Re: [CAD_CAM_EDM_DRO] Air Cylinder Press

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

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