Circular interpolation in NI motion controllers

[Giridhar_Rajan]

Hi all,

This is a question for all the experienced motion control programmers using NI's motion controllers with LabVIEW. This is about circular interpolation. NI provides a VI for making a circular arc. Now, The issue is that this VI takes in angles instead of co-ordinates. For any user who wishes to give a command to a two axis system, visualizing something in terms of angles is very difficult. Also having an interpolation command in terms of angles is unconventional for a motion controller. It should always and always be in terms of co-ordinates. Why has NI gone for this unconventional approach for such a simple feature and how can I suggest this necessary improvement to NI.

Regards,

Giridhar Rajan

Automation Engineer, Design

Cruiser Controls

Mumbai, India

[s_a_s]

Giridhar,

As you noted there are numerous ways to calculate arc moves and in the development of our algorithms NI chose to use angular notation to characterize a circular arc move.  I would agree with you completely that it would be very useful to have a function that would take coordinates instead of angles to calculate a circular arc move.  National Instruments is always interested in receiving feedback on our products and welcome them as part of our dedication to continual improvement.  I will file this product suggestion through our channels here and would request that you also submit a product suggestion.  You can do so by going to ni.com and clicking on the gray "Contact NI" button and filling out the product feedback form.   Thank you for your time and for this valuable suggestion.

Regards,

[Giridhar_Rajan]

Hi S.A.S,

Thanks a lot for the reply. I'll fill up the product feedback form.Thanks again.

Regards,

Giridhar Rajan

Automation Engineer,  Design

Cruiser Controls

Mumbai, India