Preview: Pump Gun for M10 hexnuts, 40rd mag

Discussion in 'New project ideas' started by JoergS, Mar 29, 2013.

  1. JoergS

    JoergS Administrator

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    So many people wanted blueprints and tuts for my pump actions. <br><br>But of course the Oreo one is useless, and the cardboard one is flimsy and weak. <br><br>So I decided to make a really nice one that shoots M10 hexnuts. Those are very cheap (I buy 100 pcs for five Euros), last forever, and have the right weight. About 10 gramms is ideal for a pump gun, as draw length and weight is limited if you want to be able to fire quickly. I made one a long time ago for 20mm steel balls, but those are too heavy, three time as much as the M10 hexnuts. <br><br>Also the weapon is pretty thin, just under 30 mm wide and 80 cm long. <br><br>The magazine fits 40 rounds! <br><br>The mechanism is really the same as for the Oreo shooter - but I put in a rare earth magnet to hold the "active" nut in place. Nice, you hear a clicking noise when you repeat, and then you know everything's fine. <br><br>Will do some fine tuning and maybe even a bit of finishing tomorrow. Video on Sunday! I am hoping on our friend Linuxmail do help me with the blueprints... <br><br><img src="http://i75.servimg.com/u/f75/16/32/46/92/m10-110.jpg" border="0" alt=""><br><br><img src="http://i75.servimg.com/u/f75/16/32/46/92/m10-210.jpg" border="0" alt=""><br><br><img src="http://i75.servimg.com/u/f75/16/32/46/92/m10-310.jpg" border="0" alt="">
     
  2. tokSick

    tokSick Senior Member

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    My gosh!! 40 rounds?!!! I like the fact that it shoots hexnuts because they are way cheaper than steel balls. I already said that i love the Pump Gun mechanism but i don' t feel confident enough to buil one without BP' s. Brian, please, be our savior!!! Very well done Joerg.
     

  3. FIAAO

    FIAAO Failureisalwaysanoption

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    Awesome! I tried to repicate the old pump action shooter, but I failed... Maybe this time it will work better! Good that it shoots hexnuts!
     
  4. bushcraft kid

    bushcraft kid New Member

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    That looks awesome, some how I knew you were far from done with the pump gun action... And the hex nuts are great because many people (my self included) already shoot a lot of hex nuts.
     
  5. linuxmail

    linuxmail New Member

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    Joerg I am always ready and willing! It will be a pleasure to work with you again.<br><br>Regards,<br>Brian<br>
     
  6. JoergS

    JoergS Administrator

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    Brian.<br><br>I actually have JUST sent an email to you, with high res scans of my amateurish sketches. <br><br>Here are smaller versions as a preview:<br><br><img src="http://i75.servimg.com/u/f75/16/32/46/92/m10_he10.jpg" border="0" alt=""><br><br><img src="http://i75.servimg.com/u/f75/16/32/46/92/m10_he11.jpg" border="0" alt=""><br><br>I have shot all day long with the thing, and I am really, really happy with it. It is much better than all of the pumps I made so far, and I am finally ready to publish a tut. <br><br>With double TBG bands (each 2,5cm wide) per side, pumping is easy and lots of fun. Of course it is not the strongest crossbow, but for plinking with fast action it is perfect. <br><br>I then tripled the bands, so each side has more than a full width TBG band (20 cm per side). You can only cock this when your press the butt against your chest and pull with both arms. But then we are talking coconut smashing ballistic gelly mashing power!<br><br>Video tomorrow.
     
  7. EyAlter

    EyAlter New Member

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    Hey Jörg, if you send me the slingshot, I´ll make proper engineering drawings with full dimenions as a PDF. You can print them and stick them on the wood to cut out the pieces.
     
  8. JoergS

    JoergS Administrator

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    Made some changes as well. I added a small handle under the slide, works much better.<br><br><img src="http://i75.servimg.com/u/f75/16/32/46/92/m10sho10.jpg" border="0" alt=""><br><br>Also I added two rare earth neodyme magnets so the slide sticks to the front position when the weapon is loaded. This way you can shoot it like a pistol.<br><br><img src="http://i75.servimg.com/u/f75/16/32/46/92/m10sho11.jpg" border="0" alt=""><br><br>I also had to use more rubber to hold back the nuts, 40 of them weigh almost a pound. Still nice, you can squeeze in the nuts without moving the bands, but they never fall out. <br><br><img src="http://i75.servimg.com/u/f75/16/32/46/92/m10sho12.jpg" border="0" alt=""><br><br>Last not least I added sights, mostly for the looks. <br><br><img src="http://i75.servimg.com/u/f75/16/32/46/92/m10sho13.jpg" border="0" alt="">
     
  9. FIAAO

    FIAAO Failureisalwaysanoption

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    "Tripled the bands"... I love that sentence! <img src="http://illiweb.com/fa/i/smiles/icon_lol.gif" alt="Laughing" longdesc="7">
     
  10. Slagskimmer Mike

    Slagskimmer Mike thinks TBG smells better than roses

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    This set of plans is maybe the most exciting to me yet.<br>Looks like a real honey of a design, I'll make sure to buy enough supplies to build two.<br><br>Fractional nuts are much cheaper here, is 10m about a like the ones that fit a 7/16?<br><br>Cans and coconuts beware!<br>
     
  11. JoergS

    JoergS Administrator

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    7/16th are almost the exact same size. They should work just fine.
     
