How Can I Ensure Constant Tension on a Bobbin with an Electric Motor?

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Discussion Overview

The discussion revolves around designing a mechanical system to ensure constant tension on a bobbin while winding wire, using an electric motor that provides a constant rotational speed. The context includes considerations of varying wire speeds from an extrusion machine and the need for adjustable tension in the winding process.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant seeks a simple mechanical solution to maintain constant tension on a bobbin while winding wire, noting the challenge posed by varying speeds from an extrusion machine.
  • Another participant suggests looking into fishing reel mechanisms as a potential reference for maintaining tension, questioning the criticality of constant tension.
  • A later reply clarifies the terminology used, confirming that the motor provides a constant speed and emphasizes the need for a system that can adapt to the varying speed of the wire from the extrusion machine.
  • One participant expresses uncertainty about the required precision of the tension and suggests that having some slack might help accommodate variations in extrusion speed.
  • The original poster indicates a preference for a self-regulating system that can disconnect if excessive tension is applied, while also noting their limited technical background as a second-year engineering student.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the best approach to achieve constant tension, and multiple competing ideas regarding potential solutions and mechanisms remain present.

Contextual Notes

Participants mention the need for adjustable tension and the complexity of the system, indicating that the discussion may be limited by the original poster's technical knowledge and the lack of specific requirements for tension precision.

Who May Find This Useful

Individuals interested in mechanical design, engineering students, and those exploring practical applications of tension regulation in winding systems may find this discussion relevant.

brout
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Here's my main problem to concieve a bobbin machine...

I've got an electrical motor which provides a constant rotating vitess.. and i want, in the end, to make the bobbin rotating and assuring a constant tension on the wire. If you have any idea of a simple mechanical system to do that... thanks ;)

I don't know if that's clear enough.. first sorry for the possible english mistakes ;) .. then i haven't totally understand myself :))

Thanx anyway...
 
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Ok, from what I can gather you are trying to wind string onto some kind of spindle (I can't say I know what you mean by a vitess). Is the bobbin going to be rotating at constant speed?

How critical is it that the tension is constant? You might want to have a look at things like fishing reels. Try the Shimano website, I seem to recall it was good for technical info about bike components.
 
Thx for the information...
just to be clearer i'll try to explain the problem more precisely.
So, as you guessed, i meant that a constant rotating speed (instead of vitess :S) is provided by the motor. But the wire arrives from an extrusion machine with a certain speed (maybe not constant). Then without any specific system the tension will depend on this speed and the radius of the reel. Here's the problem...
I've eard that a simple system exists (like one used in magnetopones...) but i can't find anything about it..
 
Ah, you meant speed, as in the french 'vitesse', I get it...

How tightly does the wire need to be wound on the reel? Would having some slack between the drum and the extrusion machine provide enough tension, this would also allow for the extrusion speed not being constant.
 
well.. there's no real precision about the tension.. only that it also have to be reglable, so it might have to be wound tightly i presume.
As far as I've understand my problem :) I need something that regulates itself, like something disconnecting when it is forcing too much.. but it's quite confused in my mind as you may have seen.

Also I'm only in a second year of engineer school, so I'm not looking for too evolved technical system...
 

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