Overview

Task

The CNC controller calculates a path setpoint profile so that the programmed path contour can be travelled at a specific velocity. The individual NC axes are accelerated and decelerated at specified acceleration values. Which dynamic settings on a machine produce the best results with regard to machining time and path accuracy depends on the following influences, among others:

• Load capacity of the machine construction
• Machine vibration response
• Drive motor torque response
• Drive controller power limit

This function description describes the parameter definitions of the dynamic response of motion control.

When calculating the profile, the CNC takes into account every machine axis participating in the motion. The path velocity may have to be reduced so as to maintain the axis-specific velocity and acceleration values. The machine axis with the poorest dynamics and the largest relative path distance ultimately defines the maximum possible path velocity.

Effectiveness

The axis-specific dynamic characteristics are parameters that apply to a single machine axis. If several NC axes interact in the path compound (path mode), the axis with the weakest dynamics and the largest relative path distance defines the overall path dynamics.

Parameterisation

Dynamic variables are parameterised for every NC axis in the axis parameter list [AXIS].

The default type of the acceleration profile with the associated weighting effect are parameterised in the channel-specific parameter list [CHAN]. The specific additional dynamic parameters for spindle axes, for example the characteristic profile-controlled acceleration, are described in [FCT-S1].