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Crossbows - Everything about Building, Modding, and Using your Crossbow Gear

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    Official Mechanical powered Crossbow build

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    • Post n°1

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    Post by whiteraven Sun Jun 17, 2012 3:32 pm

    First topic message reminder :

    Ok, so I have gathered a few things and a few ideas. Last night I got some stuff cut out on a laser cutter I have access to (love hackerspaces).

    So first official build part has begun...
    Had this cut out of corrugated cardboard.
    Official Mechanical powered Crossbow build - Page 2 Trigge12
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    • Post n°16

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    Post by Basilisk120 Wed Jun 27, 2012 6:17 pm

    Yeah not a problem
    Official Mechanical powered Crossbow build - Page 2 WhiteRaven_lock


    I should add that in point 1 when I said sear and sear angle I was looking at where the sear contacts the roller nut not the entire part.

    Maybe this will make point 1 a bit more clear. Looking at the red circle, the sear should start to drop straight down when the trigger is pulled. Then that may mean that the sear would have to push the Roller Nut back before the mechanism would fire. Trigger pull would then increase by (Draw weight X 1/8") or quite a bit. Possibly making the mechanism impossible to use. Or at least that is the concern and something to look at.

    Shortening the sear contact will also help with the above problem and giver a quicker trigger pull.
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    • Post n°17

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    Post by whiteraven Wed Jun 27, 2012 11:29 pm

    More like this?

    Official Mechanical powered Crossbow build - Page 2 Roller10

    Will have to redraw a bit more tomorrow, pending some materials I got today. Wink
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    Post by stoneagebowyer Thu Jun 28, 2012 12:02 pm

    I get all the wooden parts now, Whiteraven. This project is really facinating.
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    • Post n°19

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    Post by whiteraven Sat Jun 30, 2012 5:51 pm

    Started on the prototype bow arms. Again, these are not the final pieces, but the shapes for the final pieces.

    Official Mechanical powered Crossbow build - Page 2 100_1435 Official Mechanical powered Crossbow build - Page 2 100_1437 Official Mechanical powered Crossbow build - Page 2 100_1438 Official Mechanical powered Crossbow build - Page 2 100_1436

    I'll finish the two matching (mirror opposites though) arms, make a mold, then make replicas in wax. I'll then make the wax replicas hollow (to save weight) but the walls thick enough to with stand the required forces.
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    Post by stoneagebowyer Sun Jul 01, 2012 3:35 am

    Very nice, and very creepy. How did you do the finish job on this? It looks like real bone.
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    Post by whiteraven Sun Jul 01, 2012 5:02 pm

    stoneagebowyer wrote:Very nice, and very creepy. How did you do the finish job on this? It looks like real bone.

    Thanks! That's the idea behind using a real bone for it. Wink It IS real bone.

    Again, this is the mold pattern I will replicate in wax, then eventually a silicone bronze.

    Some before and after pictures...
    Official Mechanical powered Crossbow build - Page 2 100_1439 Official Mechanical powered Crossbow build - Page 2 100_1440
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    • Post n°22

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    Post by whiteraven Sun Jul 01, 2012 8:27 pm

    This weekends updates.

    Official Mechanical powered Crossbow build - Page 2 100_1441 Official Mechanical powered Crossbow build - Page 2 100_1442 Official Mechanical powered Crossbow build - Page 2 100_1443 Official Mechanical powered Crossbow build - Page 2 100_1444 Official Mechanical powered Crossbow build - Page 2 100_1445 Official Mechanical powered Crossbow build - Page 2 100_1446 Official Mechanical powered Crossbow build - Page 2 100_1447
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    • Post n°23

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    Post by whiteraven Wed Jul 04, 2012 1:14 am

    Got my Swing Arm hinges designed... then made.
    Official Mechanical powered Crossbow build - Page 2 Hinge_10
    Official Mechanical powered Crossbow build - Page 2 100_1510

    My workspace currently.
    Official Mechanical powered Crossbow build - Page 2 100_1511
    Official Mechanical powered Crossbow build - Page 2 100_1512
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    • Post n°24

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    Post by whiteraven Mon Jul 09, 2012 7:54 pm

    More image updates.
    I designed this for the front end of the crossbow.
    Official Mechanical powered Crossbow build - Page 2 Mech_b13

    The idea is to make it out of something so I can cast it in aluminum for the final piece.
    So I brought some stuff with me to work over the weekend, because it gets Really Slow...
    Well Sunday was just about dead, so I got out some craft foam, scissors, super glue, and that drawing and came up with this.
    Official Mechanical powered Crossbow build - Page 2 Crossb11

    I'll further complete the details with paperclay and wax for the final piece. Then I'll invest it and burn it all out in a kiln. Very Happy
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    • Post n°25

    Official Mechanical powered Crossbow build - Page 2 Empty More Updates on the Mech Crossbow

    Post by whiteraven Wed Jul 11, 2012 4:58 pm

    So did a bit more sculpting on my jawbone end piece, as well as finished my trigger pattern.
    Official Mechanical powered Crossbow build - Page 2 100_1513 Official Mechanical powered Crossbow build - Page 2 100_1514 Official Mechanical powered Crossbow build - Page 2 100_1515 Official Mechanical powered Crossbow build - Page 2 100_1516

    And the trigger...
    Official Mechanical powered Crossbow build - Page 2 100_1517 Official Mechanical powered Crossbow build - Page 2 100_1518 Official Mechanical powered Crossbow build - Page 2 100_1519Official Mechanical powered Crossbow build - Page 2 100_1520

    Hope you guys don't mind all the pictures and slow progress.
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    Post by stoneagebowyer Wed Jul 11, 2012 6:32 pm

    Who cares how long it takes, and more pictures are a good thing. This looks just great. This thing is very gothic and horror-oriented. I just wanted Midnight Meat Train again a few days ago, and the climax to that movie immediately came to mind. If you haven't seen it, go rent it, Clive Barker story set in NY subways.

