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Trident Mk. II Build Log

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 » Tue Aug 02, 2011 12:27 pm

Yeah yeah, I'm cycling it from the sun to the shade. With this weather, a solar oven is starting to look like a good idea...
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Unread postAuthor: irisher » Tue Aug 02, 2011 12:48 pm

If you get into large epoxy casts you will also have to deal with the heat put off by the epoxy curing, I have had marine epoxy burn away the mold and ruin everything.
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Unread postAuthor: saefroch » Tue Aug 02, 2011 3:47 pm

How big was the object you were trying to cast?
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Unread postAuthor: irisher » Tue Aug 02, 2011 4:32 pm

3.25" piston message too short
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Unread postAuthor: saefroch » Sun May 20, 2012 3:33 pm

Build log, I revive you!

Back home for the summer, parts have been ordered. I found an old NPT spark plug on ebay and ordered adapters to attach it to the chamber. Parts will arrive by June 3<sup>rd</sup> at latest.

I'm also going to scrap the current piston in favor of an Fnord-based design, which I hope will be posted soon. There may be issues with o-ring blowoff, which seems to be the only drawback.

Just a quick question, if anyone knows: Do I require a TiN-coated bit to drill through SS, or will one of these cut it? :roll:
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Unread postAuthor: Labtecpower » Sun May 20, 2012 3:49 pm

You can drill into SS with a standard HSS bit, just lower the cutting speed in order to keep your drill cool enough. Using cutting fluid is also a good idea.
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Unread postAuthor: Crna Legija » Mon May 21, 2012 2:07 am

yeah HSS is fine some Trefolex makes it heaps easier.
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Unread postAuthor: Zeus » Mon May 21, 2012 4:58 am

But spending the extra $40 and buying a set of cobalt bits is so worth it. I wouldn't buy HSS bits again unless I was flat broke.

I don't have a set of cobalt bits, just a couple, and when I'm not broke, I'll buy a full metric set.

And good to see you back Saefroch.
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Unread postAuthor: saefroch » Mon May 21, 2012 8:33 am

I have a set of standard english sized TiN coated bits, the one I'm buying might be a one-time use, being such an exotic size.

Thanks for the welcome back!
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Unread postAuthor: saefroch » Mon Nov 26, 2012 10:18 am

Update!

Now at college, with access to a machine shop. I've worked out and got parts for a fueling rig and a pressurized pilot system. Now I'm just having an inner debate... For the end of the piston that has a diameter just slightly less than 0.5... Do I machine my own seal or stretch an undersized o-ring?
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Unread postAuthor: saefroch » Wed Nov 28, 2012 4:31 pm

Day 1 of machining done, pump cylinder reamed to 3/8", and pump rod almost to exact size (~0.002" left on it).

Tomorrow should see a finished small high-pressure pump.
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Unread postAuthor: saefroch » Thu Nov 29, 2012 11:47 pm

Day 2 of machining, good progress. New pump completed, 3/8" diameter head, 12" stroke:

Image

Sorry for the terrible picture quality, all I have at school is my cell phone. The weld is not mine.

I've also discovered that if I ask nicely, the school will pay for my raw materials. The machinist here is ordering a piece of steel for me to machine a new valve body. No epoxy this time.
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