  12. linuxmail

    linuxmail New Member

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    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>Slagskimmer Mike wrote:</b></span></td></tr>
    <tr><td class="quote"> ..................Fractional nuts are much cheaper here.....<br>
    </td></tr>
    </table>
    <span class="postbody"><br>Mike, I always make two sets of drawings, one set in Inches and one set in mm.<br><br>I am working on the rough drawing right now, my drafting room is the only peaceful place in the house right now. (Easter Weekend)<br><br>Regards,<br>Brian<br></span>
     
  13. JoergS

    JoergS Administrator

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    Brian, that's great news! Can't wait to see your beautiful pieces of blueprint art.<br><br>BTW, <strong>one BIG tip:</strong> Round the edges of your trigger/sears well. An polish. <br><br>The pump gun allows you to shoot very quickly, and this is so much fun that you will shoot a lot of rounds in a very short time. <br><br>I use straight bands for this, and since the bands never hit the wood they last a long time. But the paracord string is what will break sooner or later. <br><br>In order to get the maximum lifetime, you need to round the sear as much as you can. Then polish it until it shines. If you run your finger over the sear, it needs to be completey round and smooth. <br><br>Then oil/wax the string. This way you can get hundreds of shots out of a string. Without rounding, it may not even last a dozen shots.
     
  14. mojo

    mojo New Member

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    Thats a very (and i mean veryyy!) interesting idea, whoa, i am impressed !!!<br>I like your earlier pump gun ideas too but this one have definitve a new grade, very clever! <br>Long time i am thinking about a system for round (/cylindrical) ammo (no arrows), only cock and shoot but no ideas ... and this is the solution! Thanks for sharing and what do you think ... 36 g are too heavy for ammo ?! <img src="http://illiweb.com/fa/i/smiles/icon_scratch.png" alt="scratch" longdesc="33"><img src="http://illiweb.com/fa/i/smiles/icon_silent.png" alt="silent" longdesc="25"><img src="http://illiweb.com/fa/i/smiles/icon_rolleyes.gif" alt="Rolling Eyes" longdesc="14"><img src="http://illiweb.com/fa/i/smiles/icon_wink.gif" alt="Wink" longdesc="15">
     
  15. bushcraft kid

    bushcraft kid New Member

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    I wonder if cut rods could make even cheaper ammo, or even better make a mold and cast solid lead hexagons, that would be incredible destructive ammo... <img src="http://illiweb.com/fa/i/smiles/icon_biggrin.png" alt="Very Happy" longdesc="1">
     
  16. JoergS

    JoergS Administrator

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    <embed pluginspage="http://www.macromedia.com/go/getflashplayer" src="http://www.youtube.com/v/jMuI634RAYI" width="425" height="350" type="application/x-shockwave-flash" wmode="transparent" quality="high" scale="exactfit"></embed>
     
  17. EyAlter

    EyAlter New Member

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    Hey Jörg, if you send me the slingshot, I´ll make proper engineering drawings with full dimenions as a PDF. You can print them and stick them on the wood to cut out the pieces.
     
  18. Slagskimmer Mike

    Slagskimmer Mike thinks TBG smells better than roses

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    Thanks for the replies--I'm just stoked about this project.<br><br>Having plans in inches will be a great expedient too--many thanks printmeister!<br><br>My wandering mind asks how much mass you gain by filling a nut with peened all thread or with lead. <br>I like Bushcraft kid's idea about cast lead ammo for this ; it would add some nice stopping power as well as be cheaper.<br><br>Can't wait to start making sawdust <img src="http://illiweb.com/fa/i/smiles/icon_biggrin.png" alt="Very Happy" longdesc="1"><br>
     
  19. linuxmail

    linuxmail New Member

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    PDF's were delayed due to a house full of relatives that were left-over from Easter Sunday. I am sorry for the delay, and will try to get them to Joerg tonight or tomorrow. <br><br>Regards,<br>Brian<br>
     
  20. tokSick

    tokSick Senior Member

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    Thanks for the vid. Looks like a great pump gun. I will adapt my pulley bullup for arrows and make a hexnuts shooter. <br><br>@Brian: Take your time, we are not in a hurry mate. <img src="http://illiweb.com/fa/i/smiles/icon_wink.gif" alt="Wink" longdesc="15"> Once again, thanks for your work.