HEIDENHAIN CNC Pilot 4290 V7.1 - Manual (Page 406)

406
6.5 Cont
ours of Finished P
a
rt
s
Circular element
This function defines a circular arc.
Parameters
End point of arc
X End point in Cartesian coordinates
Z End point in Cartesian coordinates
Xi Distance from starting point to end point
Zi Distance from starting point to end point
a End point in polar coordinates (reference: positive Z axis)
P End point in polar coordinates
ai End point polar, incremental (for reference of angle ai see
illustration)
Pi End point polar, incremental (linear distance from starting
point to end point)
Center of arc
I Center point
K Center
Ii Distance from starting point to center point
Ki Distance from starting point to center point
b Center point in polar coordinates (reference: positive Z axis)
PM Center point in polar coordinates
bi Center point polar, incremental (angle between an imaginary
line intersecting the starting point and parallel to the Z axis,
and another line from the starting point to the center point)
PMi Center point polar, incremental (PMi: linear distance from
starting point to center point)
Other parameters
R Arc radius
Tangential/nontangential: Specify the transition to the
next contour element
WA Angle between positive Z axis and tangent in starting point of
arc
WE Angle between positive Z-axis and tangent in end point of arc
WV Counterclockwise angle between preceding element and
tangent in starting point of arc. If the preceding element is an
arc: Angle to the tangent.
WN Counterclockwise angle between tangent in arc end point
and following element. If the following element is an arc:
Angle to the tangent.