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Question: Stocks with thumb holes.

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Question: Stocks with thumb holes.

Unread postAuthor: chinnerz » Sat Jan 02, 2010 2:20 am

Im making a small barrel air rifle. I am kind of new to all of this, but i seem to have made the working parts with no issue what so ever. But i have a question about the thumbhole component of the stock.

So you guys have a reference here is what my rifle is going to look like. Note there is no thumb hole.
Image

The questions is where does it go ?

i know its not just a hole, there some tapering of the wood around it.
What does this tapering look like?

How large is this hole meant to be?

thanks in advanced,
chinnerz

p.s. im not the best at drawing, so this is not to scale
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Unread postAuthor: jackssmirkingrevenge » Sat Jan 02, 2010 2:29 am

Here's some examples for inspiration:

Image

Image

Image

Image

Image

Image

Image

Image
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Unread postAuthor: chinnerz » Sat Jan 02, 2010 2:35 am

thanks for that jack, they look quite complex
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Unread postAuthor: jackssmirkingrevenge » Sat Jan 02, 2010 2:42 am

You don't even need a full stock, you would just make a pistol grip and buttpad like this:
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Unread postAuthor: absinthe » Sat Jan 02, 2010 3:05 am

Image

my stock
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Unread postAuthor: chinnerz » Sat Jan 02, 2010 3:20 am

yeah... wow that like was my first plan.
but if you see you have a good 25 cm of wood with nothing sitting on top of it. which is why i decided to move the trigger 20 cm forward so i can save space.

Image
10 second sketch
idea number 1 ^^
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Unread postAuthor: spudamine » Sat Jan 02, 2010 4:25 am

I Like the way you've gone for more of a bullpup design, a lot of people don't like the look of a bullpup but when you're building a spudgun you can't afford to be picky when power is at stake and you can get a good bit extra out of those 20cm without compromising the comactness.
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Unread postAuthor: chinnerz » Sat Jan 02, 2010 8:51 pm

yeah that was the idea :P thanks for compliments
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Unread postAuthor: jackssmirkingrevenge » Sun Jan 03, 2010 1:12 am

Here's an idea for making life even more difficult, a hydraulic trigger system ;)
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Unread postAuthor: chinnerz » Sun Jan 03, 2010 1:33 am

jackssmirkingrevenge wrote:Here's an idea for making life even more difficult

gee thanks....

hmmm hydraulic trigger system.
well i bet its one of those things which sounds harder than it is, i could probably use a few syringes some tubing and some oil.

however you cant beat a long stick in its simplicity
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Unread postAuthor: jackssmirkingrevenge » Sun Jan 03, 2010 1:35 am

chinnerz wrote:however you cant beat a long stick in its simplicity


In this case, certainly, since your trigger is in line with the valve.
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Unread postAuthor: POLAND_SPUD » Sun Jan 03, 2010 10:25 am

you don't need oil.. water will work just fine

but instead of choosing this method you can buy a small QEV to pilot the main valve... that's much simpler
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Unread postAuthor: chinnerz » Sun Jan 03, 2010 9:18 pm

what are QEV's used in? airsoft or something?
well here in Australia you cant really find qev's that easily, i guess i could buy one on line for $50 if it makes a huge difference....
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Unread postAuthor: jackssmirkingrevenge » Sun Jan 03, 2010 10:28 pm

A QEV is basically a commercially available piston valve, if you can get your hands on one it will save you a lot of fabrication.
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Unread postAuthor: chinnerz » Sun Jan 03, 2010 11:17 pm

so you use a piston valve to actuate a piston valve?
damn..... :shock:
confusing... :?
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