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One More Pen Gun

Posted: Fri Jul 23, 2010 12:38 pm
by clemsonguy1125
After seeing the multitude of pen guns posted in the last few weeks I decided to try building one. Right now all testing is done at 80-100PSI until I get my shock pump, then Ill up the pressure. The video below is a 80 PSI shot with a small nail at a Pepsi can.
[youtube][/youtube]
Chamber-7.14mm Brakeline
Fill-Schrader
Pilot-Schrader
Piston-a piece of a rubber spongebob key chain
Power-Shot a toothpick across the room at 150 PSI

Posted: Fri Jul 23, 2010 12:47 pm
by Gun Freak
Looks good but I would've liked to see the piston before it went in. Awaiting damage...

Posted: Fri Jul 23, 2010 12:49 pm
by clemsonguy1125
Its similair to JSRs. just a piece of rubber punched out with a piece of the chamber, ill test it later, if it doesnt work, ill toss it into my bucket of failed minis

Posted: Fri Jul 23, 2010 12:50 pm
by Gun Freak
Did you get a threaded schrader or is it a normal one just epoxied in?

Posted: Fri Jul 23, 2010 12:52 pm
by clemsonguy1125
I bought a normal one, put it i my drill and held a file to it until all the rubber had be shaved off, than roughed it up a little so the epoxy would bond to it

Posted: Fri Jul 23, 2010 12:53 pm
by Gun Freak
Ok cool, how long has the epoxy been drying, and when you gonna shoot it?

1500 posts!!!!!!!!!!!!!!!! :D :D :D :D :D

Posted: Fri Jul 23, 2010 12:54 pm
by clemsonguy1125
Later today, its supposed to cure for 30 minutes but im given it 3 hrs to be safe

Edit-Tested it, Shot a tooth pick Wrapped in tape across the room, Im having issues filling it and disconnection it from the pump without piloting it

Posted: Fri Jul 23, 2010 2:31 pm
by SpudBlaster15
clemsonguy1125 wrote:Im having issues filling it and disconnection it from the pump without piloting it
You should be able to position the pump head such that the schrader valve closes immediately after the clamping lever is opened, preventing gas loss from the pilot chamber. I had a similar problem with my first pneumatic, until I figured out how to connect the pump properly.
Gun Freak wrote:1500 posts!!!!!!!!!!!!!!!! :D :D :D :D :D
I'd think about slowing down if I were you. In 6 months, you've moved up to 33rd on the all time posts list, surpassing many people who have been here several times longer; and your rate of 8.4 posts/day is 2nd only to JSR, and dwarfs the rate of most regular members by a factor of 3 or 4.

Not trying to harp on you, just some friendly advice. The forum isn't really designed for social chatting, and making fewer, more well thought out posts would do a lot more for your reputation around here.

Sorry for going off-topic Clemson, now back to your regularly scheduled programming.

Posted: Fri Jul 23, 2010 2:39 pm
by clemsonguy1125
No problem spud blaster, thanks for the tip, BTW I added a picture of the gun with its grip, and eraser cap

Posted: Fri Jul 23, 2010 5:35 pm
by jackssmirkingrevenge
clemsonguy1125 wrote:i'll test it later, if it doesnt work, ill toss it into my bucket of failed minis
Milton wrote:Long is the way, and hard, that out of hell leads up to light
:roll:

Good job on making it work.

As to removing the fill valve without piloting,this cheap shock pump design (the ones with the purple knob must... resist... temptation... for innuendo! gah! that allows you to independently depress the stem)

Posted: Fri Jul 23, 2010 5:41 pm
by clemsonguy1125
Thanks, Im planning on ordering one later this week, whats some good amo youve found, little nails work well but I cant find anything else, the barrels 5/32 brass

Posted: Fri Jul 23, 2010 5:48 pm
by jackssmirkingrevenge
Either nails wrapped in tape, or at higher pressures steel ball bearings of the appropriate diameter.

Posted: Fri Jul 23, 2010 5:50 pm
by clemsonguy1125
Ok, i guess for now im stuck with nails, once I get the shocky Ill see what it can do at 300 PSI, thats the max I feel safe with this gun
Edit-Adding Video Now
Edit 2-Video is up

Posted: Fri Jul 23, 2010 6:33 pm
by Gun Freak
I like the background music in the video :P
Pretty nice, I want to see how it holds up at higher pressure.

Posted: Fri Jul 23, 2010 6:34 pm
by jor2daje
Looks very nice clemonsguy, how did you end up spacing the barrel from the chamber?

And I completely agree spudblaster, people who make a few well thought out and helpful posts earn a lot more respect in my book.