Search found 326 matches

by cammyd32
Mon May 09, 2016 4:51 pm
Forum: Off-Topic Hobbies
Topic: So... who's about?
Replies: 8
Views: 1204

Re: So... who's about?

I'm sort of around, I pop in from time-to time to see if anything exiting has happened, I've had a few projects going myself in what little free time life has given me, but nothing special, or complete for that matter.
Things really just seem to be very quiet here at the moment,
by cammyd32
Sat Mar 05, 2016 4:12 pm
Forum: Pneumatic Cannons
Topic: schrader valve install
Replies: 10
Views: 1942

Re: schrader valve install

I have used schraders like that up to pressures far in exceeding what would be safe for PVC, so yes I believe it would be suitable, just make sure you tighten it up tight.
by cammyd32
Wed Feb 10, 2016 10:47 am
Forum: BB, Airsoft, and Pellet Guns
Topic: a self-made semi-automatic rifle with a piston valve
Replies: 6
Views: 2458

Re: a self-made semi-automatic rifle with a piston valve

I like the improvised look of the whole thing, good job!
by cammyd32
Wed Jan 20, 2016 4:33 pm
Forum: Pneumatic Cannons
Topic: .50 Caliber Copper Air Gun
Replies: 3
Views: 1133

Re: .50 Caliber Copper Air Gun

The smaller the better with regard to that! That volume of gas in spudding terminology is referred to as the 'pilot volume' the smaller it is the faster your valve will open, but don't go overboard. My advice would be to copy the size of some existing designs, then it makes it a lot easier to troubl...
by cammyd32
Wed Jan 20, 2016 9:09 am
Forum: Pneumatic Cannons
Topic: .50 Caliber Copper Air Gun
Replies: 3
Views: 1133

Re: .50 Caliber Copper Air Gun

Picture isn't loading for me, but I have a reasonable idea of what you're trying to achieve. As a general rule I follow, air chamber as big as you can get it, I know a lot of people will talk about diminishing returns and increased fill time, but that aside, it's not going to be detrimental to perfo...
by cammyd32
Mon Oct 26, 2015 5:41 pm
Forum: Pneumatic Cannons
Topic: New Member need help with his first air riffle
Replies: 3
Views: 531

Re: New Member need help with his first air riffle

How big should the chamber be? how long is a piece of string? This question depends on how much power you want from your launcher, try using a brilliant free bit of software called GGDT to estimate your power and performance and have a play around with it, although from what people have gone with be...
by cammyd32
Mon Oct 26, 2015 11:40 am
Forum: Pneumatic Cannons
Topic: New Member need help with his first air riffle
Replies: 3
Views: 531

Re: New Member need help with his first air riffle

Well you'd have to buy an adaptor to convert the threads, but yes they would link together.
The design as you've described it would work too, with a bit of searching round the showcase section you can probably find half a dozen people who have used a similar set-up.
Welcome to the site
by cammyd32
Fri Jul 03, 2015 6:01 pm
Forum: Ammo & Parts
Topic: Discontinuous Rifling
Replies: 2
Views: 1196

Re: Discontinuous Rifling

I am no ballistics expert, but I somehow have a feeling that having two barrels attached halfway in either combination would probably negate any accuracy gains from the rifling, However if you do choose to do this, I would put the rifled section first, this way the pellet doesn't hit the rifled sect...
by cammyd32
Mon Jun 22, 2015 6:55 pm
Forum: BB, Airsoft, and Pellet Guns
Topic: Classic and simple .25 cal 'sniper' rifle
Replies: 5
Views: 2128

Re: Classic and simple .25 cal 'sniper' rifle

Try searching for 'countersunk magnets' they are basically the same but there appears to be quite a large selection of them on ebay fairly cheap with free international shipping. Otherwise, what you could do is simply file a notch into the barrel, doesn't need to go all the way through, but just eno...
by cammyd32
Sat Jun 20, 2015 4:08 pm
Forum: Pneumatic Cannons
Topic: 'O' ring use for sealing pistons etc.
Replies: 3
Views: 710

Re: 'O' ring use for sealing pistons etc.

If you have quite a strong return spring, or are using heavy ammo, you might find o rings can make quite a bit of difference, but it's worth noting that even if you decide to use o-rings you are going to have to fit the piston and cylinder very closely. With regard to designing o rings, I'll give so...
by cammyd32
Fri Jun 05, 2015 7:32 am
Forum: General How-To & Discussion
Topic: Is spudding dead?
Replies: 102
Views: 26231

Re: Is spudding dead?

As a member who started upon this hobby at a very young age, and being here from what could be considered the 'industrial revolution of spudding' throughout it's gradual decline I can speak from experience about the behaviour of the 'modern new member', and can give some observations of how advancem...
by cammyd32
Mon May 18, 2015 3:28 pm
Forum: Pneumatic Cannons
Topic: 6mm Compact Copper Air Gun
Replies: 18
Views: 5564

Re: 6mm Compact Copper Air Gun

If you would like to give it a try you are more than welcome to, although this probably isn't a task for the faint hearted, or one without machine equipment. Seeing as I drew the designs for this a few years ago, not sure if I still have them on my pc, or a programme to open them with, so that might...
by cammyd32
Mon May 18, 2015 3:19 pm
Forum: Pneumatic Cannons
Topic: True Bolt Action 6mm Cannon
Replies: 11
Views: 4044

Re: True Bolt Action 6mm Cannon

Thanks for all the kind comments guys, it is really appreciated. And to answer some questions (from the top): Would recommend trying tung or linseed oil Thanks Gippeto, yeah I've been told by a few people linseed would be a good option, when I next get time to alter it I'll sand the stock down and r...
by cammyd32
Wed May 06, 2015 9:47 am
Forum: Pneumatic Cannons
Topic: True Bolt Action 6mm Cannon
Replies: 11
Views: 4044

True Bolt Action 6mm Cannon

I was going to wait until I had finished this build properly to release it to the world, but what with the recent talk of death of spudding I decided to come out of hiding and post it anyway. After for the first time getting access to multiple very very expensive machine and cnc tools, for my first ...
by cammyd32
Wed May 06, 2015 8:57 am
Forum: BB, Airsoft, and Pellet Guns
Topic: Need opinions/advice on a bb gun design
Replies: 25
Views: 3757

Re: Need opinions/advice on a bb gun design

Picture hasn't shown, sounds good though, have you got another link? With regards to making the piston, a modified whole medical syringe would work, and would be cheap to replace, but I always found them difficult to work with as they aren't exactly designed with structural rigidity in mind. (eg qui...