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ggdt run-time error 5

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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ggdt run-time error 5

Unread postAuthor: Crna Legija » Sat Apr 10, 2010 8:46 am

i got ggdt to open on vista thanks to the other posts and now get a run-time error 5 90% of the time i use it i have vista home and ggdt v4.6
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Unread postAuthor: Ragnarok » Sat Apr 10, 2010 8:49 am

This is likely caused by the fact you've given the barrel diameter as 100cm.
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Unread postAuthor: Crna Legija » Sat Apr 10, 2010 8:52 am

just changed it and still happend

edit: i changed it from cm to inch and it works
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Last edited by Crna Legija on Sat Apr 10, 2010 8:58 am, edited 1 time in total.
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Unread postAuthor: Ragnarok » Sat Apr 10, 2010 8:55 am

Possibly the fact the piston seat diameter and piston diameter are so close together.

You do know what each of those means, right?

EDIT: Alternatively, that pilot volume is very low, but GGDT has a feature that'll cover that.
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Unread postAuthor: qwerty » Sat Apr 10, 2010 9:02 am

I had something abit like that, does it just close the window down?
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Unread postAuthor: Crna Legija » Sat Apr 10, 2010 9:07 am

i drill press lathed my piston with a oring and put a moded schrader valve in it as a check valve.
and my pilot is full of hot glue it follows the d/4 rule

all the number in my ggdt screen shot are measured with digital calipers

yeah when i click ok it close

edit i downloaded it again and it works but only in inchs
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Unread postAuthor: Ragnarok » Sat Apr 10, 2010 9:14 am

-_- wrote:all the number in my ggdt screen shot are measured with digital calipers

So the diameter of the valve orifice (i.e. the hole the air flows through to get to the barrel) on your cannon is 19.7mm? With a 20mm diameter piston? Well, I can tell you right off, in the real world, that cannon wouldn't work.

What I think you've done is put the diameter of the piston in the seat diameter, and put the diameter of the tube it sits in under "piston diameter".

While the latter is acceptable, the former is a mistake - and if you've not made a mistake with the numbers you've put in, you need to fix that cannon.
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Unread postAuthor: Crna Legija » Sat Apr 10, 2010 9:50 am

no its 1.97cm is where the piston seals aganst and the piston is 2cm wide and i put a grove in the piston so that air can push it back since there isent much around the barrel port
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Unread postAuthor: Ragnarok » Sat Apr 10, 2010 10:05 am

Um... yeah, that just isn't going to work.

That groove - it does nothing. Air pressure acts in all directions. It will push on the back of your groove - but it will also push on the front of the groove completely equally.

Want a demonstration? Put the piston down on a table - it is now in a isobaric system like the chamber (namely, the atmosphere). Is it experiencing any acceleration as a result of unequal forces on that groove?

It isn't? Bummer. Well, it isn't going to experience any in the chamber either.

The problem here isn't with GGDT, the problem is with your launcher.
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Unread postAuthor: qwerty » Sat Apr 10, 2010 10:07 am

I had the same thing happen to me you just have to load it up a few times.
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Unread postAuthor: Crna Legija » Sat Apr 10, 2010 10:20 am

i know my gun works
i just downloaded it and it works now only in inchs
thanks for that rag i thought it would help, makes it lighter now
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Unread postAuthor: Ragnarok » Sat Apr 10, 2010 10:28 am

-_- wrote:i know my gun works

Well, if the launcher works, then you're clearly putting the wrong numbers into GGDT. If those numbers were genuinely the right ones, I have absolutely no doubt the launcher would completely fail to work.
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Unread postAuthor: Crna Legija » Sat Apr 10, 2010 10:38 am

my sealing face is a bit bigger than my piston(about 1mm on each side) that i did not acount for so your right

but still if i set my gun up in inches it work then set it to cm and i get run time error

ill try see if a bigger piston fixes it
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