Monday, August 22, 2011

Day 2: The Cannon "Barrel" Assembly is done






A hot day, sweaty work... but I got it done. The frame is finished. I even found enough time to start on the crank handle. The "cross" is made from 12 mm solid steel, 33cm at each side, strengthened by a 16 mm steel tube in the critical first 15 cm. This is all welded together, very strong.

Transmission of the crank is 26:1, means, if I go up to 500 kg (1100 lbs) of a draw, I have to pull with 19 kg (42 lbs) force at the end of the handles, very doable. 

I decided to go with the clamp-on attachment method, will increase safety be using a round rod as an additional "wedge". This is the strongest known attachment method.

Tomorrow, the winch has to be finished, and the two drawing ropes have to be installed. With some luck, the weapon will be able to fire tomorrow evening. Wednesday is reserved for the carriage assembly.
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47 comments:

  1. DukaTheAugust 22, 2011 at 8:32 PM

    Realy big barrel :)

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  2. Tosh TogoAugust 22, 2011 at 8:39 PM

    I appreciate the hot sweaty work (I'm demolishing my old tool shed and re-cycling some of the lumber). But look at it! Wow! Just how long is the barrel? It does look very strong and capable. Every time I take a break, I come inside to the a/c and look to see what has developed and this time, I am not disappointed.

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  3. Mark August 22, 2011 at 8:40 PM

    now im really looking forward to seeing this

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  4. karlssonAugust 22, 2011 at 8:47 PM

    awesome indeed :D

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  5. The Slingshot ChannelAugust 22, 2011 at 8:54 PM

    The poles are 3 meters long (about 10 ft).

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  6. PHIL-ROKAugust 22, 2011 at 9:25 PM

    What are you going to be shooting at?

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  7. AnonymousAugust 22, 2011 at 9:34 PM

    uah scary. May the zombie hordes come

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  8. WmpyrAugust 22, 2011 at 9:50 PM

    I can't even picture what its going to look like yet, but it does look well thought out and I'm sure its going to work. Although your expectations maybe much higher than mine!

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  9. BavarianBarbarianAugust 22, 2011 at 10:07 PM

    Well done! I'm sure that the construction is strong enough. The lumber is probably much thicker than it needs to be and the steel parts give additional safety.

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  10. The Slingshot ChannelAugust 22, 2011 at 10:47 PM

    Well, a chain is only as strong as its weakest link. We shall see.

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  11. howardAugust 22, 2011 at 11:25 PM

    WoW, that thing will rock!

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  12. szymeon.1996August 23, 2011 at 12:04 AM

    uuuuuuuuuuuuuuuuuuuuuuuuu aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaawesomeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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  13. CarjaAugust 23, 2011 at 12:05 AM

    me here.

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  14. PikemanAugust 23, 2011 at 12:49 AM

    I'm very impressed with the design, the craftsmanship, and especially with the tremendous rate of progress you're making. I would have expected this slingshot cannon to be built over a few weeks or months, not a few days. Thanks for sharing the experience, your great ideas and great attitude are truly inspiring.

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  15. CamilloNAugust 23, 2011 at 5:51 AM

    Cool....that's absolutely amazing.

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  16. wood and metalAugust 23, 2011 at 6:37 AM

    I CANT WAIT TO SEE IT SHOOT COOL WORK AS ALWAYS

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  17. AnonymousAugust 23, 2011 at 7:13 AM

    *jaw drops*
    very nice work i cant wait to see it shoot
    cant wait to see what gets shot :)

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  18. RabenschildAugust 23, 2011 at 10:33 AM

    This looks massiv!!!

    I do not want to be the target.

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  19. Slingshot WraithAugust 23, 2011 at 11:41 AM

    I've been trained on the M119 and love getting to fire that howitzer, but your slingshot cannon is full of eccentric old school charm, I would love to be able to shoot that beast

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  20. Opticus SpicusAugust 23, 2011 at 12:56 PM

    Hi Jörg.
    Greeeeaaaat.Awesome. Aber bist du dir sicher, daß der Kreisausschnitt nicht zu klein ist? Da muß ne Menge Band, das Leder und die Kugel durch.
    Ich würd´ja auch gern alles in englisch schreiben, aber mein Schulenglisch ist 26 Jahre her. Das sieht so besser aus.
    Viele Grüße aus dem Hunsrück

    ReplyDelete
  21. ryanslumanAugust 23, 2011 at 1:32 PM

    labor of love eh!

