2 Replies Latest reply on May 2, 2018 9:33 AM by Lorenzo Worang

# Can anyone help with rolling cable movement?

So basically I have a design of 2 driven rollers that move the cable horizontally in 2 directions, the one 'pulls' the cable the other one 'pushes'. So I have already made the assembly as seen in the picture below but I am trying to get the movement down to simulate and make an animation later on but not quite sure if it's even possible. The trick is that the rollers are in a specific phase with each other and as seen in the picture the length of contact with the cable is different for each roller. Also they're positioned(phase) in a way that only one of the driven rollers makes contact with the cable at a time. This is designed like this because you want the cable to be pulled back 5 mm in this case and pushed forward 8 mm, therefore the wire will go forward in a pulsating motion. So I tried some stuff with the Rack & Pinion mate, it's possible to give it a certain length per rotation which is useful but is there any possibility to let the rollers push and pull per one rotation? Oh and the 2 rollers are also connected to each other so they'll always stay in that phase. So yeah I've been stuck for a long time lol. Thanks for the help in advance!

• ###### Re: Can anyone help with rolling cable movement?

Are you allowing for the fact that when you pull a cable it has a stretch factor and when you 'push' a cable it has a slight compression factor as well as a possibility of arcing or 'snaking'.........

Dave.

• ###### Re: Can anyone help with rolling cable movement?

Hey, yea luckily I kinda accounted for it although it is quite a small marge... But the diameters of the 2 rollers are the same size but the one has smaller lengths of connection so there is a small time period where there will be no contact or stop time. So hopefully that kinda gives us some room for such factors. It should be big enough with lower speeds but we're aiming for some crazy rotations haha. Thanks for the input Dave!