05.91 4 Programming of Motion Blocks
4.2.3 Helical interpolation
4.2.3 Helical interpolation
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The
“
Helical interpolation”
function when used with the SINUMERIK 880T requires
the 3D interpolation Option. The order code is: B61.
Three-axis helical interpolation
Helical interpolation is possible between 3 linear axes which are perpendicular to one another.
Helical interpolation involves programming a circular arc and a straight line perpendicular to the
end position of this circular arc in a single block. When the program is processed the motions
of the axis slides are coupled such that the tool describes a helix with constant lead.
The axis coordinates X, Y and Z must always be programmed.
If the plane and interpolation parameters defined in machine data are not identical, alarm 3006
(Wrong block structure) is triggered. The plane must therefore be selected first.
The axis for linear interpolation can be programmed either before or after the interpolation
parameters. If another axis is incorporated in the circular interpolation, the interpolation
parameter specified via machine data must be used for this axis.
The programmed feedrate is adhered to on the circular path rather than on the actual tool
path.
The axes for circular interpolation must be programmed first.
The required feedrate must be programmed before or in the helical block.
The programmed feedrate acts on the circular axes only, whilst control of the linear axes
synchronizes motions so that they reach their end point when the circular axes reach the circle
end point.
The maximum permissible speed of the axes used for interpolation is monitored, and the
feedrate is restricted when the speed limit is exceeded (i.e. V
prog
> V
max
).
© Siemens AG 1991 All Rights Reserved 6ZB5 410-0HD02 4–13
SINUMERIK 880, (PG)
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