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rm�ller4-Participant
4-Participant
May 3, 2016
Question

Spiral assembly/pattern of chain

  • May 3, 2016
  • 1 reply
  • 1673 views

Hello again community

I would like to make an assembly of coiled roller chain. When rollin, I found out it makes "archimedean spiral" shape.

I was able to create curve of desired shape and somehow place some points on it from YouTube tutorial, but its kinda hard to complete it.

To describe issue in detail:

I have this assembly of one piece of roller chain (pin constraint in middle)

Then I was able to do this

Double point constraint which should work then as a reference of pattern. But the pattern fails and does not fill the spiral. Second issue is that I want those empty holes attached into previous pin. Of course im open to another solutions.

The definition of issue is to simulate 2 meters of 6B 8187 DIN roller chain. P=9.525mm so number of pieces is 210.

Thank You for any advices or solutions.


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1 reply

P
psobejko1-Visitor
1-Visitor
July 19, 2016

Probably your chain links that have fixed distance between the pins do not fit the patterned along the curve points.

These points along the curve patterns produce nice looking figures, but the geometry is plain wrong, because the point pattern is based on along-the-curve distances - whereas in reality it should be based on a chordal length.

It shouldn't be difficult, just tedious to assemble the 210 links using slot constraints.  Use of mapkey and repeat function should speed up the task considerably.

If you could attach your model, I could get you started.  But I hope you look in to the other threads on this forum - the moveable cable-carrier assembly made by Antonius Dirriwachter comes to mind: Mechanism flexible wire tray issue, similar to a chain

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