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No acceleration on Z axis in Helical Arc Move?
Jeff_A
Member
03-27-2015 03:16 PM
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Hello-
I'm using the Motion Assitant's Arc Move functions to create an helical motion, X/Y arc and Z linear.
When I plot the resulting postion arrrys it appears that the Z axis is not using the motion contraints (motion is linear with no ramps).
I've plotted a 3D move using a Straight Line Move and it shows acceleration (as you would expect).
I've attached modified versions of the Arc and Stragiht Line move examples - position plots highlighted..
Any thoughts on how to get proper accelerations out of the Z axis for an arc move?
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nikale
NI Employee (retired)
03-30-2015 04:08 PM
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Hi,
I'm a bit confused on your goal. You mentioned that you're trying to create a helical motion, X/Y arc and Z linear; it seems that the Arc Move.vi attached is demonstrating that. Could you elaborate a bit on what you mean by the proper accelerations out of the Z axis as well?
Kale W.
Applications Engineer
National Instruments
http://www.ni.com/support
03-30-2015 09:44 PM
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Yeah, my bad - I was confusing the curved X vs Time with the acceleration - the curve is obviously a sineusoid which is what you would expect from a circle.
The Z is linear as you would also expect. Switching the plots to Acceleration (which I thought I had set) shows the accelartion in X/Y and Z.
One follow on question though - how do you use the Motion Assistant VI's exactly?
I have the profiles that I want but not sure how to input them into the 73xx motion hardware, confused with what to do with the result of these VI's - how to get them into the motion hardware..
If you create an LabView VI from Motion Assitant it doesn't use the "MA" VI's from the Motion Assitant sub-menu, it appears to create everyting using traditional flexmotion subvi's.
nikale
NI Employee (retired)
03-31-2015 05:34 PM
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Hey, not a problem glad it got figured out. In regards to using the Motion Assistant VI I've attached some links below as agood starting points.
Motion Assistant:
http://sine.ni.com/psp/app/doc/p/id/psp-489/lang/en
Fundamentals of Motion Control:
http://www.ni.com/white-paper/3367/en/
I hope this helps, good luck!
Kale W.
Applications Engineer
National Instruments
http://www.ni.com/support
