I have a Z bend for those piano wire wires we used in RC flying.
It was used cold and pressed a z with square corners. So rounds
especially using a mandrel would be nicely done.
Martin
On 6/19/2015 6:31 AM, John B. wrote:
On Fri, 19 Jun 2015 18:15:00 +0800, Techman
wrote:
I need to replace a broken light duty torsion spring and need some advice.
It's broken right at the bend, I may be able to buy a new one but it
will have to come from the UK to Australia and I need it ASAP.
https://dl.dropboxusercontent.com/u/...ring%20(1).JPG
https://dl.dropboxusercontent.com/u/...ring%20(2).JPG
The spring returns an aluminum flap through and rotates through an angle
of around 90°.
The wire diameter is 4.5mm and the overall length of the spring is
around 24".
I can get some 3/16" diameter "piano wire" (4.76mm) or 5/32" (4mm) from
my local hobby shop. Will piano wire work OK as a spring in this sort of
application?
Will I have trouble cold bending the ends?
I was thinking of drilling a 5mm hole through a heavy piece of metal and
using pipe, then a hammer, applying the bend. I would try to leave a
more generous radius than the on the original.
Thoughts?
Thanks guys.
I've made a number of springs from music wire and they seem to work
pretty well. and yes, a bit more generous radius on the bends will
probably last longer.
I would think that you could bend 3/16" by hand, or perhaps a couple
of pairs of pliers, so a fancy jig shouldn't be necessary, and I
wouldn't hammer on the bends as it might work harden then even more
and could cause them to fail.
--
cheers,
John B.