Monday, October 22, 2007

Lax postera...

... is faux-Latin for "I ain't writin'". I've been horribly busy, alternating with semi-futile attempts at recovery via relaxation.

In actual *gun* news though, there's a new arrival; I picked up a pristine H&R 929 a few days ago.

The Chrony F1 arrived as well, and then I realized I forgot to get a light kit for it. Whoops.

To close out this meager post, sitting in the truck waiting for tonight's shooting are 12 .38 special rounds, loaded each with a 148gr HBWC over 4.0 or so grains of Trail Boss, measured from a custom-made scoop that I got all over-engineery with. It's a modern grey Wolf 9mm case, whcih happens to meter 4 grains of Trail Boss repeatably and accurately (or as accurately as you can get with a scoop)... I took a 3/16" wooden dowel and drilled a hole in one end slightly diagonally so it'd emerge from the side 1/2" or so up the line, looped some copper wire and stuck the ends through the hole, and lasso'd the 9mm case by the extractor rim. Then I just tightened it down and slathered it with glue... works great. Could have been neater but hey, it works.

That's all I've got, for now...

Thursday, October 04, 2007

Proof of concept.

I had an idea yesterday and just had to try it out

And, I made a youtube video.

Now, it's already been said that the action shown isn't enough to actually clean the brass. I know; I had it turned down just far enough to keep moving the brass around. As said, what's in the video is 5v p-p sine wave at 50hz; I can crank it up to around 11 or 12v p-p before I run out of power at the 12v supply (amp gets cranky, clip protection kicks in and it quits), and I've also got a working range from 0.1hz to somewhere around 2Mhz, though that's pointless :)

For best results, I run around 6-7 volts and manipulate the frequency till there's a resonance event... at that point I've got to watch for a bit to make sure the can doesn't get bounced off the speaker.

I titled this post proof of concept.. that's what it is. Speakers are fragile. As it's set up I could probably run for a few weeks before I burnt a cone out. What I *can* do though, is take the idea and custom make an oscillator and an amplifier that'll push a heavier coil with a steel "striker" bolted to the bottom of a plastic tub... essentially a linear motor. This will probably happen after I make a motor-driven tumbler though, 'cause I already know the issues involved with those.

Possibilities? Three coils per tub could allow me to phase the frequencies for a stirring action. That the action runs off an oscillator/amp set means that not only is it power adjustable, it's frequency adjustable... one could tune it to the resonance of the active mass for wahtever load you've got and use a lot less power for a lot more motion. And if you get really jiggy, run it empty as a big ole' tranducer and get some good bass for your Skynard :D

A fixed freq unit could even just be a coil plugged straight to the mains with a traic for power control... or maybe not even that much. That's be pretty powerful though, I'd hate to run it for a couple hours and find all my brass beaten flat...

Monday, October 01, 2007

So it begins...

I'll soon be entering a meager beginning for ammo manufacturing. What now?

I already have a press; I already have a couple thousand once-fired .38spl brass. I have powder and projectiles to start. What steps are happening right now?

- I just placed an order for a chrony F1.
- I have in my hot little hands instructions for making a vibratory tumbler
- I have an idea for making a batch powder drop machine

And now, once everything's together, I'll be laying the groundwork for logging and satistical batch checking while cranking out moderate 148gr HBWC .38spl loads.

What else will I be looking into shortly?

- what machinery is involved with hydraulically pressure forming brass or aluminum sheet into rimmed cups... aka rimfire brass
- electroplating kits for unusual finishes like polished tin or bronze, as well as the standard nickel and chrome
-electroplating silver, for projectiles and cases.