Adaptive Roll Cover

[pball]

I'm trying to make what should be a simple assembly other than making one part adaptive. I'm trying to make a roll cover, think window shade. It's just a stand in part so it just only needs the cylinder the cover rolls up on, the stretched out fabric coming off it, and a bar at the end that the fabric is attached too.

I have a picture attached of a side view. I'm stuck making the fabric adaptive between the roll and the end piece. I want to have these three parts in an assembly which I could turn adaptive or flexible in my main assembly. Then the roll would be fixed and the end bar would be constrained to a moving part and the fabric would "roll in and out" as the end bar moves. Thanks for any help.

[mrattray]

Can you post the model files here?

[pball]

Well here is the assembly and parts. The fabric piece will probably have to be redrawn or something to make it work.

[royjohansen]

So, how did this go? I'm working on the exact same thing trying to figure it out now...

[pball]

Never figured it out. Gave up before wasting too much time, since I'd probably still be trying to make it work nearly 7 years later.

[JDMather]

Animate Parameters.

[johnsonshiue]

Hi Guys,

I don't believe there is a way to do that. The issue here is that there is no sketch constraint or body feature to allow such deformation. The sketch will have to change from a straight line to a spiral. The body will have to roll accordingly. I don't think Inventor can do it. I am happy to be proven otherwise.

Many thanks!

[WHolzwarth]

---

@royjohansen  schrieb:

So, how did this go? I'm working on the exact same thing trying to figure it out now...

---

Some years ago I've been playing with a LEGO Tow Truck and a crane hook animation. See attached video.

The fileset can be found at GrabCad:

https://grabcad.com/library/lego-technic-tow-truck-8462-1

The WMV there shows some other movements. Just now I've seen that the rotation of the drum in the GrabCad fileset probably needs to be inverted; I had to do that for the new video.

[admaiora]

@WHolzwarth  amazing work Walter!

[Daniel248]

I've modified the old models a little, and added linked parameters to make it work in Studio.

Attached is a small video and a P&G in ZIP, if anyone wants to "dissect".

(2020 format)

[Curtis_Waguespack]

Attached is a 2020 iLogic version of this, it contains a couple of rules that will allow you to drag the slider to roll/unroll it or click the play button to auto roll/unroll it... the roll diameter calculation is just sort of fudged to look about right and not truly calculated.

[WHolzwarth]

Good job, Curtis.

Here's the formula for the diameter:

https://rechneronline.de/rolle/