Author Topic: What to do? (Read 797 times)

guardsgunner · « **on:** June 25, 2005, 04:08:57 AM »

A friend from work gave me a piece of brass 4" d X 24" long (its good to have friends) and I have been trying to figure out what to make out of it. I lack around .200 of being able to make 3, 1/2 scale fed. mortars. I could fudge the proportions a little, but what to use for ammo in the neighborhood of 2.750"?
Or are there any better idea's of what I should do with this brass? Be nice.
I only have a 9X20 here at home and getting stuff into work is almost harder than getting stuff out these days.

Double D · « **Reply #1 on:** June 25, 2005, 04:56:30 AM »

I would scale a Federal mortar to the stock dimensionsyou have.

Major diameter of the Federal coehorn is 8.65 inches. 8.65 divided by 4 equals 2.1625. Divide all the measurements on a Federal full size mortar drawing by 2.165. round the numbers to something work able

Length will be just under 16 inches divided by 2.1625 or 7.399inches. bore would be 2.691. Ball diameter would be 2.624. You might have to make some slight adjustments to bore for the barrel liner.

For a ball mold get Powderkeg to whip you one up or learn incremental radius turning. I just ordered Guy Lautards book from his website Tables and Instructions for Ball and Radius Generation $20 US included shipping. I caught it when Powderkeg mentioned using this book to make my mold.

After that send me a PM and I will send you my address so you can send me the left over 14 inches of brass scrap for disposal. I will dispose of it for you, being the nice earth first type that I am, that I will. You will have to pay shipping of course. :roll: :roll: :wink: Nice guy aren't I.

GGaskill · « **Reply #2 on:** June 25, 2005, 06:20:07 AM »

4" material gives a 46% scale Coehorn. I can send plans if you like. Overall length of the TUBE is 7.007" so you have more than enough for three. Beer cans fit nicely (2.65" dia.); they are best cut off at half length.

I made this tube earlier this week.

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guardsgunner · « **Reply #3 on:** June 26, 2005, 01:38:56 AM »

DD,
The book suggestion sounds like a good one. I got tired of doing math years ago and made a nice ball cutter: only goes to 3". Being machined from solid; I am not going to use liner.
My son isn't interested in a toy so there may be extra. Delivered south of the Mason -Dixon , maybe. Pay freight?.......a ahh - no. :grin:

GG,
If you have something already drawn for this scale/stock size please send. If not, I think I still have drawing for the 24pdr. somewhere.
Thanks

Double D · « **Reply #4 on:** June 26, 2005, 06:08:24 AM »

Guardsrunner, in all seriousness after you make your coehorn, put the left over stock on the shelf for future projects and trade stock.

Brass isn't strong enough, in my opinion to be used as is.

guardsgunner · « **Reply #5 on:** June 26, 2005, 01:44:28 PM »

DD,
I went and took a look at strengths and perhaps your right. Sure would be pretty but maybe for something else. Thanks

Cat Whisperer · « **Reply #6 on:** June 26, 2005, 02:21:33 PM »

GG -

That sounds like a reluctant decision to do the right thing over the desire for something wanted!

That's an INTELLIGENT decision!

Double D · « **Reply #7 on:** June 26, 2005, 04:45:54 PM »

Put a liner in it. Straight liner with a breech plug that has a powder chamber in it. The liner would not have to be that thick and could be epoxied in place.

GGaskill · « **Reply #8 on:** June 27, 2005, 03:04:28 AM »

Regarding the liner, if you are planning on using beer cans for shot, the wall thickness of a scale US 1841 Coehorn is less than a half inch and I think you would be gaining little by using a thin steel liner.

If you are of the experimental nature, go ahead and make a 46% scale 1841 Coehorn and see what happens. If you want thicker walls, use smaller cans, Red Bull or orange juice cans, maybe. Make the powder chamber only 3/4" in diameter to limit the amount of powder you are tempted to use.

I think a sub-beer can caliber brass Coehorn would be fine.