Search found 286 matches

by FighterAce
Fri Mar 25, 2016 11:05 am
Forum: General How-To & Discussion
Topic: AT89S8253 based chronograph
Replies: 10
Views: 3042

Re: AT89S8253 based chronograph

Hey if you think you can reproduce this, go ahead. I couldn't find my last code with m/s to km/h and fps conversion so I'm posting the original one I submitted in paper. Dim A As Byte , Brojac As Word , Broj As Long , Ukup As Long , Time As Single , V As Single , Targ As Iram String * 6 $crystal = 2...
by FighterAce
Tue Jul 22, 2014 7:23 am
Forum: Pneumatic Cannons
Topic: Air Rifle Stock Help
Replies: 6
Views: 809

Re: Air Rifle Stock Help

I highly recommend carving a stock out of a block of wood. Just make sure you're not using the lowest quality wood. Don't repeat my mistake of putting a lot of work into a wooden stock and then have the wood deteriorate after a few years ;) The best way of carving out the cavities would be with a ro...
by FighterAce
Thu Jul 03, 2014 1:09 pm
Forum: General How-To & Discussion
Topic: AT89S8253 based chronograph
Replies: 10
Views: 3042

Re: AT89S8253 based chronograph

Jack that really reminds me of the first ballistic chronograph designed by Kiryako Arvanetakis. I've had an entire segment about him in my presentation ;) Nice to see the design hasn't been forgotten, or perhaps reinvented? Jimmy, the whole point of my graduation project was using the things I was t...
by FighterAce
Tue Jun 10, 2014 9:20 am
Forum: General How-To & Discussion
Topic: AT89S8253 based chronograph
Replies: 10
Views: 3042

AT89S8253 based chronograph

Last week I've defended my graduation project and got an excellent mark so I guess now I can finally share this project with you. It all started 6 months ago with me choosing the project "Microcontroller based projectile speed measurement". The first thing on the list was designing a frame that woul...
by FighterAce
Tue Jun 11, 2013 5:32 pm
Forum: Pneumatic Cannons
Topic: want to build but plans suck
Replies: 8
Views: 1931

Nice list, I like your style :D The only one I didn't make is the M107. If you're going for a replica straight off the bat, I have to recommend the L96. It has a wide chunky stock you can fit a large air tank into and there is a lot of room in the front for a working magazine feed system. The rifle ...
by FighterAce
Thu Feb 21, 2013 2:07 pm
Forum: Pneumatic Cannons
Topic: Piston design with a built in check valve
Replies: 55
Views: 5318

To answer both of your questions... my mill is actually a hand router. Bosch POF 1200 AE to be precise. I can "mill" stuff only because I've built a special table for it :D I'm currently looking into replacing the paper cones with shrink tubing. However with the ever restricting gun laws in this cou...
by FighterAce
Thu Feb 21, 2013 5:45 am
Forum: Pneumatic Cannons
Topic: Piston design with a built in check valve
Replies: 55
Views: 5318

Thanks JSR :D

I didn't post it here because its still incomplete.
by FighterAce
Thu Oct 25, 2012 11:15 am
Forum: Pneumatic Cannons
Topic: bolt action air gun
Replies: 19
Views: 2415

If you open the breech with your left hand and insert the projectile in the barrel with your right hand, whats holding the gun? :D

You also want to limit the bolt travel. In your design, if you let go of the bolt in the unlocked position, the barrel will fall out.
by FighterAce
Tue Oct 16, 2012 6:58 pm
Forum: Pneumatic Cannons
Topic: My gun needs to be lighter Need material info
Replies: 42
Views: 3020

I think what you need is a more efficient launcher. Using a better valve and higher pressure will allow you to decrease chamber size while maintaining decent power. The majority of the weight of my launchers was, until now, in the barrel. What is your primary ammunition? Perhaps an aluminum barrel w...
by FighterAce
Tue Aug 14, 2012 1:00 pm
Forum: Pneumatic Cannons
Topic: Where to get 5/8'' fittings
Replies: 14
Views: 691

AircannonSweden wrote:I think 5/8 and 3/8 is the same thread....
5 / 8 = .625
3 / 8 = .375

.625 ≠ .375

Capish?
by FighterAce
Mon Aug 06, 2012 7:07 pm
Forum: Pneumatic Cannons
Topic: QEV problem. Ball valve broke off inside it
Replies: 13
Views: 1639

So what kind of tools do you have if you can't afford a 5$ extractor? Its a must have anyways. If I were you and didn't have the extractor set I'd use my dremel cut off disc to make some slots in the broken off piece, jam a piece of metal in the slots and rotate it. If that does't work you might as ...
by FighterAce
Fri Jul 06, 2012 7:10 pm
Forum: Ammo & Parts
Topic: Woodworking tools
Replies: 7
Views: 1304

How about buying wood and start making chips :D Its the fastest way to gaining experience and realizing what tools you really need. Apart from what you already have I would definitely invest in a decent router with some attachments. It can serve as a jigsaw, drill press and it leaves a good finish s...
by FighterAce
Sun Jul 01, 2012 6:43 am
Forum: Pneumatic Cannons
Topic: Looking for a hammer type mechanism
Replies: 13
Views: 1824

why not just open it with the rod movement no spring no need to a respect bar. I already answered you... I forgot to mention its supposed to be a spring driven mech... thats why I'm having trouble with it. A direct link between the trigger and some lever would be a lot simpler but I'm going for con...
by FighterAce
Sun Jul 01, 2012 4:35 am
Forum: Pneumatic Cannons
Topic: Looking for a hammer type mechanism
Replies: 13
Views: 1824

I didn't even think of that... no I'm not trying to go semi. This is what I managed to come up with... http://img84.imageshack.us/img84/5420/des1.png Pivot points are red and the reset bar is yellow. Its still got a major problem of high leverage ratio which means I need a strong spring and the trig...
by FighterAce
Sat Jun 30, 2012 7:21 pm
Forum: Pneumatic Cannons
Topic: Looking for a hammer type mechanism
Replies: 13
Views: 1824

Yes but the problem is when you press the trigger, unable to reset sear, not enough mass to open the valve, if spring was strong enough you would just get 1 big hiss of air, Well... the sear could be reset with a spring and the whole mechanism with a reset rod mounted somewhere on the lever. Mass i...