View Full Version : Digger

02 February 2006, 05:22 PM
Hi Just getting interested in rigging so I thought I'd start with something I guessed would be easy, "a diggers arm". However I'm finding it a bit more difficult than I thought. I know this is not technically a character but there's no forum for non character rigging so hopefully this is the right place to post this. I'm looking make both arms move and be controlled by 5 sliders, one for each of the hydraulics.

I've attached what I have. I wondering if anyone can help me out or point me in the direction of some tutorials. I know about the basics of linking objects and contraints but obviously not enough.

02 February 2006, 12:46 PM
This is the place to ask!

If you let us know what software you're using, and maybe a sketch of your joint placements or whatever could help us to understand exactly what you're trying to do a little better?

I'm guessing you want to be able to move the digger arm, and for the pistons to compress and extend with it?!?!

02 February 2006, 08:25 PM
OK thanks for getting back, I'm using 3DS MAX. I've decided to go back to something a bit more basic, I downloaded a rig for lightwave which uses the same principle that I need for the digger. I put a video of it working Here (

But I am trying to get it to work in max using IK. I think I don't totally understand how it works in lightwave, so trying to emulate it in max is proving difficult.

In lightwave the two piston parts are controlled by IK. The big piston null's rotation is bound to the big piston goal and the small piston null is bound to the small piston goal which can slide along the big cylinder. I seem to be able to get the small piston to move correctly in max but cannot see how the motion of the big piston is created.

I'm sure this is hard to make sense of, I'm struggling here to explain myself. I've posted this on the max only forum too as I think this might be a bit MAX specific.

02 February 2006, 10:21 AM
ok do this,


02 February 2006, 12:53 PM
Cheers for that eek, isn't annoying when you're struggle for a while with something and you find out it's really simple. For some reason I was avoiding using the look at constraint because I was planning to make the piston control the motion rather than moving the arm just pulls the piston. But this works perfectly.

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02 February 2006, 12:53 PM
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