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Old Jun 28, 2010, 12:28 PM
Out of helis, sanity returning
Tallahassee, FL
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Straightening music wire pushrods?

Anyone know a good way to straighten .020 music wire that's been coiled?

The wire that came with my TopSky kit is pretty curved, and I can't help but think that it'd work much better if straight- less friction on the teflon tubing.

Ideas appreciated.

Rick
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Old Jun 28, 2010, 01:08 PM
Walter Roos
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Canton, Ga.
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I once looked into methods to straighten spring steel wire, same as music wire I think, but not for so small a size. It involves using a metal lathe for doing it at home. As best as I can remember the straight spring steel wire you buy was produced on a reel and it has been straightened, which probably accounts for the surface marks you can see on the larger sizes. If someone has an easy way for you that's great, but it's not necessary IMO. You can do a Google search on spring steel wire for the real poop.
I suggest you just use it as is, and forget you were worried about it, or go to your local Hobby shop and buy some straight, if 36" is long enough.

walt
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Old Jun 28, 2010, 01:34 PM
Out of helis, sanity returning
Tallahassee, FL
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Quote:
Originally Posted by ROOSWH View Post
I suggest you just use it as is, and forget you were worried about it, or go to your local Hobby shop and buy some straight, if 36" is long enough.

walt
I researched it on the Net, and found nothing that worked either. Being a (recovering) perfectionist, I thought I'd check with the DLG gurus here before I gave up and just used it as is.

Guitar strings of the right diameter can be had, and when you take them out of the package, they are straight, but not long enough.

Rick
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Old Jun 28, 2010, 01:49 PM
Steve
USA, PA, Marysville
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to straighten regular wire I chuck it in a drill and clamp the other end. a few turns and its straight but music wire might break
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Old Jun 28, 2010, 01:54 PM
Walter Roos
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Canton, Ga.
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Some of the music wire distributors will sell you the wire in a coil or will straighten it for you, but that's a lot of wire. I seem to remember now something about spinning the wire while putting pressure on it would straighten it out, but to try to do that to a .020" wire would not be fun.

As the young guy at the drive thru window told me, when I asked for a little Dr. Pepper in my Coke " Whatever floats your boat".

walt
PS
Long neck Banjo strings may work. I'm sure there must be some musical instrument that uses long strings.
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Old Jun 28, 2010, 03:58 PM
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I haven`t tried this for planes, but im also a guitarist. My strings comes coiled, but when ever i replace the them, they are straight.
So i guess if you strecth it really good, let it stay that way over night, they will probably be straight, or straighter... If you tighten it too much, and cause a break, you can simply buy another one at a music store. They are long enough, and cost nothing. I guess a thin g-string for electric guitar is a good replacement.
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Old Jun 28, 2010, 04:08 PM
G_T
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If you get the stretch tension to the start of the yield point, then when the wire elongates it will straighten and work harden. Assuming it doesn't break.

Gerald
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Old Jun 28, 2010, 07:32 PM
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Don't you weaken it every time you bend it or un-bend it.
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Old Jun 28, 2010, 08:32 PM
G_T
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Not exactly. It makes it harder and can make it stronger. That is work hardening. But beyond a certain point it makes it brittle and weaker.

Gerald
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Old Jun 29, 2010, 09:17 AM
Kyle Clayton
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United States, VA, Dinwiddie
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Easily, two strong guys pulling at each end :-D sorry lol, I had to throw it out there, my dad and I do electrical work every now and then and I'll never forget when I asked him how to straighten out a severely coiled up roll of romex. Without even missing a beat or even a crack of a smile that was his exact words :-)
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Old Jun 29, 2010, 11:18 AM
Scott Zastoupil
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What great timing as I was just working on installing 0.018" pushrods last night. I tried hand straightening it and ended up with a lot of waviness. Also tried running it along a table edge, but part of it ended up straight and the other part very curly. Finally I just installed the wire in the teflon tubing and layed it along the boom and found it was already very straight. The diameter of a relaxed coil loop is 8-10". So in my opinion, do nothing. Tack one end of your teflon tubing, pull it so it's under tension and tack the other end. It should be straight as an arrow, or straight enough.
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Old Jun 29, 2010, 02:35 PM
Walter Roos
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Canton, Ga.
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Quote:
Originally Posted by szastoupil View Post
What great timing as I was just working on installing 0.018" pushrods last night. I tried hand straightening it and ended up with a lot of waviness. Also tried running it along a table edge, but part of it ended up straight and the other part very curly. Finally I just installed the wire in the teflon tubing and layed it along the boom and found it was already very straight. The diameter of a relaxed coil loop is 8-10". So in my opinion, do nothing. Tack one end of your teflon tubing, pull it so it's under tension and tack the other end. It should be straight as an arrow, or straight enough.
Scott,
In my experience, especially if using carbon rods in the tubing, if you do not have a really straight run, then it's best to put a straight piece of music wire, of the largest size that will fit inside the tubing to smooth out transitions/bends when glueing to get the minimum friction. I do the same for the stainless steel control wire, but it does have a lot less friction.

walt
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Old Jul 12, 2010, 11:34 PM
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Congress, AZ
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I use stainless steel fishing leader in .020, it's coiled in the pack, but straight after it's taken off the coil. I'd think maybe the problem is the wire. I get mine at Walmart or a large boat store.

Gary
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Old Jul 13, 2010, 07:19 PM
Out of helis, sanity returning
Tallahassee, FL
Joined Feb 2009
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Well, as it turned out, I used the curved wire as someone suggested, and all was well.

I may look into the wire leader in the future. Also, I have quite a bit of .018 music wire that came coiled loosely enough that it is straight when uncoiled (I built musical instruments at one time and have a lot of this stuff left over). Anyone know if .018 would be OK in place of .020?

Rick
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Old Jul 13, 2010, 08:18 PM
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we've been using .039 music wire.
bought it at the local hardware/everything store in town.
its TOO straight to coil. comes in a long tube.
no slop.

-roy
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