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Spring-powered BB rifle

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Spring-powered BB rifle

Unread postAuthor: D-Roc » Mon Jun 26, 2006 2:11 pm

It's going to work like this. You cock the cannon. When you pull the trigger the bolt slams forward hitting the BB.

The whole thing will be made out of steel so that it can withstand the slam of the bolt. I want to maybe use a 100lb. spring. Then I build the cocker so I can cock it with my foot or something.

What should I put at the end of the bolt so that it won't chip the BBs? And what should I use for the bolt stopper so that the gun doesn't break apart at the slam. And what can hold a 100lb. spring back?

It's going to work something like this.
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Unread postAuthor: Rambo » Mon Jun 26, 2006 4:09 pm

I think the idea don't smells right.No way to get any amount of power.
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Unread postAuthor: )DEMON( » Mon Jun 26, 2006 4:20 pm

Big problem,you are wasting energy.When the bolt strikes the bb it will cause it to fly a few feet at the most, rather replace the bolt with a piston, like a nerf gun.
Scroll down on this web site: http://www.compasseco.com/technical.html

And take a looky here: http://nerfhaven.com/homemade/boltsniper_far/
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Unread postAuthor: D-Roc » Mon Jun 26, 2006 5:05 pm

So a plunger or piston is better than a ramrod?
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Unread postAuthor: beebs111 » Mon Jun 26, 2006 6:38 pm

much, instead of just striking the object, it uses the built force to propel the projectile with air pressure
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Unread postAuthor: D-Roc » Mon Jun 26, 2006 11:09 pm

How much FPS you guys think I will reach with a 100lb. spring?
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Unread postAuthor: Rambo » Mon Jun 26, 2006 11:50 pm

With out a piston the bb will fly no more then 5m.Sick of stupid ideas.
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Unread postAuthor: )DEMON( » Tue Jun 27, 2006 1:47 am

Most bb guns don't even use 10lb springs,you are really going overkill with one of those unless you are making something more like an air rifle.
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Unread postAuthor: Benny » Tue Jun 27, 2006 3:23 am

good idea to use a hop-up too, it wont shoot very far unless you build up a decent ammount of pressure, by the way, how many psi does an Air rifle build up when it fires?
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Unread postAuthor: Bluetooth » Tue Jun 27, 2006 8:08 am

I dont think you are going to be able to set up i trigger that will hold back a 100lb spring. :?
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Unread postAuthor: Jakal444 » Tue Jun 27, 2006 8:15 am

This is essentially a BB gun without the piston. All you need to do is cut off that protuding piece that is meant to strike the BB and put an O-ring around the larger part. Then it will act like a piston. Large chamber, into a smaller barrel. Found a way for it to load whenever you pull back the cocking handle.
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Unread postAuthor: D-Roc » Tue Jun 27, 2006 1:24 pm

Nah, I'm going to use the plunger thing. I have a spring-powered nerf gun that uses a plunger so I'll just base it on that. How much PSI you think it will build up in the plunger?
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Unread postAuthor: zaketus » Tue Jun 27, 2006 1:50 pm

If you have nerfgun, that you want to mod to BB-gun, then just replace barrel with smaller one...simple.
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Unread postAuthor: beebs111 » Tue Jun 27, 2006 1:58 pm

replace the barrell with a smaller one, and upgrade the spring to a 15lb spring, and a new trigger and cocking lever, then, you will have one kickass bb gun
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Unread postAuthor: D-Roc » Tue Jun 27, 2006 2:02 pm

Well I have a 100lb. spring already...So...And I don't think airsoft guns can handle this spring. I'm going to make this from scratch.
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