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.
So yeh...spoke with Moon about all this stuff. Seems we're on the right track...
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.
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 )
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.
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. Took me a while, but I got them figured out. Gotta tell you - really a marvel, this trigger.
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.
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.
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 astop - preventing the claw from coming down.
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.
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.
Merry Christmas!
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 .
Perhaps I'll draw that one up too. I'm really getting a kick out of this little mech testing app.
Thanks Ivo for spending so much of your time just to explain this to me . 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 .
Glad it helps. (busting my ass for you here )...haha!
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?
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?