surplus pneumatics ( was Re: Sources for belts and pulleys

PSI times area of the piston will offer the force on the shaft, but
leverage will be easier and offer similar force.

the difference is that you trade lenght of stroke for pressure. I'm
not sure if it costs more to make 1 cu ft of 250 psi or 4 cu ft of 90
psi ?

Either way, air will be pretty light.

a 6" bore with 125 psi will offer the same force as 4" at 250.

figure the crank arm for torque delivered to the work.

125 PSI is the normal working pressure of many compressors.

unfortuanatly, the energy needed to punch holes is huge. it will
take about 2.5 tons to punch a 1/4 inch hole in 1/8 steel.

for a rough estimate on steel....
hole area x thickness x 80 = tons

I think you use 65 for aluminum.

for a higher pressure, all you need to do is to push a 6" bore to get
a 4" bore on the secondary to move with the higher pressure. I'm not
sure of the compressibility of air at the higher pressures. Also, if
you push a 4" dia for 2 inches on a lever with a seconday at 1 inch
stroke, you will also multply the energy.

Dave

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Chris L <datac@l...> wrote:
> Alex,
> That sounds pretty cool.... But, 250psi ?? That is a "lot of
stuff"
> behind a 4" piston. Wow. Everyshop I've been in around here, OSHA
stepps
> in and wants the pressure to not exceed 90psi unless the device is
> literally "guarded to death", and with drag racers "tranny blanket"
> wrapped around anything even suspected of a failure in the next 100
> years. (for good reason I suppose)
>
> The Surplus Center catalog has a 4" diameter 4" Stroke Cylinder
rated
> for 250psi for $59.95 listed in their catalog. (dual acting - 1"
rod)
>
> I know a few years back, I found companies doing this with
suprisingly
> small bore Air cylinders, but they had some "secondary" technique
built
> into the cylinder. I am going to dig up that old literature....
Might
> have been air over sealed hydraulic of some kind.
>
> Cool. Post pictures when that things is done. I've contemplated a
Cnc
> Punch press with air as well....
>
> Chris L
>
> alex wrote:
>
> >Folks,
> >the reason I need this cylinder, I want to build a light - duty NC
turret
> >punch.
> >It will utilize Jon Elson's Universal Stepper board and EMC.
> >Capacity: 22 gage steel, 1/8 aluminum. Stock size: 6" x 18".
> >Alex
> >
> >----- Original Message -----
> >From: turbulatordude <davemucha@j...>
> >To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> >Sent: Sunday, May 04, 2003 6:54 PM
> >Subject: [CAD_CAM_EDM_DRO] surplus pneumatics ( was Re: Sources
for belts
> >and pulleys
> >
> >
> >
> >
> >>4" bore, how long a stroke ? what pressure ? there are lots of
> >>cheal (under $100.00) plastic units with 4" stroke with a 60 psi
max
> >>pressure. but typically longer, 8-10inches used for HVAC
> >>applications.
> >>
> >>Dave
> >>
> >>
> >>
> >>
> >>
> >>--- In CAD_CAM_EDM_DRO@yahoogroups.com, "alex" <telecomt@t...>
wrote:
> >>
> >>
> >>>Thank you, Dave,
> >>>I'm looking for a high-bore (more then 4") or a pancake cylinder
> >>>
> >>>
> >>plus 2 and
> >>
> >>
> >>>3
> >>>position 2 way solenoid valves.
> >>>Regards, Alex
> >>>----- Original Message -----
> >>>From: turbulatordude <davemucha@j...>
> >>>To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> >>>Sent: Sunday, May 04, 2003 5:59 PM
> >>>Subject: [CAD_CAM_EDM_DRO] surplus pneumatics ( was Re: Sources
for
> >>>
> >>>
> >>belts
> >>
> >>
> >>>and pulleys
> >>>
> >>>
> >>>
> >>>
> >>>>e-bay offers a decent selection and it changes often enought to
> >>>>
> >>>>
> >>get a
> >>
> >>
> >>>>good variety.
> >>>>
> >>>>Herbach & Raiderman, http://www.herbach.com/about.htm
> >>>>C&H, http://www.aaaim.com/CandH/index.htm
> >>>>MECI http://www.aaaim.com/CandH/index.htm
> >>>>
> >>>>all have some stuff.
> >>>>
> >>>>if you have some specifics, let us know so we can offer some
more
> >>>>approprate sources.
> >>>>
> >>>>Dave
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>--- In CAD_CAM_EDM_DRO@yahoogroups.com, "alex" <telecomt@t...>
