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Air Gun Home Forum Index » Airgun Smithing » Simple PCP hand pump..rehase a old subject    View previous topic :: View next topic  Simple PCP hand pump..rehase a old subject   Posted: Sat Jun 13, 2009 4:46 am kanyon Silver Status Member Joined: 09 Aug 2008 Posts: 1582 Location: New Zealand Can't take total credit for this idea.... A guy on another forum got me thinking... Idea - Have a pressure chamber hooked up to the gun then pump hyd oil in to it from a hand porter power pump to desplace the air and increase the pressure... Chamber would need to sit up right so the oil enters the bottom & air exits from the top ...have a traveling piston style separater or blader to stop any oil vapor entering the gun... If the oil entering is slow enough there should be very little oil /air mixing... You could also use a air-over-hyd pnumatic porter power pump then you could pre pump the chamber to 120 psi to give a start pressure / volume off 6 att from the compresser... Good / bad or am I being silly ??? Pete Last edited by kanyon on Sat Jun 13, 2009 4:54 am; edited 1 time in total   Posted: Sat Jun 13, 2009 5:19 am Alstone Moderator & Site Supporter Joined: 01 Mar 2007 Posts: 4139 Location: Linconshire, ENGLAND Hi Kanyon what do you want deleting both? Al _________________   Posted: Sat Jun 13, 2009 5:21 am kanyon Silver Status Member Joined: 09 Aug 2008 Posts: 1582 Location: New Zealand Alstone wrote: Hi Kanyon what do you want deleting both? Al 2nd one "quote"   Posted: Sat Jun 13, 2009 5:23 am Alstone Moderator & Site Supporter Joined: 01 Mar 2007 Posts: 4139 Location: Linconshire, ENGLAND There you go. Al _________________ Re: Simple PCP hand pump..rehase a old subject   Posted: Sat Jun 13, 2009 5:31 am Alstone Moderator & Site Supporter Joined: 01 Mar 2007 Posts: 4139 Location: Linconshire, ENGLAND kanyon wrote: Can't take total credit for this idea.... A guy on another forum got me thinking... Idea - Have a pressure chamber hooked up to the gun then pump hyd oil in to it from a hand porter power pump to desplace the air and increase the pressure... Chamber would need to sit up right so the oil enters the bottom & air exits from the top ...have a traveling piston style separater or blader to stop any oil vapor entering the gun... If the oil entering is slow enough there should be very little oil /air mixing... You could also use a air-over-hyd pnumatic porter power pump then you could pre pump the chamber to 120 psi to give a start pressure / volume off 6 att from the compresser... Good / bad or am I being silly ??? Pete What’s the max pressure you can get to using a hydraulic pump? Al _________________   Posted: Sat Jun 13, 2009 5:36 am kanyon Silver Status Member Joined: 09 Aug 2008 Posts: 1582 Location: New Zealand A small hand unit will easly pump 5000 psi   Posted: Sat Jun 13, 2009 5:53 am Alstone Moderator & Site Supporter Joined: 01 Mar 2007 Posts: 4139 Location: Linconshire, ENGLAND As to my reckoning you need roughly 115.2 cubic inches of air compressed into one cubic inch to give a pressure of 3000 psi, so with a 5000 psi pump it should be possible, but I not sure how many pumps it would require. It’s a bit early in the day to work that one out. Al _________________   Posted: Sat Jun 13, 2009 6:01 am Alstone Moderator & Site Supporter Joined: 01 Mar 2007 Posts: 4139 Location: Linconshire, ENGLAND Added to the above is the thought that for a 16 cubic inch reciver it would be 16 x the number of pumps? You certainly like your hydraulic engineering Pete, I've tried the same with steam but all I get is silly figure's. Al _________________   Posted: Sat Jun 13, 2009 7:23 pm kanyon Silver Status Member Joined: 09 Aug 2008 Posts: 1582 Location: New Zealand Alstone wrote: Added to the above is the thought that for a 16 cubic inch reciver it would be 16 x the number of pumps? You certainly like your hydraulic engineering Pete, I've tried the same with steam but all I get is silly figure's. Al LOL...I spend a lot of time designing / building food & wine processing gear that has to be able to be washed down....So hyd drives from remote pumps are the safest way compaired to electric motors Pete   Posted: Sat Jun 13, 2009 9:08 pm yourdaddyjoe Supporting Member Joined: 26 May 2008 Posts: 4027 Location: Tatorville, USA NT.... just want to follow... _________________ Say "NO" to BB Gun Wars... Quid Pro Quo Rule: An eye for an eye... www.HPASports.com www.Facebook.com/hpasports been thinking along the same lines,with power   Posted: Thu Jun 18, 2009 7:47 am badshot New Member Joined: 26 Jan 2009 Posts: 9 I've got a 20 ton hydraulic wood splitter that sits around for about 50 weeks a year. Was thinking of making up a pnumatic cylinder that the hydraulic cylinder would activate. IIt's not much past the thinking stage so any comments would be appreciated   Posted: Thu Jun 18, 2009 12:37 pm Alstone Moderator & Site Supporter Joined: 01 Mar 2007 Posts: 4139 Location: Linconshire, ENGLAND Hi badshot, welcome to AirGunHome A 20 ton press as plenty of power as you only need 1.5 tons per square inch to compress one cubic inch of air to 3000 lb sq/in (200) bar, the problem is that to obtain one cubic inch of air compressed to 3000 lb sq/in you would have to do this 115 times, and if the air receiver on the air rifle had a capacity of 16 cubic inches ( which is about standard ), it would take 1840 press cycles. So to be practical using a 20 ton press you would need a compression cylinder of 4” dia x 15" in length capable of withstanding 3000psi pressure, if this was mounted beneath the press and you had a stroke length of 15” it would take 16 full press strokes to fill a 16 cubic inch air receiver to 3000 psi. Hardly worth the effort unless you already have a cylinder, the press as a stroke length of 15” and it’s power driven, what ever you do take care 3000psi of air is lethal. Al _________________   Posted: Sat Jun 20, 2009 2:37 am kanyon Silver Status Member Joined: 09 Aug 2008 Posts: 1582 Location: New Zealand Hi....my figgers say that I need a compression chamber of 15lts.. to fill a 500cc gun to 3000psi... a old Hyd ram of 20lts internal volume..The piston head could act as a oil/air separator to stop any oil vapor entering the gun hopefuly.... If I didn't have free argon to fill my guns with I would look a bit harder at system..... Pete Simple PCP hand pump..rehase a old subject     Air Gun Home Forum Index » Airgun Smithing You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum All times are GMT - 5 Hours   Page 1 of 1   All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First  Select a forum Main Forums----------------AirGunHome Q&AGeneral Air Gun Questions and TopicsPicture GalleryTarget Shooting: Casual, Fun and CompetitionHunting, Pest Control, Varminting People/Events/Airgun Issue Discussion----------------Introduce YourselfThe BS TopicClubs/Events/Regional/Political Airgun Issues Maintenance, Modification and Reviews----------------RiflesPistolsAntique, Collector and Novelty AirgunsBB GunsPellets/AmmoOpticsAccessoriesAirgun Smithing Buy, Sell or Trade Forums----------------For SaleWant to Buy   Note: If you are seeing "Please enter your username and password to log in." 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