开云体育

Art

Many years ago we developed a general digitising package for
use
on machine tools, this package was able to capture data from
both
3D and 2D unknown forms.

As part of this package we developed standard macros which
resided
On the CNC controller and were used to capture the basic
data.

We had a macro for 2D shapes which was very effective :-

Initially the probe moves onto the profile and
takes its
first hit.

It then moves off the profile in a circular
move.

The probe continues on the circular move until
triggered
or it gets back to the initial point.

If it gets back to the initial point (very rare)
the circular movement
parameters are altered and the operation
repeated.

If the probe is triggered the XY point is sent
back to the PC and
the operation is repeated.

In this manner the probe will work its way round the profile
until it gets
back to the start point (within a preset tolerance).

The set of XY points can then be passed through a Curve Fit
routine
to produce a tangential profile.

The parameters of the macro can be varied depending on the
profile
to be captured.

Michael