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will this hurt my piston ?

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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Unread postAuthor: Gippeto » Sun Aug 28, 2011 8:22 pm

To a mod,

Can we just put all of this guys stupid questions in one thread??

I know it's been tried before...maybe this time it'll work?? Nothing else is. :roll:
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Unread postAuthor: ramses » Sun Aug 28, 2011 8:29 pm

Essentially, the force required to stop your piston is equal to the force acting on your piston as it opens times (1+piston acceleration distance/deceleration distance)

That assumes your chamber puts out a constant pressure the whole time and tends to overestimate the forces involved.
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Unread postAuthor: Zeus » Sun Aug 28, 2011 9:42 pm

Gippeto wrote:To a mod,

Can we just put all of this guys stupid questions in one thread??



Well some would be advocating a posting ban for a few weeks, maybe a month or more. If you can't demand information, you just have to read.

Or go to Instructables of similar.
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/sarcasm, /hyperbole
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Unread postAuthor: Technician1002 » Sun Aug 28, 2011 10:44 pm

Ball park math is not too hard. In reality the forces are not a simple time vs force, but the basics is the following.

The formula F=M times A applies to getting the piston moving and bringing it to a stop.
http://www.racemath.info/forcesandpressure/what_is_f=ma.htmIf you apply 100 lbs of force on a piston for 1 inch of travel the speed is related to it's mass. Stopping the same piston in 1/10th the distance will require a force in the opposite direction 10 times greater or 1,000 pounds into the barely compressable bumper. This short stopping distance without a bumper tends to break things made of plastic.

How far does your piston open. How much force is applied while it is opening? How much distance does it have to slow back down?

The fun in spudding is damage pictures where the acceleration distance is several feet and the deceleration distance is a matter of inches resulting in impacts that punch holes in steel.

One way to limit the energy in a piston is to limit the distance it picks up speed. Limit the total travel to eliminate excess travel.

Edit. Found a better photo. Acceleration zone about 4 feet. deceleration zone about 1/4 inch. Acceleration force about 70 pounds average. deceleration force was much higher. Not sure what the punch through force is for a washing machine.
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Last edited by Technician1002 on Mon Aug 29, 2011 12:34 am, edited 1 time in total.
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Unread postAuthor: mattyzip77 » Sun Aug 28, 2011 11:49 pm

Gippeto wrote:To a mod,

Can we just put all of this guys stupid questions in one thread??

I know it's been tried before...maybe this time it'll work?? Nothing else is. :roll:
he means well gippeto, he just has very little, and or absolutly nocommon sense whatsoever!!! Not bustin your chops either jesse, just stating the apparently obvious!!
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Unread postAuthor: jsefcik » Mon Aug 29, 2011 12:16 am

mattyzip77 wrote:
Gippeto wrote:To a mod,

Can we just put all of this guys stupid questions in one thread??

I know it's been tried before...maybe this time it'll work?? Nothing else is. :roll:
he means well gippeto, he just has very little, and or absolutly nocommon sense whatsoever!!! Not bustin your chops either jesse, just stating the apparently obvious!!



I see how it is lol, but id rather ask questions then to have problems later
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Unread postAuthor: Crna Legija » Mon Aug 29, 2011 1:53 am

jsefcik wrote:
mattyzip77 wrote:
Gippeto wrote:To a mod,

Can we just put all of this guys stupid questions in one thread??

I know it's been tried before...maybe this time it'll work?? Nothing else is. :roll:
he means well gippeto, he just has very little, and or absolutly nocommon sense whatsoever!!! Not bustin your chops either jesse, just stating the apparently obvious!!



I see how it is lol, but id rather ask questions then to have problems later


Well next time you ask a question put all the info you have about the question at hand. Stops us asking you 100 questions before we can answer.

Also do researched before, I and many of us can tell you didn't do any before this one.
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Unread postAuthor: Gippeto » Mon Aug 29, 2011 9:25 am

mattyzip77 wrote: he just has very little, and or absolutly nocommon sense whatsoever!!


REALLY??? :lol:
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Unread postAuthor: velocity3x » Mon Aug 29, 2011 10:11 am

velocity3x wrote:
jsefcik wrote:
velocity3x wrote:
will this hurt my piston ?


Pistons lack a central nervous system, therefore they are not capable of experiencing physical of emotional pain.


I didnt ask for a smarta** answer



Clearly, you didn't like that answer, so might I suggest an IBUPROFEN for your piston and a MIDOL for you?
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Unread postAuthor: Gippeto » Mon Aug 29, 2011 11:13 am

velocity3x wrote:... and a MIDOL for you?


:lol: :lol: :lol: LMAO
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Unread postAuthor: jsefcik » Mon Aug 29, 2011 11:54 am

velocity3x wrote:
velocity3x wrote:
jsefcik wrote:
velocity3x wrote:
will this hurt my piston ?


Pistons lack a central nervous system, therefore they are not capable of experiencing physical of emotional pain.


I didnt ask for a smarta** answer



Clearly, you didn't like that answer, so might I suggest an IBUPROFEN for your piston and a MIDOL for you?



hahahaha, that was hilarious i gotta remember that one!!
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Unread postAuthor: mattyzip77 » Mon Aug 29, 2011 1:36 pm

May I recommend to a MOD that we give jsefcik his very own forum???
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Unread postAuthor: jsefcik » Mon Aug 29, 2011 4:42 pm

mattyzip77 wrote:May I recommend to a MOD that we give jsefcik his very own forum???



hahahahah
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