re:Re: cast iron (stress relieving)

When I was younger, and worked in a machine shop, we spoke
of 'curing' cast iron with a 20 pound sledge. You know when your
done, when...
daylight is no more...
you can't pick up that damn sledge one more time...
and you've already flattened all 24 cans of Bud from the case by
dropping the damn sledge on 'em and ya gotta go the the liquor store
for another case.

Seems that a ong time ago, Bridgeport couldn't deliver enough mills
to fill demand. I'd bet they had tons of castings cureing for months
before fabrication.

--- In CAD_CAM_EDM_DRO@y..., ballendo@y... wrote:
> Dave,
>
> This is good news!
>
> The vibrator you spoke of-- How did it compare with a vibratory
> tumbler (in magnitude of shake)?
>
> I used to use one for "settling" poured concrete tiles. Is this the
> type of thing you're talking about?
>
> Thank you in advance.
>
> Ballendo
>
> P.S. What about putting them(castings) in the back of an old pickup
> and driving over rough roads? What I'm really asking here is: How
do
> you know when you're "done"?
>
> > Thermal cycling, mechanical vibration, etc all will work, if you
> > move enough distance to slip the stresses out<snip>
>
> > The shop I used to work at had a rig with a vibrator that shook
it
> > and relieved most of the stresses in one night.
> > The cheapest way I know to relieve stresses is to put the casting
> > on a resilient support (inner tubes or springs) and pound it all
> > over with a hammer.
> > Dave.