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Franklin Sankar 05-08-2019 10:47 AM

Unwinding part of coil
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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.

Shawn Everette 05-08-2019 11:36 AM

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.

Franklin Sankar 05-08-2019 02:07 PM

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.

Shawn Everette 05-08-2019 02:50 PM

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.

Franklin Sankar 05-08-2019 06:52 PM

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.

Peter Bowles 05-09-2019 05:45 PM

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.

Shawn Everette 05-10-2019 10:27 AM

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.

Franklin Sankar 05-10-2019 03:37 PM

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

Pete VanderLaan 05-10-2019 05:24 PM

clean it with acetone and use gloves.

Franklin Sankar 05-10-2019 06:28 PM

Thanks will do. When installing the coil it would get dust from the brick , how bad is that?

Pete VanderLaan 05-11-2019 09:50 AM

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.

Franklin Sankar 05-13-2019 09:54 AM

Thanks Pete. Itís always good to know there is some hope when I mess up.

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