Is it possible to create a metal ring with a variable diameter using segments?

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Discussion Overview

The discussion revolves around the feasibility of creating a metal ring with a variable diameter using segments. Participants explore the mechanics of such a design, including potential gaps that may arise when segments are pulled apart and the implications of those gaps on the overall functionality of the ring. The conversation includes considerations of alternative geometries that approximate a circle.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant proposes the idea of using segments to create a metal ring with a variable diameter, expressing concern about gaps that form when segments are pulled apart.
  • Another participant suggests searching for "camera iris" as a potential solution or inspiration for the design.
  • A participant expresses satisfaction with the "camera iris" suggestion and inquires whether the mechanism can be reversed to expand outward instead of inward.
  • Another participant acknowledges the possibility of creating an outward-expanding design, noting that it may resemble a polygon rather than a perfect circle, depending on the number of segments used.
  • One participant mentions that there are many unusual approximate solutions to the problem and suggests that identifying the specific application could lead to more relevant solutions being discussed.

Areas of Agreement / Disagreement

Participants generally agree on the concept of using segments to create a variable diameter ring, but there are multiple competing views regarding the feasibility of the design and the specific mechanics involved. The discussion remains unresolved regarding the best approach to achieve the desired functionality.

Contextual Notes

Limitations include the potential gaps created when segments are pulled apart, the dependence on the number of segments used, and the ambiguity surrounding the application of the proposed designs.

Who May Find This Useful

Individuals interested in mechanical design, engineering applications, or innovative solutions for variable geometry mechanisms may find this discussion relevant.

examorph
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I am interested to see if there is a way of creating a metal ring which has a variable diameter, the only way I imagine that this can be done is using segments which come together to form a circle, once pulled away the diameter changes however, the problem I face is that when the segments are pulled out, they leave a gap as shown here:
http://gyazo.com/bd38ce382a16a9f6a1739c42ad30d404
To fill this gap, additional segments would need to be manufactured and would defeat the purpose of having a variable diameter.

Is something like this even possible, if not a perfect circle, is there a way of doing this to get a varying geometry which is very similar to a circle? I am interested to see any ideas at all that anyone may have about this even if they are nothing to do with segment please share.
 
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google "camera iris"
 
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That was exactly what I was looking for, Thank you.

Just out of interest, can this be reversed? I mean rather than having a circle form on the inside is it possible to form the circle on the outside so that as the segments move it expands outwards?
 
examorph said:
That was exactly what I was looking for, Thank you.

Just out of interest, can this be reversed? I mean rather than having a circle form on the inside is it possible to form the circle on the outside so that as the segments move it expands outwards?

Never heard of one like that but seems to me it could be made. The "circle" would probably be more like a polygon, but the more segments used the less that would be the case.
 
There are many unusual approximate solutions to such a problem.
Maybe if you could identify the application it would be worth posting other solutions.
 

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