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-   -   Changing coil diameter (http://talk.craftweb.com/showthread.php?t=12549)

Franklin Sankar 02-25-2020 10:48 PM

Changing coil diameter
 
Anyone tried to rewind an element coil to make a bigger diameter. Say 1/4 in to 1/2 in.
Donít ask why. 😳😀
Franklin

Pete VanderLaan 02-26-2020 12:36 PM

Only once. It took therapy to recover. Don't ask what that cost.

Franklin Sankar 02-26-2020 03:56 PM

I believe you
Franklin

Richard Huntrods 02-27-2020 12:56 PM

If the coil has been heated even once, I'd say forget it. You could try and heat it again and uncoil it while hot, but it's a losing game for the most part.

If it is a 'just wound' coil, never heated, then you should be able to unwind the coil to a larger diameter if you are careful, but realistically it's probably better to just wind a new coil at the desired diameter.

Franklin Sankar 02-29-2020 06:45 PM

Thanks Richard.
Itís new. 14 g wire Not fired and stiff like hell to unwind. I am not trying to straighten just unwind to stuff more in the groves. Was thinking about wrapping tape on a needle nose pliers and slowly open up the coil. Easier said than done. I am Not strong enough.
I give up
Thanks
Franklin

Richard Huntrods 02-29-2020 08:47 PM

The problem with most metals is they will 'work harden' as they are formed. Taking wire and coiling it up probably does this to the wire (Kanthal?), making it much harder to rework - I don't know Kanthal so I can't say for sure, but quite possible, especially with what you say about trying to uncoil it.

If you do work harden metal, you need to heat and cool it according to a strict schedule to relieve the stress and return the material to a workable state. However, that schedule (and the various temperatures) is different for each metal.

I have no idea what you might have to do to Kanthal to make it maleable again, but as you say - sometimes better to chuck it and do another.

Brice Turnbull 03-18-2020 11:48 PM

Hi Franklin,
I am glad to read you gave up. Just to help you know you made the wise choice, I have tried this with 12 gauge wire. Does not work, will make you crazy if you keep at it too long.

Franklin Sankar 03-20-2020 06:24 PM

Lol. Yes itís madness.
Franklin


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