> >>>>
> >>>>
> >>wrote:
> >>
> >>
> >>>>>Jan,
> >>>>>what is a surplus place for pneumatic cylinders and components?
> >>>>>Alex
> >>>>>
> >>>>>
> >>>>
> >>>>Addresses:
> >>>>FAQ: http://www.ktmarketing.com/faq.html
> >>>>FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> >>>>Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
> >>>>
> >>>>Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> >>>>Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> >>>>List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com,
> >>>>
> >>>>
> >>wanliker@a...,
> >>
> >>
> >>>timg@k...
> >>>
> >>>
> >>>>Moderator: pentam@c... indigo_red@q... [Moderators]
> >>>>URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> >>>>
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> >>>>
> >>>>
> >>>aol://5863:126/rec.crafts.metalworking or go thru Google.com to
> >>>
> >>>
> >>reach it if
> >>
> >>
> >>>you have trouble.
> >>>
> >>>
> >>>>http://www.metalworking.com/news_servers.html
> >>>>
> >>>>http://groups.yahoo.com/group/jobshophomeshop I consider this
> >>>>
> >>>>
> >>to be a
> >>
> >>
> >>>sister site to the CCED group, as many of the same members are
> >>>
> >>>
> >>there, for OT
> >>
> >>
> >>>subjects, that are not allowed on the CCED list.
> >>>
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> >>>>
> >>>>
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> >>>>List Mom
> >>>>List Owner
> >>>>
> >>>>
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> >>>>Your use of Yahoo! Groups is subject to
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> >>
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> >>Addresses:
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> >>FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> >>Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
> >>
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> >>List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com,
wanliker@a...,
> >>
> >>
> >timg@k...
> >
> >
> >>Moderator: pentam@c... indigo_red@q... [Moderators]
> >>URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> >>
> >>OFF Topic POSTS: General Machining
> >>If you wish to post on unlimited OT subjects goto:
> >>
> >>
> >aol://5863:126/rec.crafts.metalworking or go thru Google.com to
reach it if
> >you have trouble.
> >
> >
> >>http://www.metalworking.com/news_servers.html
> >>
> >>http://groups.yahoo.com/group/jobshophomeshop I consider this
to be a
> >>
> >>
> >sister site to the CCED group, as many of the same members are
there, for OT
> >subjects, that are not allowed on the CCED list.
> >
> >
> >>NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY
POSTING THEM.
> >>
> >>
> >DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> >
> >
> >>bill
> >>List Mom
> >>List Owner
> >>
> >>
> >>
> >>Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >>
> >>
> >>
> >>
> >
> >
> >
> >Addresses:
> >FAQ: http://www.ktmarketing.com/faq.html
> >FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> >Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
> >
> >Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
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> >List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com,
wanliker@a..., timg@k...
> >Moderator: pentam@c... indigo_red@q... [Moderators]
> >URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> >
> >OFF Topic POSTS: General Machining
> >If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach
it if you have trouble.
> >http://www.metalworking.com/news_servers.html
> >
> >http://groups.yahoo.com/group/jobshophomeshop I consider this to
be a sister site to the CCED group, as many of the same members are
there, for OT subjects, that are not allowed on the CCED list.
> >
> >NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING
THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> >bill
> >List Mom
> >List Owner
> >
> >
> >
> >Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >
> >
> >
> >
> >