# How to model robotic wires behavior in solidworks

I'm trying to create a block or anything else in soildworks that I can move and see the compression of the lower wire further from the arm

Something like this

The example show just one joint but I want it for a long array of joints But I have no idea how to go about it

Can you give me a direction on how to do it?

The key point, is you need a flexible curve with a fixed length.

The simplest way to do this is with a style spline - you can add a dimension to the spline to define the length.

You can also then define the first and last construction lines to be perpendicular to the two sides of the joint, set opposing pairs of construction lines to be equal length, and set the length of the first, last, and centre points to control the minimum bend radius.

I have uploaded a .gif below showing how I set this up, I hope it's clear.

• Perfect, thanks Mar 13 at 10:07
• BTW - is there a way to restrict the max angle? Mar 13 at 22:09
• To put a limit on the rotation of the arm inside the sketch edit environment? Not easy, but possible with more construction lines. Can’t describe in a comment though! Mar 14 at 0:51
• I have a problem with the solution you suggested and I don't know how to fix it - I need the line to be straight when the arm scratched it, do you have an idea on how I can do this? From 90* bend to 180 straight line Mar 14 at 14:09
• You need to draw this out for me - it's not clear what you want, and certainly not clear how that would correspond to reality. It's not a good idea for wires to be perfectly tight! Mar 14 at 15:13

In the case you are describing, the cable should be anchored parallel to the beam. The length of the wire required to limit motion is self-evident from being a straight line - although you should ensure that you have compensated for stretch in the wire, and flex of its mounting under the forces involved.

Then, it's the same method to create a flexible cable that you can use to approximate a possible bent state

Of course, you can get more complicated with it by adding additional construction lines to the style spline:

Which best represents the behaviour of your specific cable is something you will have to test experimentally, really.

• Thanks brother, much appreciate Mar 14 at 18:28
• filedropper.com/kevlarwire Here is the .SLDPRT file if you want it. Mar 14 at 18:30
• Awesome, thanks! Mar 14 at 18:41
• Right so everything works BUT I didnt figure out how to define the sketch :\ Mar 15 at 17:28
• It's just missing an angle dimension on the bend - see here: i.imgur.com/fLV1Le1.png Mar 15 at 17:44