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@Deck. You bloody legend. You fixed it. I can even get it to walk now. Just have to crank up the torque on the motors. Now to find the optimal angles and lengths, which I'll be doing mathematically, and now experimentally thanks to you. Yeh and that cylinder was from a old iteration. Not important. THANK YOU!

@jed Yeh I get that the torques involved are not ideal, but that's the point of modeling. To find the right lengths of the linkages to get it to shuffle along. But I can't even get it to be static as the connectors just act like Rubber, and not say a screwed in part. The whole thing should just stall the motors, and it should a least stand on it's legs. This is an example of it with motors. It just falls down. Motor_Linky Robot_0002.c4d

Hi, I made this simulation of a Uni project for a robot that moves with 4 bar linkages for each of it's legs. I made it interactive so I can change the lengths and angles, and it works well when the main body is static, but I can't let it move. I tried using a motor to run it, instead of a python script to just rotate the middle shaft, but it just breaks and falls apart. Can anyone help. Would greatly appreciate it. Oh, and at frame 0 the robot needs to be on the axis as I used some numbers to calculate lengths and angles that will change and break it if you move it. So I just moved the floor down. Cheers. Linky Robot_0006.c4d

@jed thanks for the attempt buddy. I was really just not having luck with driving it with a motor. It was buggy, and needed lots of torque, and things aren't connecting. I started again, I found sometimes dynamics breaks, and if I start again, it works again. But yeh your right about Grashof's Law, that's what my Unit is about. EGB321 Dynamics of machines. And the robot has a sneaky driving arm you can't see in that pic, sorry, so it's actually 2 4bar linkages. It's funny, I've been using Cinema 4D for simulating my projects in my ENG degree. They mention Solid Works, which is good, but with my years of experience in C4D i find it easier. Plus it's so much quicker to build with. And I get nice animations for my Video reports. Here's A Vid I did of my groups Soccer Robot if your interested. Anyway, I'm getting there. I have Built some Xpresso to be able to change arms length. Basically I need to make 2 Crank Rockers. I think I'll do what you did with the rotating Xpresso. The Motor seems buggy, and I needed to crank the torque to get it to work, and then it wouldn't. Here's the assignment for your interest. Cheers Assignment1_v2_1_.pdf

HI, I'm trying to animate a 4 Bar linkage robot. But I can't get the connector to rotate with the shaft. I'll need to also connect more, as you can see in the photo. What am I doing wrong. I had a version with a motor too, but that didn't work either. Linkage Robot_0003.c4d