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  22. Kris137123340August 23, 2011 at 3:33 PM

    I hope I get the Panther this week so i can cherish it for the rest of my life.It would mean a lot to me!Good luck with the rest of the assembly Jörg.

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  23. AnonymousAugust 23, 2011 at 3:43 PM

    Gonna be awesome! i can't wait to see that thing fire.

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  24. AnonymousAugust 23, 2011 at 4:11 PM

    Line up the zombies in a line, aim, headshot!'
    Looks awesome.

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  25. MuizertAugust 23, 2011 at 4:15 PM

    They are right: this isnt a slingshot, this is :
    RUBBERPOWER !!! :) I would like to see the faces of the other drivers on the road when you have this cannon behind youre car driving to the shooting spot :) :) Love it ! Its a 6 hour drive from my place to youre's but for this i would come over and see.

    All the best.

    ps i did have a tec question but i,m gonna wait untill after this project :)

    ReplyDelete
  26. HorstelAugust 23, 2011 at 5:57 PM

    Nice work! it looks good except the lock and the band attachment. Imo it would take a bigger peace of wood to clamp the bands on and somewhat more stable than a 2cm wooden rod with iron core. do you tested it or something? or is it just me, because of my level of (not) knowing?

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  27. Adam WAugust 23, 2011 at 6:04 PM

    I cant wait to see the destruction this beast does!!!

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  28. bj666August 23, 2011 at 6:13 PM

    i hear epic music and thunder when i look at the pictures! lol this is going to be insane!
    thanks for sharing with everyone

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  29. RandyAugust 23, 2011 at 7:23 PM

    C'est formidable!

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  30. DenAugust 23, 2011 at 7:36 PM

    He he ))) looks sweat))), need more rubber bands on the short length of the barrel i think

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  31. B. KüttelAugust 23, 2011 at 7:49 PM

    That really is a monster! I Can't wait to see the YouTube video for this!!!!

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  32. GomezAugust 23, 2011 at 7:49 PM

    Nice work of art. I'll like to see it in action.
    I hope you will make a clip of it when ists redy.

    Greetings

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  33. TayloriandAugust 23, 2011 at 7:56 PM

    Fantastic work Jorg,
    wow that thing is going to be huge!
    keep us posted ..
    Ian

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  34. The Slingshot ChannelAugust 23, 2011 at 8:04 PM

    Horstel, the dimensions are misleading. The wooden rod (birch) is 35 mm in diameter, and the "weakly" core is a massive 12mm threaded stainless steel rod.

    ReplyDelete
  35. Tosh TogoAugust 23, 2011 at 8:15 PM

    Ya know, the fourth picture is disconcerting. At least it is for me who had a nightmare of it last night. It was the last thing I saw and then I woke up in a cold sweat! I don't think I want to see that image anymore! Poor zombie car! :)

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  36. szymonidesAugust 24, 2011 at 3:19 PM

    OH AAAAAAAAAAAAAAEH!

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  37. As8MaNAugust 25, 2011 at 2:35 AM

    What a monster :D

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  38. John SAugust 25, 2011 at 2:47 AM

    How did you get the transmission of the crank to be a 26:1 Ratio?

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  39. Mike2August 25, 2011 at 3:09 AM

    How far do you think it will shoot?

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  40. cougarAugust 25, 2011 at 3:28 AM

    I just started hunting. I want to get a deer with a slingshot, using an arrow as a projectile.

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  41. slingshotAugust 26, 2011 at 2:27 AM

    that looks promising!

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  42. dmitriAugust 26, 2011 at 3:30 PM

    how many hours did this take?

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  43. AnonymousAugust 27, 2011 at 3:04 PM

    All the best for your cannon - project Mr Sprave !
    I'm very interested in your hobby 'cause it's my hobby ,too .
    You can contact me over YouTube at DJJuMaXXX or at
    steinschleudern.jimdo.com .

    Yours 12-year-old Julius M. S.

    ReplyDelete
  44. slingshotmaniacAugust 27, 2011 at 4:22 PM

    It's time for car destruction!!!!!!!!!

    ReplyDelete
  45. BurninatorAugust 27, 2011 at 9:22 PM

    Joerg--great project. Have you read "The OSS Crossbows" by John Brunner? There's lots of information on a very similar weapon--the "Joe Louis Grenade Thrower" (1200 lb pull, 24" draw length). The book is a great read, lots of pictures, experiment set-ups, descriptions of construction materials, etc. on the Joe Louis and other smaller rubber-powered weapons(Little Joe and Big Joe crossbows).

    ReplyDelete
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