Bending music wire struts

Bending music wire struts

Post by Paul McIntos » Sun, 14 Feb 1999 04:00:00



The K&S bender will do it without heating.  Makes nice bends, too.

Quote:

> Can someone advise me of the proper procedure for bending music wire
> struts when it is necessary to apply heat. I have found that a cold bend
> will break 5/32" wire when bending 90 degrees. If I heat the wire till
> it's soft enough to bend, then allow to cool slowly, will the metal
> still retain enough temper, or should I reheat to a lower temp and
> again, allow to cool slowly?
> Would appreciate any comments.....

>   Robert

--
Paul McIntosh
Desert Sky Model Aviation
(877) 311-3759 (toll free)
http://www.icatmall.com/desertsky
http://www.dancris.com/~warbird/engines.html
 
 
 

Bending music wire struts

Post by Robert Le » Mon, 15 Feb 1999 04:00:00


Can someone advise me of the proper procedure for bending music wire
struts when it is necessary to apply heat. I have found that a cold bend
will break 5/32" wire when bending 90 degrees. If I heat the wire till
it's soft enough to bend, then allow to cool slowly, will the metal
still retain enough temper, or should I reheat to a lower temp and
again, allow to cool slowly?
Would appreciate any comments.....

  Robert

 
 
 

Bending music wire struts

Post by Don Hatte » Mon, 15 Feb 1999 04:00:00


Easiest way is to buy some DuBro or Goldberg Axles and put those on
instead.  File a flat on the axle after measuring, put the axle on, and then
braze or silver solder.  Neat, quick, and you don't have to worry about the
temper of the metal.

Quote:

> Can someone advise me of the proper procedure for bending music wire
> struts when it is necessary to apply heat. I have found that a cold bend
> will break 5/32" wire when bending 90 degrees. If I heat the wire till
> it's soft enough to bend, then allow to cool slowly, will the metal
> still retain enough temper, or should I reheat to a lower temp and
> again, allow to cool slowly?
> Would appreciate any comments.....

>   Robert

--
****************************
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Galena, Alaska   KE6TJG
                 USHGA 17442
http://www.freerepublic.com
****************************
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'you are innocent'--people will curse him and nations denounce him. But it
will go well with those who convict the guilty, and rich blessings will come
upon him." Proverbs 24-23-25

 
 
 

Bending music wire struts

Post by Bill Bun » Mon, 15 Feb 1999 04:00:00


If allowed to cool down naturally from red heat, the wire will be annealed.
(No temper)
If you plunge the red hot wire into oil or water, it will be glass hard and
snap at the bend.
The easiest proceedure to retemper is as follows:
Quench (meaning plunge) the red hot wire into tempering oil (SAE 10 motor
oil or auto transmission fluid will work). Then use #320 wet or dry silicone
carbide paper to polish the bend area. Then reheat the bend watching
carefully for a color change. When the metal turns a "straw" or gold color,
quench in oil. This will draw the glass hard temper down to about the
original temper.
Needless to say, it is best to practice on a s***of wire. If you reheat
past the straw color, you will see blue - be ready to quench at straw, even
if you remove the heat the color may continue into blue if you dawdle.

 
 
 

Bending music wire struts

Post by Dr1Driv » Tue, 16 Feb 1999 04:00:00


Quote:
>Can someone advise me of the proper procedure for bending music wire
>struts when it is necessary to apply heat.

Music wire is heat treated.  You never want to apply heat.  This takes the
hardness out of the wire and renders it useless as LG, it will now bend at the
slightest force.  5/32" wire should not break at a 90 degree bend, unless
you're trying for a "0" radius corner.  Use a K&S Mighty Wire Bender tool and
you'll have no problems bending 5/32" wire well over 90 degrees.  After it's
heated, it needs to be re-heat treated, a process unavailable to most R/C
workshops.
Dr.1 Driver
(the pilot formerly known as Gerald43)
"There's a Hun in the sun!"
 
 
 

Bending music wire struts

Post by Mike Norto » Thu, 18 Feb 1999 04:00:00


I have a very small home machine shop, and make tools out of water-hardened
steel.  If you have trouble getting the straw color, just put in an oven at
425 degrees F for about 30-45 minutes.  It doesn't even smell up the oven
(like baking epoxy does ;-)

This primarily stress relieves the steel; it is still hard enough to use as
a cutting tool.  Temperatures near 500 degrees will actually draw a little
of the temper.

Quote:

>If allowed to cool down naturally from red heat, the wire will be annealed.
>(No temper)
>If you plunge the red hot wire into oil or water, it will be glass hard and
>snap at the bend.
>The easiest proceedure to retemper is as follows:
>Quench (meaning plunge) the red hot wire into tempering oil (SAE 10 motor
>oil or auto transmission fluid will work). Then use #320 wet or dry
silicone
>carbide paper to polish the bend area. Then reheat the bend watching
>carefully for a color change. When the metal turns a "straw" or gold color,
>quench in oil. This will draw the glass hard temper down to about the
>original temper.
>Needless to say, it is best to practice on a s***of wire. If you reheat
>past the straw color, you will see blue - be ready to quench at straw, even
>if you remove the heat the color may continue into blue if you dawdle.

 
 
 

Bending music wire struts

Post by Olin K. McDani » Fri, 19 Feb 1999 04:00:00


Well written, excellent advice.  But for those who have never "seen
the colors run", they may not be able to follow.  Too bad though, some
of the other advice on here is flawed.

