Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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N Cook
 
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Default Coil winding back tension versus SWG/AWG table ?

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
 
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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
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

"N Cook" wrote in message
...
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 ?




  #3   Report Post  
N Cook
 
Posts: n/a
Default


"sofie" wrote in message
...
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" wrote in message
...
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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