Description

An oscillating axis motion is required in certain machining technologies, e.g. grinding, and this is executed mainly independently of a path motion.

This motion referred to below as an "oscillating motion" is executed by the tool with periodic reversal across the workpiece.

In the strict physical sense of the word, a typical oscillating motion is sinusoidal. It must be borne in mind that, when the term “oscillating motion” is used for the periodic reversal motion described in this section, the timing of the motion is not generally sinusoidal.

This is also not intended since in typical grinding work, the relative velocity between the disc and the workpiece should be constant, at least during tool engagement.

An oscillating axis during grinding is presented in the figure below as an example. The workpiece is machined by superimposing the oscillating X motion on positioning motions in the Y and Z axes.

Grinding with an oscillating axis
Grinding with an oscillating axis

Description of parameters

An oscillating motion can be described by the following parameters in addition to the profile type which defines the velocity curve in the dynamic phase.

vosc:
Tosc:
fosc:
p1:
p2:
td1:
td2:
sexc:

Oscillation feed rate
Oscillation period
Oscillation frequency (1/ Tosc)
Oscillation reversal position 1
Oscillation reversal position 2
Waiting/deceleration time at oscillation reversal position 1
Waiting/deceleration time at oscillation reversal position 2
Oscillation excursion

        

The time and path diagrams below explain the parameters:

Oscillating motion in the time range with linear slope profile
Oscillating motion in the time range with linear slope profile
Oscillating motion in the time range with non-linear slope profile
Oscillating motion in the time range with non-linear slope profile
Positioning procedure with pendulum movement
Positioning procedure with pendulum movement

Characteristics

Notice

notice

After an oscillating motion is deactivated, the motion is always stopped at oscillating position 2 .