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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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#1
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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 ? |
#2
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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
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"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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