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ball valve actuation/bs claims some idiot online is making.

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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ball valve actuation/bs claims some idiot online is making.

Unread postAuthor: pyrogeek » Mon Mar 05, 2007 11:22 pm

So this idiot online is make stupid accusations, and among them is that he can actuate a 1/2inch ball valve in under 15 millisecods (1 millisecond = 1/1000 of a secone), and claiming he is using that because it is "higher perfomance" than a modified sprinler valve or QEV. Anyone have damage shots or something to shut this idiot up once and for all?

The guy is also claiming it is much safer to use ABS since it doesn't shatter. The guy is running a pneumatic at over 200PSI, and is using oxygen in his combustion guns. And he keeps complaining on his site that his guns keep breaking.

This is the idiots site
http://www.sentex.net/~mwandel/cannon/air_gun.html

His email address (incase you want it) is
mwandel@sentex.ca
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Unread postAuthor: A-98 » Mon Mar 05, 2007 11:54 pm

well, im not going to get into ABS vs pvc, cause that always turns into a debate. but is correct that abs doesnt shatter, it rips.

the 15 ms part is a bit over the edge, and i think that he needs to check that again.
however, he does have the ballvalve hooked up to a spring, so im not sure bout the opening time for that.

his marble guns look quite nice, tho the chambers are ABS. i think he needs a good barrel sealer.

ill leave the emailing to someone who would be more profficeint at that, and knows more bout spring actuated ball valves.
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Unread postAuthor: frankrede » Mon Mar 05, 2007 11:56 pm

He is a smart but he is also ignorant.
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Unread postAuthor: homedepotpro » Tue Mar 06, 2007 12:17 am

he's canadian what do you expect
jk
it seems to me he's try to make a very cheap and simple gun sound over sophisticated, i mean he electrical taped his pipes together
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Unread postAuthor: frankrede » Tue Mar 06, 2007 12:30 am

he rifled a marble barrel for Christs sakes!
Lol
Homedoptpro pretty much has the idea right on spot
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Unread postAuthor: CS » Tue Mar 06, 2007 12:44 am

Frick!

Safety ratings, and suggestive uses are understandingly placed well below an items capabilities. There is no binding physical reactions that occur when you slap a 'DO NOT USE FOR PRESSURE' label on the side of a pipe. Pipes can hold 200PSI even when they strictly state its not for pressurized uses. The pipe shown on the rifle obviously is capable of retaining the pressure, particularly given its small diameter.

Well since this 'guy' breaches the commonly accepted safety procedures, should we relentlessly deface him with replies of thirteen year olds? Lets pepper his email with 'fork off you gay homo' comments.

Essentially I do not understand your concern, or whatever it is your trying to do. Wouldn't particularly classify it as a 'concern', as you are clutched in deeming this man incompetent, and a 'idiot'.

O man the fun it is to deliver textual based 'lashings' to a unknowing victim!
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Unread postAuthor: A-98 » Tue Mar 06, 2007 12:59 am

that 13 comment better not have been aimed at me...im 14 now :lol:

i never dissed anything he built, just pointed out what i thought
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Unread postAuthor: SpudBlaster15 » Tue Mar 06, 2007 1:50 am

With a high tension spring, it is entirely possible that his valve is opening as quickly as he states. Considering a 1" sprinkler valve opens in roughly half that time, the ball valve may outperform it due to the ball valve's much higher flow coefficient, but only if the ammo is heavy enough to reamain in the barrel for 15ms or longer.

A small diameter ABS chamber such as what he is using will not blow up, and if it did, it would simply tear (as his oxy/propane combustion guns did).

I dont think he is an idiot.
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Unread postAuthor: skinner » Tue Mar 06, 2007 4:56 am

That website has probably been one of the most inspirational sites to people who are new to pneumatics, on another note, the average opening time of a ball valve by hand is roughly 20-50 ms, if you do it quick enough, and if its actuated by a spring, then the times are closer to about 5-20 ms, so, therefore its quite possible to get an opening time as he stated.

--skinner
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Unread postAuthor: Insomniac » Tue Mar 06, 2007 5:12 am

I highly doubt you could get a ballvalve opened in 5-10ms by hand. I think you are confusing milliseconds with hundreths of a second.
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Unread postAuthor: Hotwired » Tue Mar 06, 2007 6:15 am

Hes got a decent safety procedure for his combustions anyway (hide behind a table wearing a helmet with remote ignition) :D

I'd disagree with a sprung ballvalve being better than a QEV of about the same size though. Its nothing important though.
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Unread postAuthor: mark.f » Tue Mar 06, 2007 6:30 am

Well, there's a radical equation for how much power a spring will release for the material, length stretched/compressed, and how fast it will contract/expand, if anybody feels like some good math this morning. I just feel like going back to sleep, though.
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Unread postAuthor: joannaardway » Tue Mar 06, 2007 8:34 am

I reckon that a good spring loaded ball valve can get down near those times, but it still wouldn't come close to a QEV. It might give an unmodded sprinkler a run for it's money.

I do however like some of the construction on the second cannon on that page. Wouldn't build it like that, but I like the trigger and "cocking lever"
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Unread postAuthor: drac » Tue Mar 06, 2007 9:35 am

Thanks to everyone who read it thouroughly to understand that he used a spring loading system.

Before you go making wild accusations that he's lying, at least have some sort of proof of it, and be sure that you know what you're talking about so you don't look like an ass.
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Unread postAuthor: COD_FILLETS » Tue Mar 06, 2007 3:09 pm

drac wrote:Thanks to everyone who read it thouroughly to understand that he used a spring loading system.

Before you go making wild accusations that he's lying, at least have some sort of proof of it, and be sure that you know what you're talking about so you don't look like an ass.


Heh, I was wondering what pyrogeek was talking about, using a spring, it does seem plausible that a valve would open in that amount of time (given the spring is strong enough, the leverage on the "crank" of the ball valve and the friction the valve has).

I'd guess that since he taped the valve onto his ABS chamber, he probably thinks that the valve would fly off before the chamber exploded/ripped/whatever.
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