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My Mal Pistol Project

Props So Nice They Had To Show Them Twice. Or more.

Re: My Mal Pistol Project

Postby drewsmith007 » Sat Nov 16, 2013 5:09 am

Wow, those are some big numbers for shrinkage. Everything I've run across is saying 3-6%. Guess I'll see soon. Thanks for the compliment, it means alot coming from you!
Bwah.
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Re: My Mal Pistol Project

Postby drewsmith007 » Sat Nov 23, 2013 3:52 am

Here's the first casting as it sits in the mold. I'll know in an hour or so if it turned out. Stay tuned!

Image

And yes, that is red hot brass you see there...
Bwah.
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Re: My Mal Pistol Project

Postby drewsmith007 » Sat Nov 23, 2013 4:51 am

And the results...

Image

The backside.

Image

First the bad. Some of the plastic didn't totally burn out, which won't be a problem on the final pieces because I'll be using wax copies. Also, some of the home-made investment came out and either left a void in the mold that was filled with metal (by the safety rest) or a grain of sand got lodged in the part (bottom left of the raised part.) I also need more head pressure, to help the metal fill before it cools. I think that's a big part of the problem with the big hole in the top left.

Now the good. The color of the metal looks really close, but not quite right for some reason. Hopefully it will age a bit. The "tink" it makes is very satisfying! I also really like the way the backside looks, reminds me alot of the production pieces. Also, the shrinkage in the axis of the barrel was only 1.9%, which is almost not worth worrying about. That doesn't include the wax step though, so I'm sure that will make it worse.

Anyway, I couldn't be happier with the results. Well, maybe a little bit, but not much. For the first thing I've cast in brass, first thing in 5 years, and the second thing ever it went pretty well...
Bwah.
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Re: My Mal Pistol Project

Postby drewsmith007 » Sat Nov 23, 2013 5:56 am

Here's the piece cut away from the gates and buffed up a bit.

Image
Bwah.
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Re: My Mal Pistol Project

Postby drewsmith007 » Sat Nov 23, 2013 6:17 pm

And another shot showing this piece fitted in with a plastic part.

Image
Bwah.
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Re: My Mal Pistol Project

Postby F-N-S » Sat Nov 23, 2013 7:35 pm

Looks great so far :thumbsup:
"We're gonna get that show back on the air!"
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Re: My Mal Pistol Project

Postby Goodwolf » Sat Nov 23, 2013 7:45 pm

Very nice!
May have been on the losin' side, still not convinced it was the wrong one.
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Re: My Mal Pistol Project

Postby Alkali Jones » Mon Dec 02, 2013 9:08 pm

Hey drewsmith007,

Looks like you're on the right track. Well done.

Dan S
"Thats what governments are for, to get in a man's way." Capt. Mal Reynolds, Firefly
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Re: My Mal Pistol Project

Postby drewsmith007 » Tue Dec 03, 2013 7:50 am

Thanks! I've poured one more part that was made with a wax copy, and the total shrinkage was around 5%. I didn't vibrate the mold enough though, and there were dozens of bubbles that filled with metal. I knocked most of them off, but not happy with the final product, so I'll post more when I am. The wax did burn out significantly better, faster and less smokey.

From the little bit of schooling I've had on the subject, I think the difference in shrink rate that I'm seeing versus what Badger saw with the 47(a) is due to my pieces not being solid, but more of a shell. The investment on the inside of the shell helps keep it from shrinking as badly.

More to come!
Bwah.
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Re: My Mal Pistol Project

Postby TK421 » Sun Dec 15, 2013 1:49 am

Looks amazing so far, I can't wait to see how the lost-wax versions turn out.
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