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New Hammer for PCP Guns

A place to ask general spud cannon related questions.
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New Hammer for PCP Guns

Unread postAuthor: maverik94 » Tue Nov 10, 2009 6:54 pm

Ok, so I have been fiddling around with some ideas for a good hammer for my pcp gun. I have tried the normal cylindrical hammer design, and it worked.....about 10% of the time. Anyway, I have had the idea of using a hammer like a hammer in a Flintlock and Percussion-Cap Guns. So here is what I have come up with. It is pretty simple, I built it in about 30 minutes, but it is functional and reliable, especially considering the time spent and the fact that it's just a prototype. Well, here is the hammer/trigger setup:
Image
Here is the hammer cocked:
Image
Here are the parts of the setup labeled:
Image
Here is a picture of the internals of a real flintlock for comparison:
Image
Anyway, I thought I'd show this to y'all. If you have any questions, just ask!
-Maverik94
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Unread postAuthor: jackssmirkingrevenge » Wed Nov 11, 2009 1:09 am

Looks good, now pull off the trigger from a blowgun and mount it so the hammer strikes the stem et voila, you've got yourself a hammer valve ;)
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Unread postAuthor: inonickname » Wed Nov 11, 2009 3:43 am

I tried something similar, though my pivot points were set up poorly so it didn't work well.

Nice work
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Unread postAuthor: psycix » Wed Nov 11, 2009 5:54 am

Looks like a good start. Don't forget you can add weight to the hammer.
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Unread postAuthor: Demon » Wed Nov 11, 2009 7:21 am

Here is a hammer that i will be using for my own pcp

but im not sure it suits your needs as it is for use with an inline barrel(for an airforce condor)

Even, is this design ok or it wont work for some reason?
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Unread postAuthor: boyntonstu » Wed Nov 11, 2009 8:37 am

My thought concerns the hammer force.

If the trigger spring and hammer spring were reversed and the hammer spring pulled from a point further away from the pivot, you would have a stronger hammer.

Is the force of the hammer the major criteria?

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Unread postAuthor: jackssmirkingrevenge » Wed Nov 11, 2009 9:45 am

boyntonstu wrote:Is the force of the hammer the major criteria


Stronger hammer force = faster opening time and longer dwell time = more power but less shots per pressurised reservoir.

You can vary it by changing the spring strength and travel, as well as the actual weight of the hammer. It pays to do some tuning to make sure you're not letting out too much air per shot.
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Unread postAuthor: maverik94 » Wed Nov 11, 2009 4:07 pm

Thanks for all the comments!, well, as far as weight, I think this with a longer mainspring will work fine, I used the same spring in an inline (like demon's) hammer, and it opened my gun, and this hammer is more than twice as heavy than that one, so I'm not too worried. I will post more pics and results as I do more work!
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Unread postAuthor: Brian the brain » Wed Nov 11, 2009 5:09 pm

Is the force of the hammer the major criteria?


Yes.
or maybe no.. :?

If you meant " the springforce" than no...
The force the hammer exserts on the valve depends a lot on the weight of the hammer too.


Simply think of it this way.The valve needs a lot of force to open it.

What would work better to move a brick? firing a 6mm airsoft bb at it , or a 30 pound dumbell at 100 miles an hour?

Both weight and springforce make up the energy to move it.
You need a little of both.A weak spring can't accelerate a heavy hammer.

Good job at showing the inner workings of my B2TB...and of course Shatterhand. :roll: :D

You could do what I did and curl a spring around the axle of the trigger and support one side of it against the sear axle.
The other end is curled around the back of the trigger.
This makes it all much smaller.

Some doorhandles are equipped with a flat coilspring.I used two on Shatterhands hammer.
Again, this makes it more compact.
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Unread postAuthor: maverik94 » Wed Nov 11, 2009 7:14 pm

Oh, BTB, I didn't realize this was how your hammer on Old Shatterhand worked! Cool, I wasn't trying to steal you idea, In fact i didn't know if anyone had used this type of hammer on SF yet. I just came up with this while studying the internals of flintlocks/Percussion cap guns. I didn't have time to work on it at all today, and I probobly won't have time either tomorrow, but come the weekend I'll be able to work on this more and then I'll post my progress. Again, thanks for the comments, and BTB, is there any way you can post a picture or drawing of what you are talking about? I don't quite undertand what you are describing above. Thanks!
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Unread postAuthor: psycix » Thu Nov 12, 2009 3:32 am

What would work better to move a brick? firing a 6mm airsoft bb at it , or a 30 pound dumbell at 100 miles an hour?

Unless you fire the BB at just about 1% of the light speed or more. :D
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Unread postAuthor: VH_man » Thu Nov 12, 2009 6:59 am

Funny.... I just drew up something similar to pilot my .177 stick gun.... mine is a bit more complex, however. I might steal your idea :D

Good idea to construct it on a board first. Helps you design your complex mechanisms without worrying about where to put stuff at that moment....
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Unread postAuthor: maverik94 » Thu Nov 12, 2009 9:32 pm

Ok, thats fine VH_man, As you can see, I'm not the first to come up with the idea, actually it's been around for a few centuries, so feel free to, as you said, "steal it".
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Unread postAuthor: Major Collins » Sun Nov 22, 2009 5:29 am

hrmmm it looks as if it would work just on the idea of semi auto if you use the bleed in valve idea of havering 2 ball valves one to fire ,one to release air from a primary chamber into a secondary chamber .. ive head people use regulators for more shots... how would this work ? does the air get into the forced into the secondary chamber through a regulator? eg have a primary chamber that can hold 400 psi but when you bleed air into the secondary chamber you have the pressure of 125 psi but you can still take 5 shots.. (dosent add up lol 5 shots of 125 psi = 525 psi ) can someone please explain?
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Unread postAuthor: Brian the brain » Sun Nov 22, 2009 7:42 am

Oh, BTB, I didn't realize this was how your hammer on Old Shatterhand worked! Cool, I wasn't trying to steal you idea,


I have recently invented something called "the wheel"
Also I would like to patent the idea of rubbing two sticks to get fire..
:D
There is nothing about any of my guns you can't copy.If I would want to keep it to myself I wouldn't be posting it here ,would I?
The only trick I added is a square axle to bring the hammer out to the right side of the body..

hrmmm it looks as if it would work just on the idea of semi auto if you use the bleed in valve idea of havering 2 ball valves one to fire ,one to release air from a primary chamber into a secondary chamber .. ive head people use regulators for more shots... how would this work ? does the air get into the forced into the secondary chamber through a regulator? eg have a primary chamber that can hold 400 psi but when you bleed air into the secondary chamber you have the pressure of 125 psi but you can still take 5 shots.. (dosent add up lol 5 shots of 125 psi = 525 psi ) can someone please explain?


indeed..This is about hammervalves and hammers....

For the twin BV idea you might wanna check this:
Image
Topic found here:

<a href="http://www.spudfiles.com/forums/hard-copy-shotgun-t3735.html">*click but don't kick*</a>
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