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Old 05-08-2019, 10:47 AM
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Franklin Sankar Franklin Sankar is offline
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Unwinding part of coil

I used a long nose pliers and wrapped the tip with tape and used it to help unwind a heater coil so I can pass the straight part between rows and continue the coil in the next row. The coil is very stiff and my fingers are not that strong.
Anyone has some tricks they use to make the unwinding easier. 3/8 inches diameter coil.
Franklin.
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Old 05-08-2019, 11:36 AM
Shawn Everette Shawn Everette is offline
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Is that an unfired coil? If so it should have be effectively "annealed" and fairly soft. A light hold in a vice might help if grip strength is an issue.
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Old 05-08-2019, 02:07 PM
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Franklin Sankar Franklin Sankar is offline
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Yes itís unfired but not as easy to do what I am doing. I am using 1 long coil instead of 1 coil in each row. So I have to unwind the coil to get from one row to the next.

Next time it will be different. 1 coil per row.
I nicked the surface of the wire and even though itís a small nick it is a good place for failure.
Thanks
Franklin
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Old 05-08-2019, 02:50 PM
Shawn Everette Shawn Everette is offline
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Alternatively if you had vertical area routed from row to row you wouldn't need to undo the coil. The nick will be a likely failure point, changes in diameter is going to make changes in resistance.
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Old 05-08-2019, 06:52 PM
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Franklin Sankar Franklin Sankar is offline
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Thanks. If I could join the wires it would extend the life. Maybe I could use a welding torch and see if it can melt the wire to mend the nick. But then that may change the chemistry of the wire and create a weak spot.
Time to get read now for the next failure.
Franklin
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Old 05-09-2019, 05:45 PM
Peter Bowles Peter Bowles is offline
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Hi Franklin,
Try heating the area to be straightened with a map gas torch or similar - heat to a moderate orange heat and then as the wire is still hot gently pull and untwist the coil from both sides. The emphasis is on the untwist rather than the pulling.
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Old 05-10-2019, 10:27 AM
Shawn Everette Shawn Everette is offline
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Realize that after you heat it will become brittle, same as after firing. If you need to alter that section further you will need to heat it again.
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Old 05-10-2019, 03:37 PM
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Franklin Sankar Franklin Sankar is offline
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Itís bad. I grind off the ridges in the pliers and cold worked the twist. If this coil last for more than ag month I am lucky. Wild estimate
Franklin
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Old 05-10-2019, 05:24 PM
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Pete VanderLaan Pete VanderLaan is offline
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clean it with acetone and use gloves.
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Old 05-10-2019, 06:28 PM
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Question

Thanks will do. When installing the coil it would get dust from the brick , how bad is that?
Franklin
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Old 05-11-2019, 09:50 AM
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Pete VanderLaan Pete VanderLaan is offline
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It's not the end of the world. The acid from your fingers is the thing to pay attention to. Where you handle it, clean it.
Is there any chance that the nick can be incorporated into a tight twist? I have crap like that hanging out from my elements all the time but I'm not trying to go much over annealing settings.
If you expect the nick to fail, then do something about it now. I would be inclined to cut the wire right at the nick, heat both of the ends from the cut, stretch them a little and then tightly coil that up in a dualwire twist. Keep it glowing hot while you do it. I think that would last longer than the nick will.
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Old 05-13-2019, 09:54 AM
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Franklin Sankar Franklin Sankar is offline
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Thanks Pete. Itís always good to know there is some hope when I mess up.
Franklin
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