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appended answer 327662 as supplemental

Rigging a robotic arm with IK Armature and a always pointing down bone

I'm trying to rig a robot using this armature with IK constrain. The behavior should be:

  • Base: rotates only on Y (bone) axe.
  • Arm 1: rotates only on X (bone) axe.
  • Arm 2: rotates only on X (bone) axe.
  • Point down: Automatically points down (stays always perpendicular to the floor). And rotates with Arm 2. Basically it has to copy "Base" bone but inverted.

How can I do it??

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The solution with the help of Gordon Brinkmann. Thank you.

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