Cable and Pulley Routing help needed for Fitness Machine

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Discussion Overview

The discussion revolves around the design and mechanical configuration of a fitness machine involving multiple pulleys and cables. Participants explore the mechanical advantage and travel distance requirements for different parts of the machine, focusing on achieving specific resistance ratios.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • Edmond seeks expertise in cable and pulley systems for a fitness machine, offering a consulting fee for assistance.
  • One participant inquires about the specific type of expertise needed, suggesting that theoretical assistance may be available.
  • Edmond describes a requirement where one part of the machine needs to have half the travel distance of another, while maintaining a specific mechanical advantage (1/2 pound resistance equating to 1 pound at the weight stack).
  • A later reply questions the configuration of the cables in relation to the weight stack, noting that the outcome may differ based on whether the cables are directly attached or routed through a pulley.

Areas of Agreement / Disagreement

No consensus has been reached, as participants are still clarifying the requirements and configurations needed for the fitness machine.

Contextual Notes

Participants have not fully defined the assumptions regarding the pulley arrangements or the specific mechanics involved, which may affect the proposed solutions.

Edmond Daunte
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Hello,

I am trying to put together a fitness machine that used up to fifteen pulleys. Is there anybody here that is an expert in this field or knows someone who is? I am willing to pay a reasonable consulting fee if they can help solve my problem.

Thank you,

Edmond
 
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What kind of expert are you looking for?

If this is checking the theory behind the cable and pulleys, it should possible to help.

Cheers
 
Well I am ok with the concepts but not good at the exact cause and effect of cable and pulley mechanical advantage. I have a problem where one area of this fitness device needs half the travel of another area. Ideally the area with the desired half travel would have a mechanical advantage so that its for example 1/2 pound would be equal in resistance to 1 pound at the end of the front cable where the weight plates are.

So "B" needs to go half the distance as "A"

1/2 a pound at X needs to equal 1 pound at Y

The pulleys you see can be arranged in any way or more pulleys/cables added. Please help!

Thanks!
 

Attachments

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Hi there,

From your diagram, I can't see if the cables in A are attached directly to the weight stack, or if you want to hook them to a pulley. The result will be different in the two cases scenarios.
 

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