coordinates for the pole, or if you
want to use the last programmed position, enter
G29.
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