What are the constraints for this case?

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1

Hi all 

I want to put this blue element along the tube between the parking lots. What constraints do you think I have to put in order for it to slide along the tube?

Thank you in advance for your help.


clamp.jpg
2

Hello

I would say coincidence of the tube path with the center of the clamp holes, but your tube will go through the clamp clamp without deformation.

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3

Hello

The other solution is to put tangent constraints.

The only problem is that often the tangent stresses are capricious if you move the parts. If it's static, I'd say tangent stress between the edge of the hole and the outside of the tube.

But if the tube is curved, it prevents the part from sliding down, which tends to make the eel.

I prefer the proposal of @Sylk 

In fact it depends on how you built your tube (if you did a sweep with a spline it's perfect. So the best thing is to take two points in the center of the holes on your blue piece on each side of the hole  and you make a coincidence constraint in the center of the hole and the spline line of your tube.

This works if the tube is curved or twisted like in my example.

I'm in SW 2020. If you have a previous version, tell me, I'll make you a mini-vidéo_tuto

Kind regards

 


coulissage_sur_un_tube_.zip
coulissement_sur_un_tube.jpg
5 Likes
4

Hello@tous 

I think it's much more complicated than it seems, personally I might be able to achieve the constraint in defined positions but over the whole length it seems to me that it's not possible:)

Tension constraints, on curves (sewing surface) at the level of the holes can work, but it gets complicated with the thickness of the clamp, also the presence (or not) of contact with the tweezers depending on the curvature and twisting of the tube. 

That said, SW has a powerful contact motor on the SW-motion side but it will be limited to a motion study and not to the stress level ;) 

1 Like
5

maybe this will suit you (SW 18)

Zozo I can't open the file, so sorry if it's already offered:) 


assembly1.sldasm
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6

Thank you all for your help, I'll try all of this.

@zozo: yes sorry, I can't open your file, we are still under SW2018.

I'll keep you posted.

Once again, a big thank you to all.

7

Thank you Zozo and Lynk. 

I made your solutions with the marbles/ dots. I hadn't thought of it;)

Once hidden , that's it.

 

 


clamp_final.jpg
8

Hi all

@Lynk why did you add marbles? because using the sketch point + the sweep curve seems to work.

Kind regards.

1 Like
9

Hello@tous 

Indeed Pierre, the tube passages seemed oblong to me, I imagine that it is in order to allow a certain freedom and flexibility for the  tube, so the average line of this tube is no longer constrained with the center of the hole circles but rather must slide along the groove, So the intersection of the tube curve with that of the groove is ensured by a new component with the advantage of ease of editing constraints by selecting the ball in the graphical view, without having to look for a component (empty containing only one point) in the assembly tree ;)


clamp.jpg
capture_02a.png
capture_03a.png
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10

Hi all

@Lynk thank you for your explanation, I hadn't seen the subtlety of the sliding in the oblong.