HEIDENHAIN CNC Pilot 4290 Description of the Y axis - Manual (Page 54)

Y Axis 54
Arc
When entering an arc, use the menu symbol to select the direction
of rotation and then assign dimensions to the arc. By selecting
between ”tangential/nontangential” you define the transition to
the next contour element.
Parameter ”end point of arc”
Y, Z: End point in Cartesian coordinates
Yi, Zi: Distance from starting point to end point in Y and Z
directions
P, α : End point in polar coordinates (reference angle α : positive Z
axis)
Pi, α i: End point polar, incremental. Pi: Linear distance from
starting to end point; Reference of α i: Angle between an
imaginary line intersecting the starting point and parallel to
the Z axis, and another line from the starting point to the
end point.
Parameter ”center of arc”
YM, ZM: Center
YMi, ZMi: Distance from starting point to end point in Y and Z
directions
PM, β : Center, polar (reference angle β : positive Z axis)
PMi, β i: Center polar, incremental. PMi: Linear distance from
starting point to center; Reference of β i: 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
Other parameters
Radius: Arc radius
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: Angle between preceding element and tangent in the
starting point of the arc
WN: Angle between tangent in arc end point and following
element
WV, WN:
■ The angle leads from the preceding/succeeding element
counterclockwise to the new element.
■ Arc as preceding/succeeding element: Angle to tangent.
4.1.3
Contours
in
the
YZ
Plane
(Side
View)
Example: Arc CCW (dimensioning of the end
point)
Example: Arc CCW (dimensioning of the center
point)
Y_4290BH.pm6 08.03.2005, 08:37 54