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Bar stock trigger and nut

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davereap
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Age: 65
Location: Ashford, Kent, UK

Bar stock trigger and nut

Post by davereap on Wed Oct 26, 2011 1:07 pm

I am trying to replace the Nut and trigger mechanism with something as simple as possible..

My idea is to use 5mm x 20mm flat aluminium bars , they should have a minimum of shaping, drilling to make them work.

I have a minimum of metal working tools , but can manage to drill, file and cut, but not produce the more complicated triggers I have seen

I've been designing on sketchup and have some rough ideas, but what are your thoughts





be aware these are not finished drawings but are to show the idea... dave

davereap
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Re: Bar stock trigger and nut

Post by davereap on Thu Oct 27, 2011 4:21 pm



Ive made a wooden mockup, mostly its ok, the firing mechanism is fine but the "sprung on saftey" has to be held in the fire position to cock the mechanics.. no good as I havnt got three hands

ANY IDEAS all I can think to use is a quick release catch of some kind to hold the safety at the fire/unsafe position..

So I would have to cock it.. then manually engage the safety before I load up..

Todd the archer
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Re: Bar stock trigger and nut

Post by Todd the archer on Fri Oct 28, 2011 12:25 am

Overall I think you design will work, except maybe you could come up with a different saftey design.



Here a discussion on saftey's

http://thearbalistguild.forumotion.com/t431-trigger-safety-designs



Todd

davereap
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Re: Bar stock trigger and nut

Post by davereap on Fri Oct 28, 2011 12:04 pm

Thanks I will have a look through there... The first safety idea is already gone and ive come up with a different solution, its still manual for safe, on and off, but it can be held unsafe for firing and cocking by a simple toggle...
Ive also moved the safety to the rear in the body.... Its a step better, but not the automatic safety that I desire..

The trigger mechanism works very well, Ive given each part mechanical advantages to make the firing esaier.. It doesnt take any force to trip the thing, but its not under any great strain so there is no friction.. But it is noticably easier/lighter than my jaguar crossbow's trigger..

I do wish I'd made it in metal, as it seems to be good the first time..

pic 1 cocked and safe



pic 2 cocked and unsafe



pic 3 ...fired .... in unsafe position which allows for cocking


davereap
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Fresh Blood Doesn't meanI'm new to crossbows

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Re: Bar stock trigger and nut

Post by davereap on Sun Oct 30, 2011 8:17 am

Clarification of the last pic..

The trigger can be tripped by pushing the safety with your thumb against its spring loading, then squeezing the bar..

By then engaging the toggle latch the safety can be kept forward and the mechanism cocked, the toggle is then released and the safety pops up. then the trigger mechanism is blocked from firing

Regerald
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Re: Bar stock trigger and nut

Post by Regerald on Sun Oct 30, 2011 11:24 am

Nice mech, will surely work. But in this case you have relatively large "nut", so you can face a problem that string is jumping over a bolt. Would be better to make this nut as light as you can, and in ideal even reduce its size..


Last edited by Regerald on Sun Oct 30, 2011 11:25 am; edited 1 time in total (Reason for editing : tupo)

davereap
Fresh Blood

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I'm new to crossbows


Fresh Blood Doesn't meanI'm new to crossbows

Posts: 10
Join date: 2011-10-06
Age: 65
Location: Ashford, Kent, UK

Re: Bar stock trigger and nut

Post by davereap on Mon Oct 31, 2011 9:26 am

yes thanks good points.. Its a rough work in progres, so ive a long way to go, and I am trying to get something simply/crudely made and different to work.. Unfortunately I no longer have workshop facilities so have only the minimum of tools.. machining is out of the question, simple hand tools only are available

The mechanics are set so the nut is rotating at the level of the guide rail along the centre..as in the pic above it shows the front of the nut up a bit, it actually can rotate well into the body, past the guide rails, which are still to be fitted, but is then retrived by the elastic band, so the cocking part stands proud for when the string gets pulled back.

I will also be fitting a guide over the bolt which hopefully will stop the string going over..and a spring to hold the bolt/arrow.. I will post more pics as I progress, there is a lot more to do..

At the moment the Nut will take normal nocked arrows onto the string.. I have read that flat or slightly cupped ends are best, along with much thicker strings, time will tell.. Its just some ideas to try.. with a thick string and guides over and under the string should be stopped from jumping

Ive been reading up and old setups dont have the full bolt length resting in a guide.. friction being a problem, they have the bolt's front fractionally raised, ususally the head doing the job.. However my shop bought ones dont do that.. so whats the best way..

Ivo
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Re: Bar stock trigger and nut

Post by Ivo on Wed Nov 09, 2011 11:53 pm

Can't believe I missed this. I do have a few suggestions...tried the stacked nut a few times with varying success. I'm not sure of what kind of bow you're building, but perhaps this will help a bit.





Similar to what Regerald showed on here once. http://thearbalistguild.forumotion.com/t268-fantasy-style-crossbow

And mounting it on the bow...this guy has a pretty cool solution. Smile

AboMickey on Hidden Arrow/Dart Launcher wrote:

Ok so I continued to work on this thingie, and now
it's to a point where all you xiphoid enthusiasts out there can start
drooling




I think I'm gonna paint it like Liger Zero
It
has a problem though, It's really @$#!&* hard to load. I'm thinking
of making some kind of rod that can push the string back
But there is so little space for such things.
The trigger works and thats all I have to be exited about for now.

And don't sweat the hand tools... hand tools are cool, takes a bit longer, but gives you time to really think about what you're doing. Wink

That's all I got time for now, but feel free to drop some thoughts/questions...I'm sure you won't be left hanging. Smile

Ivo




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