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da-g-dog
Mad Scientist
USA
231 Posts |
 Posted - Aug 29 2003 : 02:43:05 AM
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I bought a 10 foot piece of black ABS for the Noisy Cricket spud gun. Only after I had it all assembled, did I notice that it was cellular core ABS. When I began to sharpen the end of the barrel, I noticed that it looked kind of sponge-like. Is this the wrong type of ABS to use for a spud gun, or is it ok?
Also, refering to the High Voltage Generator as the ignition source, is there a circuit that I could install after that which would make the spark pulse really fast? By fast I mean, like, times a second. I would like to do this to enhance the burn even more than just a hotter spark. Or is the spark more than enough?
One more thing. How many amps does the generator draw? I have access to a 12 volt 7.5 amp battery. Would this work as the power supply?
hike master kyle
Edited by - da-g-dog on Aug 29 2003 03:50:53 AM |
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cirvin
Nobel Prize Winner
USA
1542 Posts |
Posted - Aug 29 2003 : 09:59:46 AM
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your battery is plenty of power. pulsing the spark doesn't neciscarily make it stronger, but putting a capacitor between th terminals does, you will need a very high voltage cap and a rectifier. here is how to hook it up
flyback--rectifier---|--terminal
cap
flyback----------------|--terminal
next stop: nobel prize winner! |
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Aug 29 2003 : 4:22:40 PM
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The HV generator on my site produces a continuous arc for as long as it has power. Pulsing is unnecesary.
I think you have the wrong pipe. You need SCH-40 ABS.
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da-g-dog
Mad Scientist
USA
231 Posts |
Posted - Aug 29 2003 : 10:05:34 PM
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quote:
The HV generator on my site produces a continuous arc for as long as it has power. Pulsing is unnecesary.
I think you have the wrong pipe. You need SCH-40 ABS.
Ok. No pulse then. The pipe does say SCH-40 on it though. And the sidewalls are roughly 3/16 to 1/4" thick.
hike master kyle |
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cirvin
Nobel Prize Winner
USA
1542 Posts |
Posted - Aug 29 2003 : 11:36:37 PM
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well celualr core abs will probably fail after the first couple of shots. i suggest pvc
next stop: nobel prize winner! |
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the SPECIALIST
Apprentice
Canada
81 Posts |
Posted - Aug 30 2003 : 5:36:11 PM
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i dont think that u should use pvc. i've read that when a pvc cumbustion chamber explodes it send shrapnel everywere however an abs spudgun will crack into 3 or 5 plates
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cirvin
Nobel Prize Winner
USA
1542 Posts |
Posted - Sep 02 2003 : 09:01:10 AM
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i have heard the same for abs. you could wrap chicken wire around it.
next stop: nobel prize winner! |
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Sep 02 2003 : 10:56:23 AM
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If it's SCH-40, then your probably fine. I've never had problems with ABS exploding, even when using an oxygen-propane mixture.
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cirvin
Nobel Prize Winner
USA
1542 Posts |
Posted - Sep 03 2003 : 11:08:13 AM
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how high a temp can abs take?
next stop: nobel prize winner! |
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Sep 04 2003 : 09:42:15 AM
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No idea...100 degrees maybe? The high temps in a spudgun only last for half a second or so, which prevents the pipe from melting. Many shots in a row may warm up the pipe enough to soften it...
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type of ABS/ignition circuit
