Re: [CAD_CAM_EDM_DRO] Air Cylinder Press

Maybe I missed something in the beginning of the thread but why
not use a hydraulic "bottle" jack for a car.

I built a frame years ago and it works great.
Full control and without the safety problems.
Bertho Boman
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dave engvall wrote:

> JanRwl@... wrote:
>
> > In a message dated 29-07-00 21:21:08 Central Daylight Time,
> > jtregister@... writes:
> >
> > << You really do not want to use air to power a press. Imagine pressing a
> > bearing off a shaft. Once the parts separate, there is nothing to restrain
> > the air cylinder from flying to its fully extended position - except maybe
> > fingers and toes. >>
> >
> > Jim has this right! BOOM! But "plans"? All you gotta do is buy a big ol'
> > 3.5" bore air-piston ("cylinder") from Graingers, weld-up some bar-stock to
> > make a little "C-frame", and drill some holes and tighten a few bolts (the
> > big pistons Graingers sells even have four tapped "bolt holes" on the back
> > side!) And rig a valve. Not exactly shuttle-science! I have built several
> > such for clamping small wooden parts for glueing (in an application-specific
> > musical-instrument mfg. proceedure) and for pressing pins in pre-drilled
> > keyboard-frames for organs.
> >
> > Only... As Jim said, this is dangerous and usually "surprising", and
> > generally hazardous to the basic health of the digits and usually-unprotected
> > corneas!
> >
> > I wouldn't suggest you begin using such a device, even if very, very well
> > made, without SEEING on in use, and what for, for a few months, first.
>
> Somhow this makes more sense for pressing things ON....where there is travel constraints than in taking them off. Compressed gases
> just store TOO much energy.
>
> Dave