Mathematics formulas…..

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Ray
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Mathematics formulas…..

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GunnyMack
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Re: Mathematics formulas…..

Post by GunnyMack »

From your title I wasn't expecting this, good info none the less!

Now what I WAS expecting was

Pie r round corn bread r square
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Re: Mathematics formulas…..

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vancelw
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Re: Mathematics formulas…..

Post by vancelw »

For pi did you use 3.14159265359, 3.14 or 22/7?

:D

I got a chuckle researching drilling markings the other day and reading discussions about plug gauge vs. Bore diameter.
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Re: Mathematics formulas…..

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vancelw wrote: Fri Oct 13, 2017 5:00 pm For pi did you use 3.14159265359, 3.14 or 22/7?
355/113 is really close...one of the first computer programs I ever wrote was a routine to start with n=0 and d=1, incrementing n until n/d>pi, saving ]((n-1)/d)-pi[, then if ](n/d)-pi[ was smaller, save it and discard the previous value. Then increment d and reset n=0, and repeat the process, saving the next "]((n-1)/d)-pi[" only if it was smaller than the previous saved one (the programmable calculator of the day back then only had three memory registers), and continue the process. It took a minute or so to get to 355/113, but on up into 4 or 5 digits I don't think it found a closer match.

Now days a computer could carry that into ten digits faster than you could say "pi", but I couldn't even begin to figure out how to do that on a 'windows' machine though... :oops:

I always thought it would be nice to teach my kids basic programming, but I don't even know if they make programming languages and compilers like the ones I used; you could use TurboPascal to do about anything, including embedding assembly language code if you wanted something really fast.
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vancelw
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Re: Mathematics formulas…..

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The problem with that is, you had to know the value of pi to find the fraction it was closest to.

Old gun makers didn't know the exact value of pi and had to do all calculations by hand. So using a modern value of pi might not get the results y oy seek when trying to convert gauge to diameter. The same goes for the specific gravity of lead. You'd need to use the value the old gun makers used
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Ray
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Re: Mathematics formulas…..

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Re: Mathematics formulas…..

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My head hurts after reading this... there was a reason I was an English major!
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Re: Mathematics formulas…..

Post by Bronco »

I like to use rhubarb for pi :mrgreen:
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Re: Mathematics formulas…..

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Ray wrote: Fri Oct 13, 2017 3:38 pm
GunnyMack wrote: Fri Oct 13, 2017 10:51 am From your title I wasn't expecting this, good info none the less!

Now what I WAS expecting was

Pie r round corn bread r square
actually pi r square is needed to cipher that last method of measurement since it is cylindrical….but it was whole lot easier just to do the simple math re. length/ratio, cut a stub of the barrel, plug one end and fill with powder…..then a more suitable charger would be fashioned from tubing or antler/bone or even Physeter macrocephalus tooth with the same volume….

I use clear medical graduated cylinder sample tubes using the 15 gr. of powder guestimation per cubic centimeter which quickly gives me 60, 75, and 90 grains volume that I use most frequently….the tubes are used for both chargers and, with top screwed-on, for holding pre-measured charges….
Where did those cylinders graduate from, and did they graduate magnum gun loud.
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Ray
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Re: Mathematics formulas…..

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Re: Mathematics formulas…..

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It was just some lab humor. :D
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Re: Mathematics formulas…..

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piller wrote: Sat Oct 14, 2017 11:23 pm It was just some lab humor. :D
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I remember that the "correct" amount of powder was to put the ball on a sheet of paper, and slowly pour BP over the top until the ball was completely covered. Beats me. On my old .54 Renegade the max load was 120 of Pyrodex P and I would load 30-40 for plinking and squills...
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Ray
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Re: Mathematics formulas…..

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Re: Mathematics formulas…..

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Ray wrote: Sun Oct 15, 2017 7:12 pm
BlaineG wrote: Sun Oct 15, 2017 1:12 pm
On my old .54 Renegade the max load was 120 of Pyrodex P and I would load 30-40 for plinking and squills...


The tuba man is way braver than me with 120 gr. of pyrodex p....
The Pyrodex P burns slower than FFFG.This was a 1980 kit. That load was mentioned in the instructions from T/C. As a matter of fact, Pyrodex R was the second choice in the book if you didn't want to use black. PDex was harder to ignite than black, and the "P" was easier to light off than the "R".... The T/C figures for 120 gr of "P" was 2,000 fps...BTW, 90 grains was more than enough for me. That 120 gr load was not that accurate, as is most max loads...
BTW, I have no idea what other loads other rifles are using. Just this one particular T/C .54 Renegade. I might be crazy, but I'm not stupid.
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