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Fanuc GE has introduced the Smooth TCP function for its 30i and 31i-A5 Series CNC control systems, to achieve even better surface qualities and shorter cycle times.

This function is based on the Tool Centre Point function and compensates deviations in the tool orientation.

Smooth TCP also ignores redundant commands with regard to the tool centre-point position.

The starting point for Smooth TCP consists of five-axis machine programs generated by CAD/CAM systems in which the respective milling paths and direction vectors are established for a tool.

Even with 100 per cent reliable correspondence, part programs will contain discontinuities regarding the alignment of the tools.

Even when these deviations only amount to a few tenths of a degree, they give rise to compensating movements in the rotation axes, which in the end will result in slowed movement or even in the path movement being stopped.

The result is visible traces on the workpiece surface and loss of time, which was approximately 10 per cent on average in various tests.

In extreme cases, time savings of up to 44 per cent can be achieved with Smooth TCP.

Another positive side-effect is the minimisation of machine or tool wear due to avoidance of jerk in the motion profile.

With an activated Smooth TCP function, the CNC control system detects all the discontinuities in the tool position in advance.

Parameters are used to define a tolerance band, in which the control system makes appropriate corrections in the execution of the machine program and provides for a more uniform tool movement.

Tolerances of around +/-0.5 degrees are generally selected for finish machining.

It also pays to use Smooth TCP for roughing, since considerably shorter machining times can be achieved.

In this case the tolerance band can be set a little higher.

Smooth TCP gives better surfaces in less time

Fanuc GE has introduced the Smooth TCP function for its 30i and 31i-A5 Series CNC control systems, to achieve even better surface qualities and shorter cycle times.

This function is based on the Tool Centre Point function and compensates deviations in the tool orientation.

Smooth TCP also ignores redundant commands with regard to the tool centre-point position.

The starting point for Smooth TCP consists of five-axis machine programs generated by CAD/CAM systems in which the respective milling paths and direction vectors are established for a tool.

Even with 100 per cent reliable correspondence, part programs will contain discontinuities regarding the alignment of the tools.

Even when these deviations only amount to a few tenths of a degree, they give rise to compensating movements in the rotation axes, which in the end will result in slowed movement or even in the path movement being stopped.

The result is visible traces on the workpiece surface and loss of time, which was approximately 10 per cent on average in various tests.

In extreme cases, time savings of up to 44 per cent can be achieved with Smooth TCP.

Another positive side-effect is the minimisation of machine or tool wear due to avoidance of jerk in the motion profile.

With an activated Smooth TCP function, the CNC control system detects all the discontinuities in the tool position in advance.

Parameters are used to define a tolerance band, in which the control system makes appropriate corrections in the execution of the machine program and provides for a more uniform tool movement.

Tolerances of around +/-0.5 degrees are generally selected for finish machining.

It also pays to use Smooth TCP for roughing, since considerably shorter machining times can be achieved.

In this case the tolerance band can be set a little higher.

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