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Electric -Stirrup pump ! Who needs a bottle.

Discussion in 'Anything Airgun Related' started by gedfinn, Sep 14, 2014.

  1. gedfinn

    gedfinn Posting Addict

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    I looked at the thread below, Bottle or Tank, ? I have both but the pump is too hard for me.

    There must be MANY unused stirrup pumps about , Averaging about £60 each,
    I have one almost complete , IE Its a stirrup pump on a housing with an electric motor, The speed can be set by the pulley ratio , ( Not too fast ) They pump at a good rate manually But!!!!! Ha ha,

    I think there is a market for the powered Stirrup pump housing , I have seen a couple of examples, 12volt, 240, 1/4 Hp , 1/2 Hp Etc,
    Some clever designs but simple is best, Also the cheapest to make/Manufacture . As an aside, How much would you pay for one, Mine cost around £20- £40 to make with secondhand parts, Mainly from car boots.

    However anyone selling them would have to use all New parts, ( I guess ) Again much easier/Cheaper to mass manufacture.
    I would finish it but I have a big air bottle.

    Cheers Ged.
     
    Last edited: Sep 14, 2014
  2. dave goodall

    dave goodall Donator

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    Fx have already made these and they didnt prove all too cracky with over heating seals blowing and moisture been sent to the guns interals atvb dave
     
  3. gedfinn

    gedfinn Posting Addict

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    Well thanks for the quick negative response mate !
    FX in fact did not make them ! They made a unit incooperating a smaller pump, It ran at a much higher speed as they said it could fill Diving cylinders .
    It was not a housing to hold a manual stirrup pump , Thats what I was suggesting ,

    I did say it was to run slow, It is only for charging airguns, The moisture bit is easy to resolve, ?
    I guess you will not need the construction/working Pics

    Cheers, Ged.
     
  4. mattyts

    mattyts Donator

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    Was it you who created a similar thread a few month ago?

    I just don't see the point in it,if you need to refill occasionally,get a pump,you'll use it rarely and it won't need the investment of an electronic system in,if you refill often,get a bottle and have it filled occasionally at a very little cost,if you refill massively,buy your own shoe box compressor.
     
  5. cloverleaf

    cloverleaf Honorary Member

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    IMO no problem with negative replies, as long as they're constructive..

    The FX item looks like a short-stroked manual pump body operated by a large crank wheel; and IIRC the cheeky beggers were asking the fat end of a grand for it.

    I can see a small potential market for an electric pump / electric augmentation of an existing pump.. I suspect the moisture issue could be got around by using an in-line condenser and drain (the down-side would be the additional lost volume on the output side of the pump); should certainly work better than the snake-oil bullsh*t "Dry Pac" Hills use to extort another £50-60 from their customers..

    Certainly an achievable idea that's interesting from an engineering perspective; probably has a very limited market though and I suspect the unit would have to be quite large.
     
  6. mmamonster

    mmamonster Pro Poster

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    I think it would be a good idea if you could just plug in and turn on. Pics would be good. Atb
     
  7. Honest Bob

    Honest Bob Big Poster

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    Lots of DIY designs on Utube, some good some not so good.
     
  8. busanga

    busanga Posting Addict

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    I love this kind of stuff..MacGyver eat your heart out. would love to work out an electric system to operate my fx pump for me. Let it cycle same speed as I would normally pump and flip switch to turn it on and off to release moisture if required. Though on my carbine I generally don't have to stop I can pump it all the way through from 90 to 200 without hardly getting warm. I cycle pump slowly and deliberately stopping momentarily at bottom and Top of each stroke. would like to work out eccentric pulley on electric motor operate same way
     
    Last edited: Sep 14, 2014
  9. busanga

    busanga Posting Addict

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  10. ratman60

    ratman60 Pro Poster

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    hello, what about a 12 volt pump like that used for cars/vans?? or am i talking :down::rolleyes: not up on bar/psi/ compressors:D but there must be a forum member who is:)
     
  11. busanga

    busanga Posting Addict

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    Nowhere near enough power to achieve 200bar...3000+ psi more like 20 to 100psi
     
  12. gedfinn

    gedfinn Posting Addict

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    I made mine a bit like this-
    https://www.youtube.com/watch?v=Q2laNybPzDI

    The others like the hatsan use their own short pump, & How much does this set up cost ?
    The whole point was to utilize a number of unused/Unloved stirrup pumps,
    These have a 19" stroke length so half of that is going to be the arm length , The total length is going to be pump + 19" ,

    I made mine ( Hacked up ) like the one on the tube , with brass bushes , They worked fine as did the whole set up . I took it apart to fit proper bearings, I also used a 90 Deg speed reducer,
    However on the Mk 11 , I made up 2 sets of pulleys ( To omit this expensive item ) & Decided because of the length to run it vertically .
    I might add, I have the parts but its laid in the corner !

    The whole point of the excersize was to make a 2oo Bar pump On The Cheap. With easily replaceable seals,

    This meant using an existing £40-£60 unit & a cheap 1/3 Hp 240 motor , This could be made in multiples for around £100-£150 , The pump seal ( The main one that usually goes ) Are on the bay for 2 for £5 posted ? Remember the word CHEAP. These are easy to fit .
    The FX at £900 & Shoebox at similiar prices imported are ludicrous ! Both of these use virtually the same seals as does the Stirrup pump . I advocated a slow speed , The full size pump does have a good volume,
    On a gun I made, After the first 50 Bar, Every pump gave 1 shot at 11 & a bit Fpe.

    I might just add , I am not trying to sell anything here, ! I will not be selling anything , Please do not ask , I am 66 & do not need the work or even less the money .
    I wrongly thought there may be some intrest in the mechanics ? Guess I was wrong ,

    Ged.
     
    Last edited: Sep 15, 2014
  13. busanga

    busanga Posting Addict

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    I am very interested in the mechanics. Was thinking about this already before you posted. Also wondered why shoebox requires extra compressor when an fx pump can do the job.
     
  14. vitalich

    vitalich Keyboard Hero

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  15. terry1001

    terry1001 Major Poster

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    This could well be useful for anyone who has a pump and is finding it hard work but can't afford/can't get refilled etc a bottle. If it's something where the pump can easily be removed to take out to a shoot then even better. Stirrup pumps are not meant to be operated at high speed, they need to be pumped slowly to avoid excessive heat build up.
    There are loads of suitable electric motors about so it should be a job within the capabilities of a fairly competent DIYer.
     
  16. terry1001

    terry1001 Major Poster

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    High pressure compressors are generally multi stage meaning that the sir goes through several compression cycles before it reaches the maximu required. The shoebox compressor just does the very high pressure part so needs to be fed with compressed air from a standard compressor at 7-12 bar or thereabouts.
     
  17. busanga

    busanga Posting Addict

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  18. Honest Bob

    Honest Bob Big Poster

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    You should have a little window in the top right hand corner, asking if you want to translate it.
     
  19. vitalich

    vitalich Keyboard Hero

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    That's how I go through that forum

    All main concerns are about heat sinks and seals resource
     
    Last edited: Sep 15, 2014

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