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Extending Servo Wire Answered

I need to make a servo wire that extends approximately 4 feet and then retracts to a length of 18 inches or less. There is a risk of entanglement, so the less sag and less loose the wire, the better. One option would be to use coiled wire of the appropriate gauge, but a product such as this is expensive. What are some other options?

One idea that I had was to build a wire spool mechanism like that of a tape measure. From what I understand, a tape measure uses a constant force spring to somehow apply a retractive force to the actual measuring tape. Can anyone provide a more clear explanation of how a tape measure retracts? Does anyone have any ideas of how to implement this into a wire spool?

Other ideas on retracting a very long wire?

Thanks

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ThirdEarthDesign (author)2018-02-21

You could consider using CAT5e cable, it has 8 cores in twisted pairs and cheap retractable versions are available off-the-shelf:

http://cpc.farnell.com/pro-signal/psg90789/cable-r...

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rickharris (author)rickharris2018-02-21

in face isn't a link (URL at all)

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rickharris (author)2018-02-20

Something like and extendable key chain (search amazon) has the mechanism you want

https://www.amazon.co.uk/Heavy-duty-Retractable-Ch...

I have a mouse that works the same way - Only to about 1 mtr though.

https://www.amazon.co.uk/Sabrent-Travel-Optical-Re...

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seamster (author)2018-02-20

I can't speak to the idea of a spool mechanism, but have you considered turning straight wire into coiled wire? https://www.instructables.com/id/Make-Coiled-Wire/

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iceng (author)seamster2018-02-20

When do you think i can get off of the DNPP list = Do Not Post Pics list ?

Or be able to delete my vengeful comments ?

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iceng (author)iceng2018-02-20

US07108216-20060919-D00003.png

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iceng (author)iceng2018-02-20