Barrel weight per inch ????

[Skychief]

I would like to know the weight per inch of the following straight octagon barrels:


3/4",  29 caliber.

13/16",  32 caliber.


Thanks to anybody providing the above weights!   Skychief.

[SCLoyalist]

Assuming steel weighs .283 lb/cu inch, and disregarding groove depth,

the .32 ought to go about 2.1oz/inch, and the .29 ought to weigh in around 1.8 oz/inch.

Least, that's what I came up with.

(And, an old DGW catalog has a table in the back that says a 43" long, 13/16" barrel in .32 weighs 6 lb-2 oz, which is a little different than I came up with.)

[smylee grouch]

TOTW catalog and Rice web site lists wt. of cal per size on alot of different barrels so you might be able to figure out your barrels wt. there .    Gary

[Ky-Flinter]

From the TOW website, here's the spec's on a .32 cal Green Mountain barrel.  I couldn't locate anything on the 29.

GMT-32-A-42 barrel, .32 caliber, 13/16" octagon, 42", 1-48" twist, 5.45 lb, crowned, 9/16-18 thread

5.45 lbs = 87.2 oz. divided by 42" = 2.076 oz. per inch

Hey SC....  Looks like your ciphering is on the money!

-Ron

[Dphariss]

I would like to know the weight per inch of the following straight octagon barrels:


3/4",  29 caliber.

13/16",  32 caliber.


Thanks to anybody providing the above weights!   Skychief.

The 13/16 x39" long will weight just under 7 pounds

Find a formula for octagonal bar weights, calculate the weight of the octagonal bar.
Then calculate the weight of a round bar of a diameter similar to the bore.
Subtract the round bar from the octagonal bar and you have an approximate weight.
A google search might allow you to find a calculator such as this.
http://www.steelforge.com/steelweights.htm


Dan

[Trkdriver99]

You fellers sure are brilliant.

Ronnie

[Dphariss]

From the TOW website, here's the spec's on a .32 cal Green Mountain barrel.  I couldn't locate anything on the 29.

GMT-32-A-42 barrel, .32 caliber, 13/16" octagon, 42", 1-48" twist, 5.45 lb, crowned, 9/16-18 thread

5.45 lbs = 87.2 oz. divided by 42" = 2.076 oz. per inch

Hey SC....  Looks like your ciphering is on the money!

-Ron

TOWs numbers don't always make sense.
I have a spread sheet with the formulas that is pretty close, I used to build guns for weight limited competition, but its out of reach right now. If I can remember I will post the formulas in a couple of days.
I thought I might have posted it here but it does not appear when I search
Dan

[Dphariss]

I went back and played with the link I first posted, forget it (read "I goofed").
I  trust my spreadsheet. Its usually within an ounce or so. If everything is done right.
To calculate a straight taper barrel use the the mid-point dimension.


Try this link if you have not found it.
http://www.matweb.com/tools/weightcalculator.aspx
With a 13/16 (.812) barrel with a .320 bore we get about 6 pounds at 39". Ball park for DGW

Dan

[SCLoyalist]

The weight of an octagonal bar, W inches across the flats, and L inches long is

                     .8184 X W X W X L    X   0.283 lbs  

If you bore a circular hole in it of C inches in diameter, you'll  remove
                     .7854  X C X C X L * 0.283 lbs of steel

Take the difference of the two to get how much steel is left, and multiply by 16 to convert to ounces.  (And adjust the .283 up or down if you have a value for density of steel you're more comfortable with.)

Example, a 1" across the flats steel octagonal bar 30 inches long weighs  .8184(1)(1)(30)(0.283)=6.95lbs

     Bore a .400 hole through it,  and you remove .7854(.4)(.4)(30)(.283)  = 1.07 lbs of steel

     What's left is 6.95-1.07= 5.88 lbs or 94.1 oz.  

[John A. Stein]

Dixie catalogs always had tables in the back that had that and a lot of other information. I don't have their latest catalog, but the catalog didn't change much from year to year, so the information may still be there. Best take a look.  John

[Skychief]

Thanks a lot fellas!   I am taking all this in.   I have looked in the back of Dixie's catalog.   Of course, there is no mention of 29 caliber barrels.    Thanks again for the help!

Reason I asked about this....I have a 42", 13/16", 32 caliber.   A buddy has the 29 caliber of 3/4" by 38".    I am hoping to get a  balance from my .32 similar to his .29, and need an idea of where to cut it.

Skychief.