Re: [ST] Electrics

[Andrew Bell <abell@xxxxxxxxxxxxxxxx>]

Dammit Jim, I'm a technician not an engineer!!!

thanks for straightening that out!

At 08:24 AM 9/28/01 -0400, you wrote:
>Copper is annealed by heat. Bending or stressing embrittles/hardens it.
>
>That's why you heat copper to reuse it after having distorted crystaline
>structure by stressing (such as for oil drain plug). The heating  recovers
>crystaline structure distorted by bending/stress..
>
>Copper will embrittle/harden when subject to "wear" (i.e.
>bending/stressing). But heat cycling (annealing) as a general rule softens
>(there are some specialty "pure" copper alloys that behave differently).
>
>Copper might be a poor choice for heated clothing - especially when compared
>to the Nichrome. But not from the properties associated with heating/cooling
>cycles......
>
>Just my $.02
>
>Charlie McCullough
>tz250 WERA #90
>Lottsa Ducs
>Triumph ST
>
>-----Original Message-----
>From: Andrew Bell <abell@xxxxxxxxxxxxxxxx>
>To: ST@xxxxxxxxxxxxxx <ST@xxxxxxxxxxxxxx>
>Date: Thursday, September 27, 2001 11:11 AM
>Subject: RE: [ST] Electrics
>
>
> >It's my understanding that as the copper is subjected to heat/cool cycles
> >it will work harden or become brittle. When you add in the fact that the
> >wire is in clothing, that will be scrunched, twisted and subjected to wear
> >the odds of failure increase over its use in a static design.
> >Nichrome is designed for not becoming work hardened when operated within
> >its spec's, is rather springy and will hold up to 'wear' in clothing and
> >the like.
> >
> >As usual YMMV,
> >
> >
> >At 04:17 PM 9/26/01 -0700, you wrote:
> >>Can you explain why and how copper would wear out? If it makes any
> >>difference, its silver coated copper wire, and is sold as high-temp wire.
>I
> >>see no reason why it would break, as it is very flexible.
> >>
> >>Thanks,
> >>
> >>Chris Strizver
> >>
> >>  -----Original Message-----
> >>From:   owner-st@xxxxxxxxxx [mailto:owner-st@xxxxxxxxxx]  On Behalf Of
>Andrew
> >>Bell
> >>Sent:   Wednesday, September 26, 2001 12:45 PM
> >>To:     ST@xxxxxxxxxxxxxx
> >>Subject:        RE: [ST] Electrics
> >>
> >>you really might want to stay with nichrome wire , copper won't give you
> >>longevity. There are also carbon fibre weave heating elements available. I
> >>don't have those sources handy though.
> >>
> >>
> >>At 11:55 AM 9/26/01 -0700, you wrote:
> >> >The copper wire that I got is tephlon coated for lower voltage heat
> >> >applications. Maybe get some of this instead?
> >> >
> >> >-Chris Strizver
> >> >
> >>
> >>Andrew Bell, Test Technician
> >>Mixed Signals/ULTECH
> >>
> >>e-mail: abell@xxxxxxxxxxxxxxxx
> >>Tel: (203) 758-8667
> >>Fax: (203) 758-8693
> >>Web:www.mixedsignals.com , www.ultechvideo.com
> >>
> >>
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> >
> >Andrew Bell, Test Technician
> >Mixed Signals/ULTECH
> >
> >e-mail: abell@xxxxxxxxxxxxxxxx
> >Tel: (203) 758-8667
> >Fax: (203) 758-8693
> >Web:www.mixedsignals.com , www.ultechvideo.com
> >
> >
> >     *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *
>*
> >      The ST/RS Mailing list is sponsored by Jack Lilley Ltd.
> >          http://www.TriumphNet.com/st/lilley for more info
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Andrew Bell, Test Technician
Mixed Signals/ULTECH

e-mail: abell@xxxxxxxxxxxxxxxx
Tel: (203) 758-8667
Fax: (203) 758-8693
Web:www.mixedsignals.com , www.ultechvideo.com


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