4 axes synchronisation and move

[eutak]

I have to synchronise 4 axes with Labview Motion. Unfortunately the vector space is only about 3 axes.
How can I synchronise the axes?
How can I make this 4 Axes Move?

Thanx

[Jochen]

Adding more than 3 axes to a vector space doesn't make sense as it wouldn't be mathematically possible to define a unique vector move with more than 3 axes (overdetermined system).
Still there are several options to coordinate more than 3 axes with the 7344.
First you can simply start all axes simultaneously with a single call to Start Motion.flx.

If you need a higher level of synchronisation then you should use contouring. You could define two vector spaces with two axes each. Then you need to calculate the position arrays for each vector space, dowonload them to the buffers on the board and start the two contouring moves simultaneously.
In contouring mode the time to move the axes from one position in the position array to the next is always constant. Thus y
ou can rely on the fact that all axes reach the positions with corresponding indices in the arrays at the same time.

Best regards,

Jochen Klier
National Instruments Germany

[eutak]

Thanx for your answer.

The application has 4DoF (rotative x,y,z and translative in z). The test stand is to test shear stresses on a testee.
The testee is fixed at the bottom on a construction that is able to rotate in all axes (x,y,z). The top of the testee is fixed by a translative changeable axe (z). So the testee can not just be tested about expansion in all axes (by rotating) but also can be squeezed in the z axe.

The system should be able to control all 4 axes either independently or combined (all together or some of them).

What is the best solution for their synchronisation? The solution you told me with the two vector spaces and tables or a Master Slave System or even others.

The Application will run on a PXI computer and will also acquire Da
ta on a DAQ card.

Thanx for your response