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    Official Mechanical powered Crossbow build

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    whiteraven
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    Official Mechanical powered Crossbow build

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

    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.
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    Re: Official Mechanical powered Crossbow build

    Post by whiteraven on Sun Jun 17, 2012 4:12 pm

    Few preliminary images. (sorry for the image quality, cell phones pic.)


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    Re: Official Mechanical powered Crossbow build

    Post by Ivo on Mon Jun 18, 2012 5:30 am

    Hey man,

    Glad to see the progress is in progress....and you have no idea how happy I am to finally be typing messages without holding *Shift* every time I want to start a new line...God, I hate that Facebook messenger. Laughing

    Think we went over a serious load of information and you are now truly > READY TO ROLLLL!!! ...even if it's a bumpy ride...we're here to put some monster tires on on for ya, keep us in check.

    Good Luck man, Looking forward to seeing this thing get done. Say hi to steam punk girls for me...haha!!!

    Ivo




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    Re: Official Mechanical powered Crossbow build

    Post by ferdinand on Tue Jun 19, 2012 1:27 am

    Ivo wrote:Hey man,

    Glad to see the progress is in progress....and you have no idea how happy I am to finally be typing messages without holding *Shift* every time I want to start a new line...God, I hate that Facebook messenger. Laughing

    Think we went over a serious load of information and you are now truly > READY TO ROLLLL!!! ...even if it's a bumpy ride...we're here to put some monster tires on on for ya, keep us in check.

    Good Luck man, Looking forward to seeing this thing get done. Say hi to steam punk girls for me...haha!!!

    Ivo
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    whiteraven
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    Re: Official Mechanical powered Crossbow build

    Post by whiteraven on Wed Jun 20, 2012 9:46 pm

    Worked on the trigger sculpt a bit today.







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    Re: Official Mechanical powered Crossbow build

    Post by whiteraven on Sat Jun 23, 2012 2:06 pm

    Trigger redone in just Balsa Wood.









    Still needs more sanding and finish work, but the overall look is there.

    Anyone got any detailing suggestions for me?
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    Re: Official Mechanical powered Crossbow build

    Post by whiteraven on Sun Jun 24, 2012 8:22 pm

    More fun with wood...





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    Re: Official Mechanical powered Crossbow build

    Post by stoneagebowyer on Mon Jun 25, 2012 2:40 pm

    Would you mind explaining what is going on. If I missed an explination, forgive me. This looks like a big jigsaw puzzle. The bone trigger looks great. Casting these parts?

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    Re: Official Mechanical powered Crossbow build

    Post by whiteraven on Mon Jun 25, 2012 3:11 pm

    Its the parts to my trigger group. These new pics may help.



    In the end I will be casting the parts in bronze.
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    Trigger Pattern Original finished!

    Post by whiteraven on Tue Jun 26, 2012 9:58 pm

    Alright, so a little bit of work and some color and here's how my tickler trigger looks so far.
    This is still the Balsa original, but I'll make a sand mold and get it cast in silicon bronze for the real finished piece.


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    Re: Official Mechanical powered Crossbow build

    Post by chaz on Wed Jun 27, 2012 10:50 am

    Hey Raven,

    What is the gear lookin' part all about? You are making progress. I don't know anything about bronze, so is that going to be strong enough for the trigger?

    Chaz
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    Re: Official Mechanical powered Crossbow build

    Post by Basilisk120 on Wed Jun 27, 2012 11:12 am

    This is going to look really good when it gets cast.

    Just a couple of observations about the roller nut and sear.

    1. Noticed that the sear has an angle to it. This could cause a problem with that setup locking up when a strong load is applied to the roller nut. If the trigger mechanism causes the roller nut to roll back before release its likely going to be an issue. You may have already looked into this and that angle doesn't look too bad considering the rotation of the sear. Btu just tossing it out there.



    2. The contact area between the sear and roller nut looks rather large. This can cause extra friction and higher trigger force than needed. I might look into shaving off the top of the sear. Make it a bit shorter. Should help give a "cleaner" trigger pull.



    Oh and one last thing. If you do shorten the trigger Pull it wouldn't be a bad idea to round out the inside corner on the roller nut. Make that corner less of a stress riser.



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    Re: Official Mechanical powered Crossbow build

    Post by Basilisk120 on Wed Jun 27, 2012 11:16 am

    chaz wrote:Hey Raven,

    What is the gear lookin' part all about? You are making progress. I don't know anything about bronze, so is that going to be strong enough for the trigger?

    Chaz



    Bronze should be strong enough and the parts look fairly bulky. Brass, Bronze and Copper do have a reputation for being week but I think that has more to do with them being rather ductile and most people experiance are with weaker alloys. There are some rather good alloys out there strength wise.



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    Re: Official Mechanical powered Crossbow build

    Post by Gnome on Wed Jun 27, 2012 2:23 pm

    This ig getting interesting. Don't skimp on the photos of the mold making and casting process! Even if this bow doesn't work at all, it will still be a work of art. If it also happens to turn out fully functional, it will be a piece of awesome.

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    Re: Official Mechanical powered Crossbow build

    Post by whiteraven on Wed Jun 27, 2012 5:24 pm

    Basilisk120 wrote:This is going to look really good when it gets cast.

    Just a couple of observations about the roller nut and sear.

    1. Noticed that the sear has an angle to it. This could cause a problem with that setup locking up when a strong load is applied to the roller nut. If the trigger mechanism causes the roller nut to roll back before release its likely going to be an issue. You may have already looked into this and that angle doesn't look too bad considering the rotation of the sear. Btu just tossing it out there.



    2. The contact area between the sear and roller nut looks rather large. This can cause extra friction and higher trigger force than needed. I might look into shaving off the top of the sear. Make it a bit shorter. Should help give a "cleaner" trigger pull.



    Oh and one last thing. If you do shorten the trigger Pull it wouldn't be a bad idea to round out the inside corner on the roller nut. Make that corner less of a stress riser.

    Could you do a redraw on it to show me what you mean?
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    Re: Official Mechanical powered Crossbow build

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

    Yeah not a problem



    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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    Re: Official Mechanical powered Crossbow build

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

    More like this?



    Will have to redraw a bit more tomorrow, pending some materials I got today. Wink
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    Re: Official Mechanical powered Crossbow build

    Post by stoneagebowyer on Thu Jun 28, 2012 12:02 pm

    I get all the wooden parts now, Whiteraven. This project is really facinating.
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    Re: Official Mechanical powered Crossbow build

    Post by whiteraven on 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.



    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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    Re: Official Mechanical powered Crossbow build

    Post by stoneagebowyer on 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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    Re: Official Mechanical powered Crossbow build

    Post by whiteraven on 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...
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    Re: Official Mechanical powered Crossbow build

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

    This weekends updates.

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    Re: Official Mechanical powered Crossbow build

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

    Got my Swing Arm hinges designed... then made.



    My workspace currently.

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    Re: Official Mechanical powered Crossbow build

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

    More image updates.
    I designed this for the front end of the crossbow.


    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.


    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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    More Updates on the Mech Crossbow

    Post by whiteraven on 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.


    And the trigger...


    Hope you guys don't mind all the pictures and slow progress.

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    Re: Official Mechanical powered Crossbow build

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