Olin McDaniel



Quote:

>If allowed to cool down naturally from red heat, the wire will be annealed.
>(No temper)
>If you plunge the red hot wire into oil or water, it will be glass hard and
>snap at the bend.
>The easiest proceedure to retemper is as follows:
>Quench (meaning plunge) the red hot wire into tempering oil (SAE 10 motor
>oil or auto transmission fluid will work). Then use #320 wet or dry silicone
>carbide paper to polish the bend area. Then reheat the bend watching
>carefully for a color change. When the metal turns a "straw" or gold color,
>quench in oil. This will draw the glass hard temper down to about the
>original temper.
>Needless to say, it is best to practice on a s***of wire. If you reheat
>past the straw color, you will see blue - be ready to quench at straw, even
>if you remove the heat the color may continue into blue if you dawdle.

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Bending music wire struts

Post by Pé Reiver » Sun, 21 Feb 1999 04:00:00


Bill, Gerald,

it gets worse, music (piano) wire is stretch drawn up to a specific
hardness, so causing the grain to run
lengthwise in the wire to give it the wonderful properties. Heating will
cause a re-orientation of the steel crystals, losing the original drawn
grain properties, which never can be regained.
If the bending has to be done alongside the wheels however, the in-flight
bending forces during landings are low enough to get away with it. If you
let the wire cool in air, the cooling process is quick enough to regain some
hardness. (in big planes I would resort to oil hardening from cherry red and
subsequent tempering on straw colour as stated elsewhere in this thread. )
Some music wire is of such bad quality, that it will break or start a chip;
then you have to do unthinkable things.

P

Quote:
>>Can someone advise me of the proper procedure for bending music wire
>>struts when it is necessary to apply heat.

>Music wire is heat treated.  You never want to apply heat.  This takes the
>hardness out of the wire and renders it useless as LG, it will now bend at
the
>slightest force.  5/32" wire should not break at a 90 degree bend, unless
>Dr.1 Driver
>(the pilot formerly known as Gerald43)
>"There's a Hun in the sun!"

 
 
 

Bending music wire struts

Post by Bill Bun » Fri, 16 Apr 1999 04:00:00


Once again, how to retemper large music wire after heating and bending:

If allowed to cool down naturally from red heat, the wire will be
annealed.
(No temper)
If you plunge the red hot wire into oil or water, it will be glass hard
and
snap at the bend.
The easiest proceedure to retemper is as follows:
Quench (meaning plunge) the red hot wire into tempering oil (SAE 10
motor
oil or auto transmission fluid will work). Then use #320 wet or dry
silicone
carbide paper to polish the bend area. Then reheat the bend watching
carefully for a color change. When the metal turns a "straw" or gold
color,
quench in oil. This will draw the glass hard temper down to about the
original temper.
Needless to say, it is best to practice on a s***of wire. If you
reheat
past the straw color, you will see blue - be ready to quench at straw,
even
if you remove the heat the color may continue into blue if you dawdle.

 
 
 

Bending music wire struts

Post by Cliff Griffi » Mon, 19 Apr 1999 04:00:00


Another way to lightly soften the wire just to remove brittleness after
hardening it, is to throw it in the oven at about 450F for a couple of
hours. This doesn't take practice.

Quote:

> Once again, how to retemper large music wire after heating and bending:

> If allowed to cool down naturally from red heat, the wire will be
> annealed.
> (No temper)
> If you plunge the red hot wire into oil or water, it will be glass hard
> and
> snap at the bend.
> The easiest proceedure to retemper is as follows:
> Quench (meaning plunge) the red hot wire into tempering oil (SAE 10
> motor
> oil or auto transmission fluid will work). Then use #320 wet or dry
> silicone
> carbide paper to polish the bend area. Then reheat the bend watching
> carefully for a color change. When the metal turns a "straw" or gold
> color,
> quench in oil. This will draw the glass hard temper down to about the
> original temper.
> Needless to say, it is best to practice on a s***of wire. If you
> reheat
> past the straw color, you will see blue - be ready to quench at straw,
> even
> if you remove the heat the color may continue into blue if you dawdle.

--
Cliff Griffin
Remove the obvious for NO SPAM.
 
 
 

Bending music wire struts

Post by Dr1Driv » Tue, 20 Apr 1999 04:00:00


Quote:
>Another way to lightly soften the wire just to remove brittleness after
>hardening it, is to throw it in the oven at about 450F for a couple of
>hours.

That also takes ALL the hardness out of it and it will bend at the slightest
force.
Dr.1 Driver
"There's a Hun in the sun!"
 
 
 

Bending music wire struts

Post by Mike Norto » Wed, 21 Apr 1999 04:00:00


I have had good luck with 375 degrees for 1 hour.  This will strain relieve
the metal and remove much of the brittleness without sacrificing any
noticeable hardness.  (450 will temper it somewhat.)

I use this to relieve water-quenched tool steel pieces after hardening; I
have also used it on music wire.

Don't trust the oven thermostat; at least, get a cheap oven thermometer.  My
oven reads about 30 degrees below the setting, and goes up and down over a
25 degree range.  I just try to get the middle of the range to the
temperature I want.

Quote:

>>Another way to lightly soften the wire just to remove brittleness after
>>hardening it, is to throw it in the oven at about 450F for a couple of
>>hours.

>That also takes ALL the hardness out of it and it will bend at the
slightest
>force.
>Dr.1 Driver
>"There's a Hun in the sun!"