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

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4 posters

    SCM Twinbow trigger

    traxxas_slash7
    traxxas_slash7
    Fresh Blood

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    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows


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    SCM Twinbow trigger - Page 2 Empty SCM Twinbow trigger

    Post by traxxas_slash7 Sat Apr 21, 2012 2:56 pm

    First topic message reminder :

    Hello i'am new to this awesome forum. Can anyone explain to me how the trigger on the SCM Twinbow functions. Any and all help will be greatly appreciated.
    Ivo
    Ivo
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    SCM Twinbow trigger - Page 2 Empty Re: SCM Twinbow trigger

    Post by Ivo Thu May 17, 2012 7:31 pm

    Any word yet how SCM resets the toggle action?

    I think I have it figured out. Very Happy Now just need to draw it out...(as always short on time, as always doing stuff in my head SCM Twinbow trigger - Page 2 186986 )

    Also wrote to Moon, hopefully he'll stop by to hang with us.

    Ivo
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    SCM Twinbow trigger - Page 2 Empty Re: SCM Twinbow trigger

    Post by Ivo Sun May 20, 2012 5:41 am

    So yeh...spoke with Moon about all this stuff. Seems we're on the right track... Smile

    So get ready, because surprisingly I had much better luck with this design than with the 4X German trigger I'm working on.



    Sorry, left the video running a bit too long there. Laughing

    Took me about an hour to get it to work more or less properly...Working Model gives me an error, but even if I let it keep rolling things turn out fine (just real slow processing/rendering...haha, that toggle action is even screwing with the computer, so we're not alone here SCM Twinbow trigger - Page 2 576186 )

    Ok, now on with the update...

    If
    the parts making up the toggle action are not just links, if in fact
    they possesses multiple functions and bend the other way, then that
    would explain the weird shape of other components. SCM Twinbow trigger - Page 2 2860157027



    SCM Twinbow trigger - Page 2 Scm_ex10

    Red ~ Top toggle segment (3 functions: Toggle action, trigger reset, transitional lever)
    Blue ~ Bottom toggle segment
    Orange ~ Spacer
    Pink ~ Grip safety (blocks the red toggle segment)

    So, those damn green components. Cool Took me a while, but I got them figured out. Gotta tell you - really a marvel, this trigger. drunken

    The top green bar had my mind running laps, the chain reaction I'm about to explain made it far from obvious. But then a quick guess is all it took. I popped in an extension spring between the green bar component and the red toggle segment (I think on the original trigger it's a torsion spring, but anyway...) the spring pulled the two parts together with the green bar resting on the back of the claw and the trigger reset instantly after release.

    SCM Twinbow trigger - Page 2 Tb210

    Good news ...and bad.

    Since the trigger resets automatically, there is no way to load the crossbow again. Well...That's where the second greed component comes into play. Smile

    What it does is basically keep the claw from closing after release.

    Ok, so...After the claw releases the string, the green component shifts forward (thanks to the compression spring between it and the trigger) andacts as a stop - preventing the claw from coming down.

    SCM Twinbow trigger - Page 2 Tb110

    Now when the string is pulled back, it shifts the stop back, allowing the claw to drop and for the green bar to reset the toggle action.

    An interesting bit in this trigger is the Orange spacer component that I drew in the diagram explaining the reset bar function, but didn't mention the spacer...well that spacer is what the red toggle segment rests against keeping the trigger locked.

    SCM Twinbow trigger - Page 2 Tb310

    Thought I'd go into a bit more detail on that part in case it wasn't made clear in the video.

    Also...Didn't add the grip safety in the video, but it's pretty obvious how that works. Smile


    Merry Christmas! santa

    Ivo

    PS:

    On OSS Toggle action trigger...

    Wow the friction must be pretty low even without any bearings to be able to use gravity to reset the trigger Smile.

    Perhaps I'll draw that one up too. I'm really getting a kick out of this little mech testing app. SCM Twinbow trigger - Page 2 524936
    traxxas_slash7
    traxxas_slash7
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows


    Posts : 10
    Join date : 2012-04-21

    SCM Twinbow trigger - Page 2 Empty Re: SCM Twinbow trigger

    Post by traxxas_slash7 Sun May 20, 2012 1:29 pm

    Thanks Ivo for spending so much of your time just to explain this to me Very Happy. This is definitely the most interesting trigger i have seen to date. Your diagrams and videos make this very easy to understand. Now all thats left to do is break out the machining tools sander.
    Ivo
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    SCM Twinbow trigger - Page 2 Empty Re: SCM Twinbow trigger

    Post by Ivo Mon May 21, 2012 4:16 am

    Glad it helps. Smile (busting my ass for you here Mad )...haha! Laughing


    The build you have in mind is pretty crazy, so I thought I'd push it an extra inch to help out. Hope we can participate in the planning of the actual machine too, lots of cool little bits to discuss there....it's going to be a bull pup right?

    Keep us posted and good luck! Very Happy

    Ivo
    traxxas_slash7
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    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows


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    Join date : 2012-04-21

    SCM Twinbow trigger - Page 2 Empty Re: SCM Twinbow trigger

    Post by traxxas_slash7 Tue Jul 31, 2012 4:53 pm

    Sorry I havent posted in a while. After roughly machining most of the trigger components out of some scrap 1/4 steel I decided I dont like the weight. I'll be ordering some 1/4 7075 t6 tempered aluminum, that should make for a strong yet light weight trigger. does anyone have any recommendations on bearing size for the trigger components to turn on?

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