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Potato cannon carriage #4: Ignition

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Blog entry by JJohnston posted 08-10-2010 05:21 AM 4116 reads 0 times favorited 9 comments Add to Favorites Watch
« Part 3: Trail, ramrod and major assembly Part 4 of Potato cannon carriage series Part 5: Forward armor »

Ignition is via a 100,000 volt stun gun connected to the electrodes. The stun gun has a sliding on/off switch on the left side, and a momentary contact rocker switch on the right. I carefully pried the rocker switch body out of the housing and disconnected the wires. I then removed the guts from the switch housing, cut out a small rectangle of acrylic the same size as the bezel on the switch housing, drilled a hole in it big enough for the lamp wire I’m using for a remote switch, and super glued it to the switch housing. I tied both pieces of the lamp wire in a knot, down close to the ends, and soldered them to the switch wires. I then pulled the lamp wires back out until the knot was inside the switch housing, and snapped the housing back into the stun gun.

On the other end of the lamp wires, about 8’ long, I made up a pushbutton handle like a game show buzzer with some 3/4” PVC, 2 caps, and a pushbutton switch (again from McMaster-Carr).

I used butt connectors to crimp pieces of 10 gage wire to the stun gun terminals, and ran the wires to the electrodes. The stun gun is held to the cannon with a hose clamp. The connections are covered in a thick coating of liquid electrical tape.

Here’s a shot of the arc. You can really hear it crackling inside the tube; it amplifies the sound like a drum. As of this moment, the gun is now, technically “shootable”, but there’s still more to do.

Next installment: forward armor plating.

-- "Sometimes even now, when I'm feeling lonely and beat, I drift back in time, and I find my feet...Down on Main Street." - Bob Seger



9 comments so far

View FirehouseWoodworking's profile

FirehouseWoodworking

629 posts in 1960 days


#1 posted 08-10-2010 05:41 AM

I’m liking it! Anything involving a stun gun can’t be all bad!

I’m thinking I HAVE to get me one of these!

-- Dave; Lansing, Kansas

View Kindlingmaker's profile

Kindlingmaker

2654 posts in 2213 days


#2 posted 08-10-2010 06:55 AM

I got this smile from ear to ear! I too have got to make one of these!

-- Never board, always knotty, lots of growth rings

View RonPeters's profile

RonPeters

708 posts in 1567 days


#3 posted 08-10-2010 06:55 AM

You put hardware cloth at the exit and you can make French fries!

Can’t wait for the video!

-- “Once more unto the breach, dear friends...” Henry V - Act III, Scene I

View Dennisgrosen's profile

Dennisgrosen

10850 posts in 1802 days


#4 posted 08-10-2010 08:30 AM

Damm a stun gun as a firing igniter , clever idea, but not possiple here in Denmark
its catagorized as a weapon and not allowed :-(
have to figur out what ells can be done

Dennis

View JJohnston's profile

JJohnston

1586 posts in 1978 days


#5 posted 08-10-2010 02:06 PM

Dennis, you can use an ingition coil from an older car with the “points” style ingition. In fact, the guy whose website you linked to in my last entry shows how.

You can also use a piezoelectric barbecue sparker, or even the most primitive, a flint and steel camp lantern sparker. I use one of these on my little handheld cannon, and apart from a little leakage, it works fine, but you can’t trigger it remotely.

-- "Sometimes even now, when I'm feeling lonely and beat, I drift back in time, and I find my feet...Down on Main Street." - Bob Seger

View jockmike2's profile

jockmike2

10635 posts in 2933 days


#6 posted 08-10-2010 04:54 PM

You have a bit of McGyver and James Bond in you. LOL. And a bit of the devil. But I love it. Can’t wait to see it in action.

-- (You just have to please the man in the Mirror) Mike from Michigan -

View Dennisgrosen's profile

Dennisgrosen

10850 posts in 1802 days


#7 posted 08-10-2010 06:30 PM

thank´s Jonston
the piezoelektric igniter why havn´t I thought of that
I have ten-twelf of them floating around somewhere :-) they are from one time gaslighters with long beam
they can easely bee converted to this little GiG

View Mark Shymanski's profile

Mark Shymanski

5113 posts in 2399 days


#8 posted 08-13-2010 06:59 AM

Driving outbound on our vacation Jenn could not understand why anyone would want to build a potato gun… is this a female/male thing…how could anyone NOT want to build one? We spent many kilometres discussing the pros and cons of potato guns and the mindset that goes into building one. I don’t think I convinced her that this is something that needs to be added to the ‘to do’ list :-)

-- "Checking for square? What madness is this! The cabinet is square because I will it to be so!" Jeremy Greiner LJ Topic#20953 2011 Feb 2

View JJohnston's profile

JJohnston

1586 posts in 1978 days


#9 posted 08-13-2010 02:13 PM

Just borrow that old Harley rider’s slogan: if you have to ask, you wouldn’t understand.

-- "Sometimes even now, when I'm feeling lonely and beat, I drift back in time, and I find my feet...Down on Main Street." - Bob Seger

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