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torsion spring, autodesk inventor

torsion spring, autodesk inventor

RE: torsion spring, autodesk inventor

It's best to provide a screen-capture of the Inventor file when you have a question.
I'm at home right now, so I can't open your IPT file.

Did you SWEEP the square profile along a spiral path?
Does the 90 degree bend refer to a termination at one of the ends where it is bent to engage upon the moving parts?
Was the bend made as part of the sweep, or a feature added later?
Does the radius of the bend exceed the thickness of the wire profile?

This is the AUTOCAD forum. I think you meant to put this in the INVENTOR forum: http://www.eng-tips.com/threadminder.cfm?pid=790

If you can't resolve your problem, you might want to red-flag this post (don't worry, site management is understanding about these kinds of mistakes)
Then re-post the question in INVENTOR and you'll probably get more responses faster.


RE: torsion spring, autodesk inventor

Hi, dho,

SparWeb is right about the posting place to the Inventor forum.
Also you have sent a part file made by one of the newest Inventor version, many people that could respond to you are not able to open it.

In your part file I see you're trying to make banded strip from coil end.
As the coils faces are not perpendicular to that strip, it is not available to connect them correctly.

1. I tried to cut a small amount of rotation and draw two sketches. One for the Sweep Profile it is square end of the coil and another for the Sweep Pattern:

2. And here how it looks Sweeped:


RE: torsion spring, autodesk inventor

A 'torsion spring' needs to have two radial tangs.

With one radial tang, it looks like you're trying to model a 'Wrap Spring'.

... which looks like, and basically is, a coil spring made of square wire, but is used very differently.

If so, it probably needs to be math- modeled differently, because axial forces and deformations are of zero interest in that application, and the restraints on the inner and/or outer diameters due to mating parts are important in a different way.

Mike Halloran
Pembroke Pines, FL, USA

RE: torsion spring, autodesk inventor

thanks for posting.
i used coil command. first in XY i drew a square, then coiled it. THEN in YZ, another square and extruded. LASTLY, fillet. there is a mis-match.
i can do your way, but, the tang needs to be on center, so, any off center cut will make the cross section not square but rectangular. a cut through the coil center, needs to do a calculation of the radius location.
i hope there is a way using 3D spiral line with two straight 3D lines, fillet first and sweep. but i could not line up the 3D spiral end with a plane.
thanks again.

RE: torsion spring, autodesk inventor

It is not difficult to catch the right locations for the radius and center as Inventor gives some Projections and Constrains tools.
I am not sure will you able to open here I dropping back your file modified:

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