I'm using a presta in mine at 240psi and I'm likely to be using it at 300psi too when I get hold of the right kind of pump.jackssmirkingrevenge wrote:ThanksNice work, looks good. Have you considered using a presta valve instead of a schrader? You don't need a pin to depress a presta stem.very logical suggestion... though can a presta handle the sort of pressures I'm likely to subject it to?
... nonetheless, it was accurate and looked EXACTLY like a regular pen (the internals of the pen were the ramrod!), and my english class never knew what hit them (well I guess they did after a while...)
This thing must be so much fun to play with. I wish I could build a mini this small! Keep it up man...
The parts are available from any hobby shop, and I didn't use any complicated tools - mostly a hacksaw, sandpaper, and an electric drill clamped in a vice as an improvised latheYou've inspired me! Now I have no choice but to make one. Thanks a lot...
Thats mostly a risk from handling the pellets, I always wash my hands afterHope you don't get lead poisoning from having lead pellets all over your house.
Besides, the impact energies aren't sufficient to give off too much dust.Good to know, though I think I'll stay with the schrader for this one, don't feel like hacking it up. This is the pump I have:I'm using a presta in mine at 240psi and I'm likely to be using it at 300psi too when I get hold of the right kind of pump.
What are you using to get 400psi?
Don't try making a check valve out of lighter bits thenI can't BELIEVE you were able to fiddle around with such small parts! I get annoyed having to fix my 1" porting piston valves
At 200 psi, it won't make it through a top of a pizza box. However, for such a small chamber, short barrel and tiny projectile, I wasn't expecting much better. Still waiting for the courage to take it to 400 psi again though heheWill it shoot through cardboard? plastic? kevlar?
hectmarr wrote:You have to make many weapons, because this field is long and short life
I know, I know, I'm almost ashamed, after all I routinely hit 1,000 fps with my 6mm coaxials. Now that I have the contest entry covered though I might be tempted to test it to destruction, as far as high pressure goes this is by far the easiest chamber to pump I've ever madeInsomniac wrote:Lol I think its hilarious that we are complimenting a gun that wont shoot through cardboard at 200psi
hectmarr wrote:You have to make many weapons, because this field is long and short life
My only question is how is the guts held in?
Not just in the movies, the KGB have a pen gun that comes complete with a silencer for covert work... Also, Georgi Markov was assasinated using a similar compressed air device hidden in an umbrella that fired a 2mm pellet laced with poison.I like it, kinda has that James Bond\Q look!
My only question is how are the guts held in?
I normally use proper high-strength marine epoxy like this stuff in my projects but given the scale of this particular build, Araldite was enough - plus it takes much less time to cure meaning less anxious jumping around before I can test it ThanksNice, job, you make something complicated and make ist so simple.
now, for me to do a less than mini coaxial, with1" chamber and .177 barrel.
My suggestion if building on a small scale is make an overengineered small chamber and get yourself a high pressure pump, it's the only way to get good performance with small calibers.hectmarr wrote:You have to make many weapons, because this field is long and short life
