Robot arm (aim, constraint) help in Maya

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  02 February 2013
Robot arm (aim, constraint) help in Maya

I'm relatively new to rigging in general and especially in Maya. I rigged a robot arm with shoulder armor in C4D last year and I'm trying to recreate the same sort of rig in Maya but having trouble.

Here is a reference video:

It's a simple rig with the arm being controlled by three controllers: clavicle/chest-shoulder chain, shoulder to wrist chain, and elbow.

I can't figure out how to get the shoulder armor to behave this way in Maya. In this C4D rig the shoulder geometry (and everything else down the chain) is controlled by the hexagon-indicated controller out to the side of the robot while it had had an Up-Vector constraint targeting one of the elbow bones with its X axis locked. this way the armor would follow the arm's pitch rotations but not rotate along Z axis.

I've been playing with the Aim constraint in Maya, with the first elbow bone as the driver and the shoulder armor geometry as the driven but am at a lost at how have it only rotate along the X axis.

Any tips? I hope I'm being clear enough
  02 February 2013
Hey ackguy,

Have you tried orient constraining it and then locking/ breaking connections to unwanted axis?
Zarvan Kotwal | my site
  02 February 2013
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