James Waldby wrote:

... If I could have read the
exponents in the four equations ...

I'm pretty sure it's a "3". Here's the best that I could do, but it was
only a 3kB image:
http://home.comcast.net/~bobengelhardt/formula1.jpg

Bob

On Jul 23, 11:32*pm, "Bill Noble" wrote:
...
you know, don't you, that the 'real' spring winding machines extrude the
wire against an angled anvil that is tilted in X,Y (presuming the wire is
fed in Z) so that it causes the wire to bend to the desired spiral - if you
build that, then it's simple enough to adjust to get the diameter and
spacing you want, no adjustable mandrils required.

I wonder if an equivalent could be made from a scissors knurl with
grooved rollers. Tilt the near end down to grab the wire between the
lower roller and the shaft in the spindle, and adjust the upper roller
or the crossfeed screw to change the wire loop diameter.

There is an adjustable fine wire feeder in your MIG welder.

jsw

Jim Wilkins fired this volley in news:c0765834-ce9e-
:

There is an adjustable fine wire feeder in your MIG welder.

I'd have to re-build it to accommodate 13-thousanths wire. Its low end is
0.025", right now. At 0.020, the wire just hides in the wheel groove, and
slips. I tried it with my roll of 0.020" music wire. Wheel turned, wire
didn't feed.



LLoyd

"Lloyd E. Sponenburgh" lloydspinsidemindspring.com fired this volley in
.70:

I tried it with my roll of 0.020" music wire. Wheel turned, wire
didn't feed.


I wasn't doing this for spring winding. I was trying to weld with it. No
soap.

LLoyd

On Jul 25, 9:28*am, "Lloyd E. Sponenburgh"
lloydspinsidemindspring.com wrote:
"Lloyd E. Sponenburgh" lloydspinsidemindspring.com fired this volley .3.70:

*I tried it with my roll of 0.020" music wire. *Wheel turned, wire
didn't feed.

I wasn't doing this for spring winding. *I was trying to weld with it. *No
soap.

LLoyd

How about dressing a Dremel cutoff wheel to a V shape and grinding a
new groove near the edge of the roller, then spacing it out to align
with the wire tube? I don't know how long a shop-made unhardened
roller would last, probably enough to wind a spring but not enough for
much welding.

jsw

On Fri, 23 Jul 2010 20:32:59 -0700, "Bill Noble"
wrote:


you know, don't you, that the 'real' spring winding machines extrude the
wire against an angled anvil that is tilted in X,Y (presuming the wire is
fed in Z) so that it causes the wire to bend to the desired spiral - if you
build that, then it's simple enough to adjust to get the diameter and
spacing you want, no adjustable mandrils required

That's true for inexpensive springs with loose tolerances. Precision
springs are still wound on mandrels. Look in McMaster to see the
difference in tolerance and price between standard and precision
springs.

--
Ned Simmons

On Sat, 24 Jul 2010 18:51:00 -0500
"Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote:

snip
All good info. Thanks. I'm compiling a mini "library" of
spring-winding stuff.

There is a book in the Workshop Practice series, "Spring Design and
Manufacture" by Tubal Cain. It does have at least one chapter on
winding springs. I gave it a cursory glance, some of the same problems
discussed here were covered. See:

http://www.amazon.com/Spring-Design-...dp/0852429258/

There was a crappy pdf version at www.freebookspot.com a while back. It
is readable, may give you some ideas (shrug).

--
Leon Fisk
Grand Rapids MI/Zone 5b
Remove no.spam for email

Leon Fisk fired this volley in
:

http://www.amazon.com/Spring-Design-...Practice/dp/08
52429258/

Oh, MAN! That's a good one! I got it off the freebookspot site.

THANKS!

LLoyd