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"In the world of spuds today"

A place to ask general spud cannon related questions.
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Unread postAuthor: Labtecpower » Tue Jul 10, 2012 2:18 pm

Nice... centre of gravity? looks like the walls could have been a bit thinner...


somewhere around the end of the hole.. The walls could certainly have been thinner, but I did this to make them reusable, not working when i'm shattering them against bricks, or burying them under the lawn :roll:

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"ñøw mÿ šįg šüçkś!"
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Unread postAuthor: Fnord » Fri Jul 20, 2012 8:23 pm

New foundry built today, and a torch to go with it.

Capacity will probably be about 200 cubic inches with a steel crucible, about 1/3 that with my graphite one.

I threw five pounds of steel in it and got it glowing orange in 3-4 minutes. It's mainly for bulk aluminum, but I might try using it to cast steel in the far future.

Short test video.
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Unread postAuthor: MrCrowley » Fri Jul 20, 2012 8:25 pm

Link doesn't work :(

What will you be casting parts for? A hybrid I hope.
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Unread postAuthor: Fnord » Fri Jul 20, 2012 8:33 pm

Works now... wasn't done converting apparently. Vimeo chewed the compression up a bit :(

I'd actually like to get a lathe underway; much more useful in the long run. If I can get it to melt steel I might use it for a high-pressure fittings I'd otherwise have to order online. And I'd never have to buy thick stock material again.
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Unread postAuthor: MrCrowley » Fri Jul 20, 2012 8:44 pm

Could always cast parts to make your own motorbike :D

Thought about using casting to make your QDV hybrid idea? Now that I think about it, casting does open up a lot of possibilities for piston valve design and manufacturing custom fittings to improve hybrid design.
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Unread postAuthor: Fnord » Fri Jul 20, 2012 8:59 pm

Thought about using casting to make your QDV hybrid idea?


That's a possibility, though the paint bucket foundry had enough capacity for the bulkiest part in that design(piston). For testing purposes I'll probably make some ash trays for the guys at work, since a couple of them asked me why I rolled a big chunk of galvanized steel yesterday :).

Oh yeah, and I may use this as a forge in the future.
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Unread postAuthor: ramses » Mon Jul 23, 2012 9:52 pm

Does that use waste oil or straight propane?
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Unread postAuthor: Zeus » Mon Jul 23, 2012 9:56 pm

Nice work, looks like propane to me?
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/sarcasm, /hyperbole
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Unread postAuthor: Fnord » Tue Jul 24, 2012 7:18 pm

It's just propane. You can probably see there's no second inlet on the torch. (typically you need forced air with a waste oil torch).

I cranked up the heat a little sunday night and scrapped some copper I had laying around... here's a crappy video still of the crucible coming out.
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There was somebody else there with me but the camera was on the tripod the whole time.
The rest of the video is just me complaining about stuff and talking about all the horrible things that can go wrong when you're playing with hot metal.
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Unread postAuthor: Zeus » Tue Jul 24, 2012 8:04 pm

Fnord, by horrible things that can go wrong while you're playing with hot metal, does that include dropping the full crucible while you're wearing shorts?
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Unread postAuthor: Fnord » Tue Jul 24, 2012 8:14 pm

Hey! :evil:

Shoes.
Shirt.
Safety glasses

...AND pants. (Shorts are basically pants)

That's a lot better than I usually do.

No gloves, socks or underwear though.
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Unread postAuthor: jackssmirkingrevenge » Wed Jul 25, 2012 12:15 am

"Mummy, why does uncle Fnord not have children we can play with?"

"Well dear... you see, "Commando" is not just a Schwarzenegger movie..."
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Unread postAuthor: mark.f » Thu Aug 02, 2012 6:54 pm

itwost, I got my hands on a working A/C compressor. All I need is a single compression fitting and air filter and I can say goodbye to 10 minute pumping sessions.
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WIP: belligerent mixture of steel and pressurized reactants
COMPLETION: several months out
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Unread postAuthor: MrCrowley » Fri Aug 03, 2012 4:56 am

This is what I did today. Not exactly helpful for most of us but might be a useful example for newbies. The main reason I filmed it was just so I had some hard numbers for these two cannons (my only 'large' bore pneumatics).

[youtube]http://www.youtube.com/watch?v=M10TfcEXVs0[/youtube]
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Unread postAuthor: mattyzip77 » Fri Aug 03, 2012 11:41 am

you always make the best videos!! Where did you get that chronny and how much was it?? That sprinkler valve is a monster!!
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