Re: flat spring, silver solder, was Re: router for sheet metal

Hi Tim,

Thanks for the suggestion on the carpet tape. No pocketing, although
there is one hole to be drilled. And on the silver solder, I was up at
the P.R.I.M.E. show and Rudy K. was telling me about making the
crankshaft for a steam engine, and he said (If I recall correctly) 600
degree silver solder. I had my wife pick up "silver solder" at a local
welding supply, and it turns out to be nothing more then "silver
bearing" solder. Worked nice for a brass project for my son, but I
don't think it is up to holding a crank shaft together! I recall Ron G.
(might have been on the Sherline list) saying that this was the WRONG
"silver solder" as well. I recall using a silver colored rod to "silver
solder" some stuff when I was in high school (also needed a paste flux),
but I haven't seen that stuff since. I think the crank shaft has to
hold up to machining after being soldered.

Alan KM6VV

Tim Goldstein wrote:

>
> Not hard to machine at all if it is just a cut out and not any pocketing.
> Just take your stock and stick it to a spoil board with some carpet tape.
> Then machine away. Pocketing that thin is a bxtch because you have to get
> the piece perfectly level. I have milled parts out of .010" brass that were
> about .100" x .400".
>
> When you way high temp silver solder what heat range are you talking? If it
> is in the 1100 - 1200 ° F range than you can always use jewelers silver
> solder. Your local welding supply store is also a good bet.
>
> Tim
> [Denver, CO]
>
> ----- Original Message -----
>
> > Hi Tony, Alex,
> >
> > I have a similar need. A small flat spring for a digitizer probe I
> > built. I need a small flat spring made out of something like phosphor
> > bronze, or steel. .006" thick (??). But as it's only about .5" long,
> > it's a little hard to machine! Glueing/soldering it down to PCB
> > material might work. I will need a tiny endmill to mill it out, I can
> > generate the Gcode easily enough. I was also thinking that this flat
> > spring could also be made by EDM, although I have no equipment for this!
> >
> > Perhaps glueing/soldering to PCB material would work in you case too
> > (let me know!).
> >
> > Pix at:
> >
> http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/Digitizer%20Probe/ProbeS
> pring2.jpg
> >
> > Look under files / Digitizer Probe / ProbeSpring2.jpg
> >
> > Alan KM6VV
> > P.S. MSC doesn't carry silver solder (high temp)? Anyone have a
> > source? I've got crankshafts to fabricate!
>