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N Cook
Guest
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 Posted:
Fri Feb 04, 2005 12:23 am Post subject:
Coil winding back tension versus SWG/AWG table ? |
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Cannot find any on the web.
Easy enough to determine
the ulimate tensile strength of a given length of copper wire
but is the ideal back tensiom while winding say 1/5
of that UTS or some other factor/s ?
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sofie
Guest
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| Posted:
Fri Feb 04, 2005 3:01 am Post subject:
Re: Coil winding back tension versus SWG/AWG table ? |
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N Cook:
1/5 nts is way too high......
For most rf coils, torroids, transformers, etc..... 5% of NTS is adequate...
especially for soft drawn enamel insulated copper.
If you are doing motor armature windings or other rotating coils that will
be subject to centrifugal forces, the 10% number works fine for most of
these applications.
What exactly are you doing?
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
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"N Cook" <diverse2@tcp.co.antyspahm.uk> wrote in message
news:VbWdnVwS0pvw8Z_fRVn-hA@tcp.co.uk...
| Quote: | Cannot find any on the web.
Easy enough to determine
the ulimate tensile strength of a given length of copper wire
but is the ideal back tensiom while winding say 1/5
of that UTS or some other factor/s ?
|
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|
| Back to top |
|
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N Cook
Guest
|
| Posted:
Fri Feb 04, 2005 1:33 pm Post subject:
Re: Coil winding back tension versus SWG/AWG table ? |
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"sofie" <sofie@olypen.com> wrote in message
news:11054bs9kv9hve2@corp.supernews.com...
| Quote: | N Cook:
1/5 nts is way too high......
For most rf coils, torroids, transformers, etc..... 5% of NTS is
adequate...
especially for soft drawn enamel insulated copper.
If you are doing motor armature windings or other rotating coils that will
be subject to centrifugal forces, the 10% number works fine for most of
these applications.
What exactly are you doing?
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
"N Cook" <diverse2@tcp.co.antyspahm.uk> wrote in message
news:VbWdnVwS0pvw8Z_fRVn-hA@tcp.co.uk...
Cannot find any on the web.
Easy enough to determine
the ulimate tensile strength of a given length of copper wire
but is the ideal back tensiom while winding say 1/5
of that UTS or some other factor/s ?
|
I was using 40 SWG copper wire which tested as about 400gm / 14 oz
breaking strength. I used 25g/1 oz of back tension and the coil bulk
just about fitted on the bobbin whereas the original had more clearance
ie more packed. I assumed 2 oz back tension was nearer the mark but wanted
to find some published data.
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