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Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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Unread postAuthor: saefroch » Sat Jul 23, 2011 4:42 pm

Yeah. I'm going to see if I can grab some 1/4" ID tubing from Radio Shack later. I tried to use the 1/2" that I used for the valve body...

But so far it seems that the other parts I made are just fine. :)

saefroch wrote:It didn't seal, is it possible that is entirely due to the crooked nature of the o-ring?
*ahem*
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Unread postAuthor: saefroch » Sat Jul 23, 2011 9:03 pm

Image It seals.
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Unread postAuthor: Gun Freak » Sat Jul 23, 2011 9:04 pm

Everybody seems to be neglecting you :lol:

That looks great! Drill press + file?
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Unread postAuthor: saefroch » Sat Jul 23, 2011 9:40 pm

I must agree, of all the pieces I've made on a drill press, I think I like this one the most.

File, hacksaw blade, and sandpaper.
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Unread postAuthor: Gun Freak » Sat Jul 23, 2011 9:41 pm

Man I need to pick me up a drill press 8)
It looks a bit short compared to the last one, although it is hard to tell because you didn't put anything for scale.
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Unread postAuthor: saefroch » Sat Jul 23, 2011 9:57 pm

I just use a good friend's drill press. It's probably a lot slower to make something on a drill press than on a lathe, but the end products can be rather similar.

The grain size on the wood is about the same :P It's shorter than my epoxy attempt, but the section with a greater diameter is ~.25"
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Last edited by saefroch on Sat Jul 23, 2011 10:35 pm, edited 1 time in total.
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Unread postAuthor: Gun Freak » Sat Jul 23, 2011 10:00 pm

Oh... a lot smaller than I thought! :? Should put a quarter or something by it next time... if you have that kinda cash layin' around :D My next door neighbor has a drill press but I wouldn't wanna bother him to let me use it.
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Unread postAuthor: saefroch » Sun Jul 24, 2011 2:38 pm

Became frustrated with epoxy spark plugs, and discovered that 16mm spark plug is only $2.11 with tax. Purchased, ground, first stage of epoxying is curing as I type. I put a thin layer over the outside, then I'm going to heat and pour some inside the fitting (and hopefully into the threads) for better integrity under pressure.

I think I'm in the market for a non-piezo ignition system. Ideas? I have a camera flash circuit setup, but I haven't been able to make it arc...
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Unread postAuthor: Crna Legija » Mon Jul 25, 2011 1:25 am

saefroch wrote:Became frustrated with epoxy spark plugs, and discovered that 16mm spark plug is only $2.11 with tax. Purchased, ground, first stage of epoxying is curing as I type. I put a thin layer over the outside, then I'm going to heat and pour some inside the fitting (and hopefully into the threads) for better integrity under pressure.

I think I'm in the market for a non-piezo ignition system. Ideas? I have a camera flash circuit setup, but I haven't been able to make it arc...


if you go to a bike parts store, and get a cr10ek spark plug they have 1/8'' npt threads
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Unread postAuthor: saefroch » Mon Jul 25, 2011 7:55 am

Hmph. Every guy I talked to said they only knew of metric-sized spark plugs.
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Unread postAuthor: dewey-1 » Mon Jul 25, 2011 11:12 am

CR10EK plugs are 10 mm not 1/8 NPT.
So do not call them 1/8 NPT.
1/8 NPT is 27 tpl threads per inch. 1/27 = .037037 inches
10mm x 1mm pitch. 1mm = .0393701 inches.

They are close but not the same. Difference of .002333 inches.
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Unread postAuthor: POLAND_SPUD » Mon Jul 25, 2011 11:28 am

technically they are not 1/8" NPT but they are pretty damn close

I threaded mine into 1/8" BSP, which is even smaller than NPT

I threaded it in out out a few times and voila... I managed to thread them all the way
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Unread postAuthor: saefroch » Mon Jul 25, 2011 11:35 am

Well that little tidbit would have helped a lot... it doesn't do any good to ask for a NPT sized spark plug when what you actually want is a 10mm one...
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Unread postAuthor: mattyzip77 » Mon Jul 25, 2011 12:52 pm

Gun freak, just make a jig and your own drill press. It would be easy for you to do, seeings how you make everything else look so freakin easy!!! :D
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Unread postAuthor: saefroch » Wed Jul 27, 2011 9:57 am

Camera flash circuit works again, but with the switch connected, the flash was almost deafening. Testing switch then transformer. Watch this space...

Switch does not work. :( Searching for a BBQ igniter...
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Last edited by saefroch on Wed Jul 27, 2011 11:06 am, edited 1 time in total.
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