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Shoulder Screw Connection

Question asked by Uchenna Offor on Sep 14, 2018
Latest reply on Sep 16, 2018 by M. B.

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Hello all,

I currently have 2 aluminum bars that I want to join together with a shoulder screw to allow for controlled, NOT LOOSE, rotation. I'm hoping to borrow the idea of a frictional joint, that is, fasten the bars tightly with the screw. Am I on the right track? Or is there an easier way to do this that requires minimal modeling, parts and engineering?

Details of the aluminum bars:

6"L x 4" W x 1/2"T

6061-T6 Grade, Anodized (possibly)

Size (diameter) for shoulder screw: .375" (not sure yet though, will like recommendations)

Thanks.

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Dave Bear Sep 14, 2018 8:02 PM

Hi Uchenna,

Have you modelled anything so far?

Dave.

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Uchenna Offor @ Dave Bear on Sep 15, 2018 7:43 PM

I have only modeled one of the aluminum bars haha. Been busier than I thought, unfortunately.

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Uchenna Offor @ Rubén Rodolfo Balderrama on Sep 16, 2018 6:15 AM

The 2nd one is more like what I am trying to do except that I want it to be more controlled and stiffer rotation, so that if force isn't being applied, there will be no rotation, but when enough force is applied (sensible amount), there will be rotation.

There are only 2 bars in what I'm asking for, by the way, not multiple linkages.

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M. B. Sep 16, 2018 8:52 AM

... controlled, NOT LOOSE, rotation. I'm hoping to borrow the idea of a frictional joint, that is, fasten the bars tightly with the screw.

... more controlled and stiffer rotation, so that if force isn't being applied, there will be no rotation, but when enough force is applied (sensible amount), there will be rotation.

No one can possibly know specifically what this means or how to design it so that it works the best way for you. Also, you might want to research what happens when an aluminum part with minimal clearance rotates on a steel shoulder screw.

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5 Replies

Dave Bear Sep 14, 2018 8:02 PM
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Hi Uchenna,

Have you modelled anything so far?

Dave.
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- Uchenna Offor @ Dave Bear on Sep 15, 2018 7:43 PM
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  I have only modeled one of the aluminum bars haha. Been busier than I thought, unfortunately.
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Rubén Rodolfo Balderrama Sep 15, 2018 10:37 PM
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Wich one?
Understanding Universal Joint - YouTube
solidThinking Inspire 2018 New Features: Friction for Rigid Joints - YouTube
STRAIGHT LINE MECHANISMS - YouTube
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- Uchenna Offor @ Rubén Rodolfo Balderrama on Sep 16, 2018 6:15 AM
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  The 2nd one is more like what I am trying to do except that I want it to be more controlled and stiffer rotation, so that if force isn't being applied, there will be no rotation, but when enough force is applied (sensible amount), there will be rotation.
  
  There are only 2 bars in what I'm asking for, by the way, not multiple linkages.
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M. B. Sep 16, 2018 8:52 AM
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... controlled, NOT LOOSE, rotation. I'm hoping to borrow the idea of a frictional joint, that is, fasten the bars tightly with the screw.
... more controlled and stiffer rotation, so that if force isn't being applied, there will be no rotation, but when enough force is applied (sensible amount), there will be rotation.

No one can possibly know specifically what this means or how to design it so that it works the best way for you. Also, you might want to research what happens when an aluminum part with minimal clearance rotates on a steel shoulder screw.
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Shoulder Screw Connection

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