Gun Freak wrote: I too wonder what has happened to JSR... Maybe the RCMP got the best of him.

Let's hope not! We've already had one member have a brush with them!

This forum theme is awful though. What is this, a windows 7 troubleshooting forum? Wouldn't be surprised if this has discouraged some visitors from reading into the content and registering. With criticism should comes constructive suggestions if you want anything changed/different... jussssssss say...

It might be dead to us SB15 - but it's still alive - it seems to be mostly regurgitated designs of low power pneubmatics on instructables or 'take-your-pick' YouTube instructional videos. The way people get their information is rapidly changing... when we were kids - internet forums were more common...

If you do go with Poland's recommendation of a PIR sensor - I highly recommend using these PIR sensors! http://www.amazon.com/2013newestseller-HC-SR501-Pyroelectric-Infrared-Detector/dp/B00FDPO9B8 I've used about 20 of them on projects where I work, and they are super reliable with a 5V input. They ...

^^^^^ If only it worked that easily... Try using a single channel relay board like this: http://www.amazon.com/Docooler%C2%AE-Active-Channel-Module-Arduino/dp/B00G9TQH8U I've gotten them to reliably trigger off of a 3v logic line - there's a chance 1.8v will work - it's only got to activate the opto...

Use soft 1/4" or 3/8" copper tubing and wrap it as tightly around the pump body as you can - run a recirculating water loop through this coil! The copper will allow the best heat xfer rate of affordable materials, and if you are able to either get a dense coil, or for a less dense coil, as you wrap ...

The main difference you'll find with modern paintball guns and your creations - obviously beyond the electro-pneumatic assemblies that make them spit out 30 balls per second - is the tiny o-rings, and the excessive fussy-ness with the amount of pneumatic grease you apply to said o-rings haha. Other ...

It might be a chicken/egg scenario - but my gut feeling is that the Antenna Launching folk came up with the valve's spud gun usage first. It's certainly not a novel idea with origins in spudding, but it was a major game changer with regards to spudding's power output and effectiveness! For some reas...

Yes please do that instead of excesseive reducers (and possible failures due to all the glue joints!!) Just make sure you drill through at a spot where a coupler is overlapped with the pipe underneath - i.e. a glue joint on a union/reducer. Try and put the hole halfway on the overlap if you can. Mak...

Do yourself a favor and don't use a Schrader valve if your chamber is 6" x 10' !!! At the very least, try and use a 1/4" NPT quick discconnect in combination with a ball valve to seal the chamber. Then just directly connect your air compressor (which I hope to steezus krist you have - given your cha...

Just briefly looking over your concept (So what I'm about to say may have already been considered and may be completely bunk given your scenario) - have you considered using a variation of the ZVS (Zero Voltage Switching) Style drivers used for flyback coils? They work in a semi similar manner where...

The design certainly has it's benefits - one of the most notable will be consistency. A professor was leading a project for Engineering seniors in my school - and I asked them why they picked a similar design for testing - repeatability was their claim. They were designing a kinetic energy delivery ...

Similar to Sudpuzzer's request - what printer, firmware (version) and slicer program are you using? Like what sudpuzzer was saying - make sure your drive mechanisms are tight and true - but not overly tight as that can cause missed steps and completely ruin your print. - there are guides and general...

That is a safe approximation - and makes a lot of sense if you think about the vast inequalities in volumes! That .8 after 6 won't yeild a 100psi shot either - so in reality you're only getting 6 full power shots out of that tank. Not many people use paintball HPA tanks and expect any type of rapid ...

P1V1 = P2V2 will get you the [basic] answers you need! Set up a simple excel (or google spreadsheets, i.e. free) calculation for one instance, then click and drag it down to figure out when you're at the point of no return (i.e. your tank pressure = chamber pressure). Math and Ballistics pretty much...