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getting a hw95 piston buttoned?

Discussion in 'Anything Airgun Related' started by mark.177, Feb 1, 2014.

  1. mark.177

    mark.177 Donator

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    been looking for someone that can button a piston but so far not having much luck. just wondered if anyone here has had it done or can do it?
    also is it the sort of thing you can just send the piston off or do you need to send the chamber as well?
     
  2. SteveO

    SteveO Top Poster

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    Think you are going to need to send the comp cylinder too Mark, unless you are handy enough to rub the buttoning down evenly so it runs smoothly?
     
  3. martin22

    martin22 Donator

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    had mine done by dave hall,i think the buttons are fitted then there turned down on the lathe so its a perfect fit to the cylinder so id presume the piston and cylinder would have to be sent off,its a mod i'd definatly recommend though
     
  4. mark.177

    mark.177 Donator

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    thanks. do you still have a contact number for dave? what sort of price/turnaround?
     
  5. martin22

    martin22 Donator

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    pm sent
     
  6. Speed

    Speed Busy Member

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    im sure ive seen buttons that just glue on to save milling the holes then i assume you file to fit
     
  7. valboskie

    valboskie Busy Member

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    there is another thread some where running just now about this it seems welsh willy sells glue on buttons a few people have used them and they worked brilliantly .
    atb
    David
     
  8. andy draper

    andy draper Posting Addict

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    As David said,macarri do buttons for about £6 and I believe ww as well.You just superglue them onto the piston and cylinder as well,bloke on the bay does exchange piston/cylinder polished and buttoned not sure how much for a 95 but 97/77 are £100,95's are cheaper though.
    andy.
     
  9. mark.177

    mark.177 Donator

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    just spoken to the chap that made my delrin spring guide and top hat, he says he can mill and button the piston for £40 plus return postage.
    hes also re doing the top hat and spring guide as they are both too small in diameter to fit the spring well. so sending him the spring, piston and cylinder.
    said he should be able to get it all back to me within the week so heres hoping!
    the piston sleeve i think made a difference reducing the twang and vibration but i think once the piston is buttoned and the spring guides are the right size it should shoot like a tuned rifle? have polished the trigger and opened up the transfer port from 3.1 to 3.2 and chamfered it ever so slightly inside and out... will need to cut a link from the spring as very close to the limit at the moment with aa fields... 11.99ft/lbs!
     
  10. andy draper

    andy draper Posting Addict

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    Why did you open up the transfer port,does it make any difference,and do you think that's why it's a bit near the limit?
    andy.
     
  11. mark.177

    mark.177 Donator

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    i opened it up just a tiny bit as the piston was made slightly lighter removing the metal piston liner/metal washer and replacing it with a delrin top hat and ptfe liner. it was 11.35ft/lbs as standard before doing anything but after opening up the transfer port the tiniest amount from 3.1mm to 3.2mm it shot up to 11.99! it was i think dieseling just a little the first few 50 or so shots and reading 12.30! but settled to just below 12... i will be cutting a link out of the spring i just want to get all the work done and put a few hundred pellets through it and see where it settles before chopping the spring. im hoping to get it down somewhere between 11 and 11.5ft/lbs and shooting smooth. the rifle is in bits at the moment and will be posting the cylinder, piston and spring tomorrow.
     
    Last edited: Feb 2, 2014
  12. andy draper

    andy draper Posting Addict

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    That's quite a power increase over .5 f/lb for .1mm.Cheers for that mark,I was curious to it's effect,someone on the WOC said he was working on his 77 and someone had drilled it out to 4mm,I don't know if it works the same but that would in theory put it up by 4.5.
    cheers mate.
    andy.
     
  13. mark.177

    mark.177 Donator

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    dont think its as straight forward as that. drill to big and you loose volume and power! there is a sweet spot depending on piston weight type of pellet, volume, calibre. im pretty sure if you open it too much you'll get awful piston slap? ... it was an experiment on my part which is why i only opened it to 3.2mm. theres lots of discussion on it all over the web. lots of guys fitting adjustable transfer ports and trying different sizes, seems velocity goes up as you get bigger then plateaus, as you get bigger still it starts to fall again and the rifles start to get really harsh. im sure others will know far far more about it than me.
     
    Last edited: Feb 2, 2014
  14. Speed

    Speed Busy Member

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    if you could update this with pics/prices etc mark when you get sorted, while mine is in bits getting a WW KIT i may aswell have it buttoned too
     
  15. mark.177

    mark.177 Donator

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    as soon as i get it back will put some pics up and give my opinion of the work done... hope he does a good job! quoted £40 plus postage. im getting the delrin spring guide and top hat re made as well as was too loose a fit in the spring. keeps me busy while waiting for the stock i guess... should have it all sorted in the next two weeks hopefully. then I'll get the DSLR and speed lights out for some proper pics!
     
    Last edited: Feb 2, 2014
  16. Speed

    Speed Busy Member

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    thanks mark, i have a 3 week wait till my ww kit comes, cant wait
     
  17. mark.177

    mark.177 Donator

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    well i should get it all back by the weekend or early the following week... fingers crossed. if its any good i'll pm you his number:up:
     
  18. mark.177

    mark.177 Donator

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    just had an email with this pic from the chap who's buttoning my hw95 piston, has finished the new bigger guides as well. just waiting for it to be posted back.
    i have the 1mm thick ptfe piston liner here still so not shown fitted.
    [​IMG]
     
    Last edited: Feb 5, 2014
  19. martin22

    martin22 Donator

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    looks like a work of art that mark :up: when you opened up the port how did you go about it? as in did you just use a .1mm bigger drill bit and if so was it with a handheld or bench drill,only reason i ask is i remember having to enlargen some roll cage mounting bracket bolt holes i made back when i was building my offroader,if i remember right i had to enlargen them from 15-16mm but it kept knackering the tips of the drill bits up on the outer edges,obviously i know .1 is a lot different to 1.0 but was it easy enough?
     
  20. Speed

    Speed Busy Member

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    oooo nice that was quick

    do you have to file the buttons down to fit your tube, or did you send him everything, how much was it to post both ways
     

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