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Posted by on March 18, 2008, 5:48 pm
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Anyone know the mystery art of getting some of the arch out of some
used leaf springs ?
I thought it had to do with heating and cooling, but an old timer said
that the spring guys would just beat on them appropriately in the
right spots and they would straighten out. I would assume the
appropriate spots would be on the inside of the curve in order to
stretch it, but not sure.
I have an older truck with some broken and mismatched leaves up front.
The main leaves are fine... I just need to take some newer leaves I
have laying here and flatten them out a bit if possible.
thanks
Grummy
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Posted by Steve Lusardi on March 18, 2008, 11:58 pm
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The correct way is annealing, bending to shape, hardening and redrawing, but
if you do not know the alloy, you won't know at what temperatures to do
this. If you don't have the facilities to do this, it is also impractical.
So, this leaves two choices. Go to a spring shop and buy what you need or
take your old springs and try to reform them cold, but to do this requires
you to push the leaves beyond their yeild point and that could be both
difficult and dangerous. I don't think this is possible with hammer alone. I
think you will have to force the spring to flatten and then with a very
heavy hammer slam the spring past its yeild point, but if that shock causes
the spring to release itself, it could kill or seriously injure you. Of
course, this operation is all about feel. I wouldn't do it. The cost savings
involved isn't worth the safety risk.
Steve
> Anyone know the mystery art of getting some of the arch out of some
> used leaf springs ?
>
> I thought it had to do with heating and cooling, but an old timer said
> that the spring guys would just beat on them appropriately in the
> right spots and they would straighten out. I would assume the
> appropriate spots would be on the inside of the curve in order to
> stretch it, but not sure.
>
> I have an older truck with some broken and mismatched leaves up front.
> The main leaves are fine... I just need to take some newer leaves I
> have laying here and flatten them out a bit if possible.
>
> thanks
>
> Grummy
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Posted by on March 19, 2008, 5:01 pm
Please log in for more thread options On Wed, 19 Mar 2008 04:58:47 +0100, "Steve Lusardi"
>The correct way is annealing, bending to shape, hardening and redrawing, but
>if you do not know the alloy, you won't know at what temperatures to do
>this. If you don't have the facilities to do this, it is also impractical.
>So, this leaves two choices. Go to a spring shop and buy what you need or
>take your old springs and try to reform them cold, but to do this requires
>you to push the leaves beyond their yeild point and that could be both
>difficult and dangerous. I don't think this is possible with hammer alone. I
>think you will have to force the spring to flatten and then with a very
>heavy hammer slam the spring past its yeild point, but if that shock causes
>the spring to release itself, it could kill or seriously injure you. Of
>course, this operation is all about feel. I wouldn't do it. The cost savings
>involved isn't worth the safety risk.
>Steve
>
I've arched springs many times with just a heavy hammer. I've also
bent them in a hydraulic press, cold.
But to relieve automotive leaf springs I generally just heated a
couple of the booster leaves a few inches from the end and pulled
them down a bit.
>> Anyone know the mystery art of getting some of the arch out of some
>> used leaf springs ?
>>
>> I thought it had to do with heating and cooling, but an old timer said
>> that the spring guys would just beat on them appropriately in the
>> right spots and they would straighten out. I would assume the
>> appropriate spots would be on the inside of the curve in order to
>> stretch it, but not sure.
Beating on the inside arches the spring. Beating on the outside
de-arches.from my experience
>>
>> I have an older truck with some broken and mismatched leaves up front.
>> The main leaves are fine... I just need to take some newer leaves I
>> have laying here and flatten them out a bit if possible.
>>
>> thanks
>>
>> Grummy
>
--
Posted via a free Usenet account from http://www.teranews.com
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Posted by on March 21, 2008, 12:54 pm
Please log in for more thread options Thank you guys..... This is exactly what I was wondering. I will get
my hammer and a thick pair of gloves.
grummy
On Mar 19, 4:01 pm, clare at snyder dot ontario dot canada wrote:
> On Wed, 19 Mar 2008 04:58:47 +0100, "Steve Lusardi"
>
> >The correct way is annealing, bending to shape, hardening and redrawing, but
> >if you do not know the alloy, you won't know at what temperatures to do
> >this. If you don't have the facilities to do this, it is also impractical.
> >So, this leaves two choices. Go to a spring shop and buy what you need or
> >take your old springs and try to reform them cold, but to do this requires
> >you to push the leaves beyond their yeild point and that could be both
> >difficult and dangerous. I don't think this is possible with hammer alone. I
> >think you will have to force the spring to flatten and then with a very
> >heavy hammer slam the spring past its yeild point, but if that shock causes
> >the spring to release itself, it could kill or seriously injure you. Of
> >course, this operation is all about feel. I wouldn't do it. The cost savings
> >involved isn't worth the safety risk.
> >Steve
>
> I've arched springs many times with just a heavy hammer. I've also
> bent them in a hydraulic press, cold.
> But to relieve automotive leaf springs I generally just heated a
> couple of the booster leaves a few inches from the end and pulled
> them down a bit.
>
> >> Anyone know the mystery art of getting some of the arch out of some
> >> used leaf springs ?
>
> >> I thought it had to do with heating and cooling, but an old timer said
> >> that the spring guys would just beat on them appropriately in the
> >> right spots and they would straighten out. I would assume the
> >> appropriate spots would be on the inside of the curve in order to
> >> stretch it, but not sure.
>
> Beating on the inside arches the spring. Beating on the outside
> de-arches.from my experience
>
>
>
> >> I have an older truck with some broken and mismatched leaves up front.
> >> The main leaves are fine... I just need to take some newer leaves I
> >> have laying here and flatten them out a bit if possible.
>
> >> thanks
>
> >> Grummy
>
> --
> Posted via a free Usenet account fromhttp://www.teranews.com
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Posted by JR North on March 19, 2008, 12:15 am
Please log in for more thread options I had a set de-arched at an automotive spring/chassis shop many moons
ago.
JR
Dweller in the cellar
On Tue, 18 Mar 2008 14:48:18 -0700 (PDT), grumtac@sbcglobal.net wrote:
>Anyone know the mystery art of getting some of the arch out of some
>used leaf springs ?
>
>I thought it had to do with heating and cooling, but an old timer said
>that the spring guys would just beat on them appropriately in the
>right spots and they would straighten out. I would assume the
>appropriate spots would be on the inside of the curve in order to
>stretch it, but not sure.
>
>I have an older truck with some broken and mismatched leaves up front.
>The main leaves are fine... I just need to take some newer leaves I
>have laying here and flatten them out a bit if possible.
>
>thanks
>
>Grummy
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Home Page: http://www.seanet.com/~jasonrnorth
If you're not the lead dog, the view never changes
Doubt yourself, and the real world will eat you alive
The world doesn't revolve around you, it revolves around me
No skeletons in the closet; just decomposing corpses
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> used leaf springs ?
>
> I thought it had to do with heating and cooling, but an old timer said
> that the spring guys would just beat on them appropriately in the
> right spots and they would straighten out. I would assume the
> appropriate spots would be on the inside of the curve in order to
> stretch it, but not sure.
>
> I have an older truck with some broken and mismatched leaves up front.
> The main leaves are fine... I just need to take some newer leaves I
> have laying here and flatten them out a bit if possible.
>
> thanks
>
> Grummy