RTCP Function
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8.1 General
The RTCP function (Rotating Tool Centre Point) is used to continuously control the
machine movements to orient the tool with respect to the part by pivoting it around
its centre.
The machining programme contains the cartesian coordinates of the tool tip or point
of contact of the part reference system.
NUM has created an application able to process most cases by the RTCP function.
8.1.1 Control of Rotary Axes
Two cases can occur, depending on the control mode of the rotary axes:
- the rotary coordinates are programmed and associated with the cartesian
coordinates in the machining programme, in which case the mode is «programmed
RTCP» mode,
- the rotary coordinates are not programmed and the rotary axes are controlled
manually by handwheels or jogs. This mode is called «3/5 AUTO» (see the N/M
AUTO function in Chapter 9 below).
8.1.2 Processing Performed on the Axes
The processing performed on the axes is used to:
- continuously (depending on the travel of the rotary axes) correct the references
of the cartesian axes (X, Y, Z) to maintain the tool contact point on the programmed
path. This correction is carried out in both programmed RTCP mode and in 3/5
AUTO mode,
- make sure the dimensions of the cartesian axes (X, Y, Z) corrected by the RTCP
function remain within the machine travel limits. The check is made only in
programmed RTCP mode,
- analyse the overspeeds and overaccelerations caused on the cartesian axes (X,
Y, Z) by movement of the rotary axes to determine the optimum acceleration in the
path and possibly limit the programmed speed so that no axis is driven beyond its
maximum speed. This analysis is made only in programmed RTCP mode.
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