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    Post by whiteraven Fri Jul 13, 2012 9:40 pm

    So I'm just about finished with the overall design of the receiver group on my crossbow. Once I get it all done and converted to CAD files I'll send it to be cut in 1/8" steel.

    Official Mechanical powered Crossbow build - Page 2 Reciev10
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    Post by stoneagebowyer Sun Jul 15, 2012 5:47 am

    Are you using a machine shop for this, and if you don't mind my asking, how much will it run you to have someone do this work?
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    Post by chaz Sun Jul 15, 2012 6:27 am

    Raven

    Your reciever side plates seem to take a dip down to the nut, as the string is released it appears it will have bump up to overcome. Is that right? Just asking . The skeleton clock works look is very interesting. This thing will be quite the show piece.

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    Post by whiteraven Sun Jul 15, 2012 3:06 pm

    stoneagebowyer wrote:Are you using a machine shop for this, and if you don't mind my asking, how much will it run you to have someone do this work?

    I have a deal worked out with a friend to get everything water jet cut out of steel. I can get decent discounts on water jet and laser cutting though through a local hackerspace group.

    chaz wrote:Raven

    Your reciever side plates seem to take a dip down to the nut, as the string is released it appears it will have bump up to overcome. Is that right? Just asking . The skeleton clock works look is very interesting. This thing will be quite the show piece.
    Cnaz

    It does dip slightly towards the roller nut. was looking at several different crossbow trigger styles and I thought this may help in getting all the parts to fit within the 2" parameters of my receiver group with out any significant functional loss.

    Correct me if I am wrong, this is new to me.
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    • Post n°31

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    Post by whiteraven Tue Jul 17, 2012 6:20 pm

    Few more updates on the jaw piece for the tip of the crossbow. A little patience and some Paper-Clay and it seems to be turning out nicely. (Too bad the paper clay dries so slowly... work a little, wait alot, work a little...)

    Official Mechanical powered Crossbow build - Page 2 100_1521 Official Mechanical powered Crossbow build - Page 2 100_1522 Official Mechanical powered Crossbow build - Page 2 100_1523 Official Mechanical powered Crossbow build - Page 2 100_1524
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    Post by whiteraven Wed Jul 18, 2012 4:10 pm

    Then I used a local hackerspace's laser cutter to cut some plexi for a prototype.
    Official Mechanical powered Crossbow build - Page 2 Th_100_1504 Official Mechanical powered Crossbow build - Page 2 Th_100_1508 Official Mechanical powered Crossbow build - Page 2 Th_100_1509 Official Mechanical powered Crossbow build - Page 2 Th_100_1510 Official Mechanical powered Crossbow build - Page 2 Th_100_1507 Official Mechanical powered Crossbow build - Page 2 Th_100_1506 Official Mechanical powered Crossbow build - Page 2 Th_100_1505
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    Post by chaz Thu Jul 19, 2012 10:37 am

    Raven.

    Lookin' GREAT !

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    Post by whiteraven Sat Jul 21, 2012 2:33 pm

    Ok, so I am working a little rework on the whole trigger group. Someone Wise advised that if I kept closer to the original design it would function better.

    So updates coming soon.
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    Post by Geezer Sat Jul 21, 2012 3:56 pm

    Try an experiment for your paper-clay work. Do a couple of test pieces and stick them in a micro-wave. Start with just a few seconds time, and see how it speeds up the drying-time. Then work up to longer periods.
    I often use microwave to heat/speed up drying-times on small pieces... just avoid putting metals in your microwave, unless you're really fond of sparklies and mild explosions. Geezer

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    Post by whiteraven Sat Jul 21, 2012 3:59 pm

    I live in Arizona... when I'm NOT at work working on it I take it outside for a few minutes.

    It our dry heat its cured in no time.

    It's just in our A/C office that it takes 30-40 minutes.

    But thanks for the tip!
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    Post by whiteraven Tue Jul 24, 2012 12:01 am

    Jaw bone end piece update.
    Official Mechanical powered Crossbow build - Page 2 100_1525 Official Mechanical powered Crossbow build - Page 2 100_1526 Official Mechanical powered Crossbow build - Page 2 100_1527 Official Mechanical powered Crossbow build - Page 2 100_1528 Official Mechanical powered Crossbow build - Page 2 100_1529
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    Post by Basilisk120 Mon Jul 30, 2012 10:03 pm

    Wow this is looking awesome. You have put in a lot of great work. Can't wait to see it finished
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    Post by Gnome Tue Jul 31, 2012 1:50 pm

    Whiteraven, I giggle like a little girl whenever you post updates on this build. This some awesome, creepy, over the top dedication to a vision! Bravo.

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    Post by whiteraven Tue Jul 31, 2012 2:00 pm

    Thanks everyone. It's an intense build, but working little bits at a time makes it do able.
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