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No acceleration on Z axis in Helical Arc Move?

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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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