"Bjarte Runderheim" <[email protected]> wrote in message news:<[email protected]>...
> Victor <[email protected]> skrev i
> meldingsnyheter:[email protected]...
> > Having trouble finding formula for converting a cylinder to cubic
> > feet. How many cubic feet in a cylinder 10" in diameter and 8' long.
> > Trying to figure out how many cubic feet of lumber in a log. Thanks.
> >
> > Vic
>
> Formula: r x r x 3,14 x h, which in this case means:
> 5 x 5 x 3,14 x 8 = 628 cubic inches.
> cubic inches to cubic feet? Im european, so that beats me:-)
>
> Bjarte
1 cubic foot = 1728 cubic inches
"Bjarte Runderheim" <[email protected]> wrote in message news:<[email protected]>...
> Victor <[email protected]> skrev i
> meldingsnyheter:[email protected]...
> > Having trouble finding formula for converting a cylinder to cubic
> > feet. How many cubic feet in a cylinder 10" in diameter and 8' long.
> > Trying to figure out how many cubic feet of lumber in a log. Thanks.
> >
> > Vic
>
> Formula: r x r x 3,14 x h, which in this case means:
> 5 x 5 x 3,14 x 8 = 628 cubic inches.
> cubic inches to cubic feet? Im european, so that beats me:-)
>
> Bjarte
1728 cubic inches = 1 cubic foot
V = (pi)r^2 x h
Where h is the height.
Convert your measurement to inches, apply the above formula, then divide by
1728 cubic inches to get the cubic feet.
--
www.e-woodshop.net
Last update: 9/21/03
"Victor" wrote in message
> Having trouble finding formula for converting a cylinder to cubic
> feet. How many cubic feet in a cylinder 10" in diameter and 8' long.
> Trying to figure out how many cubic feet of lumber in a log. Thanks.
>
> Vic
Ummh. . .slight miscalculation there, Bjarte. One needs to convert
all the measurements to the same unit. You multiplied the radius as
measured in inches but height as measured in feet. The 8 feet needs
to be converted to 96 inches (8 X 12). Following your formula, it
shoud be:
5 X 5 X 3.14 X 96=7536 cubic inches
A cubic foot is 1728 cubic inches (12 X 12 X 12). Therefore, 7536
c.i. = 4.36 c.f.
Thus, a log 10" in diameter (5" radius) and 8' (or 96") long would
have a volume of about 4 1/3 cubic feet.
Ian
"Bjarte Runderheim" <[email protected]> wrote in message news:<[email protected]>...
> Victor <[email protected]> skrev i
> meldingsnyheter:[email protected]...
> > Having trouble finding formula for converting a cylinder to cubic
> > feet. How many cubic feet in a cylinder 10" in diameter and 8' long.
> > Trying to figure out how many cubic feet of lumber in a log. Thanks.
> >
> > Vic
>
> Formula: r x r x 3,14 x h, which in this case means:
> 5 x 5 x 3,14 x 8 = 628 cubic inches.
> cubic inches to cubic feet? Im european, so that beats me:-)
>
> Bjarte
"Bjarte Runderheim" <[email protected]> wrote in message news:<[email protected]>...
> Victor <[email protected]> skrev i
> meldingsnyheter:[email protected]...
> > Having trouble finding formula for converting a cylinder to cubic
> > feet. How many cubic feet in a cylinder 10" in diameter and 8' long.
> > Trying to figure out how many cubic feet of lumber in a log. Thanks.
> >
> > Vic
>
> Formula: r x r x 3,14 x h, which in this case means:
> 5 x 5 x 3,14 x 8 = 628 cubic inches.
> cubic inches to cubic feet? Im european, so that beats me:-)
>
> Bjarte
To conver from cubic inches to cubic feet simply divide by 144 (12^2)
628 / 144 = 4.361
"Bjarte Runderheim" <[email protected]> wrote in message news:<[email protected]>...
> Victor <[email protected]> skrev i
> meldingsnyheter:[email protected]...
> > Having trouble finding formula for converting a cylinder to cubic
> > feet. How many cubic feet in a cylinder 10" in diameter and 8' long.
> > Trying to figure out how many cubic feet of lumber in a log. Thanks.
> >
> > Vic
>
> Formula: r x r x 3,14 x h, which in this case means:
> 5 x 5 x 3,14 x 8 = 628 cubic inches.
> cubic inches to cubic feet? Im european, so that beats me:-)
>
> Bjarte
Doh! Stupid me...divide by 12^3 or 1728...628/1728 = .3634 cf
pi X r squared X height
"Victor" <[email protected]> wrote in message
news:[email protected]...
> Having trouble finding formula for converting a cylinder to cubic
> feet. How many cubic feet in a cylinder 10" in diameter and 8' long.
> Trying to figure out how many cubic feet of lumber in a log. Thanks.
>
> Vic
In article <[email protected]>,
[email protected] says...
> "Bjarte Runderheim" <[email protected]> wrote in message news:<[email protected]>...
> > Victor <[email protected]> skrev i
> > meldingsnyheter:[email protected]...
> > > Having trouble finding formula for converting a cylinder to cubic
> > > feet. How many cubic feet in a cylinder 10" in diameter and 8' long.
> > > Trying to figure out how many cubic feet of lumber in a log. Thanks.
> > >
> > > Vic
> >
> > Formula: r x r x 3,14 x h, which in this case means:
> > 5 x 5 x 3,14 x 8 = 628 cubic inches.
> > cubic inches to cubic feet? Im european, so that beats me:-)
> >
> > Bjarte
>
> To conver from cubic inches to cubic feet simply divide by 144 (12^2)
> 628 / 144 = 4.361
>
Um yes your answer is the correct cubic feet, but the formula used above
is flawed in that the length should have been x12 for cubic inches. The
log is 8 feet long I assume ?
As 1 cubic foot is 12x12x12 inches, you would need to divide by 12^3 =
1728 to convert cubic inches to cubic feet.
Cheers Ray
In article <[email protected]>, Victor <[email protected]> wrote:
>Having trouble finding formula for converting a cylinder to cubic
>feet. How many cubic feet in a cylinder 10" in diameter and 8' long.
>Trying to figure out how many cubic feet of lumber in a log. Thanks.
>
Volume = Area * Length
A = Pi * radius squared. Radius = diameter / 2 = 10" / 2 = 5"
A = Pi * (5" * 5") -- but this will give area in square inches.
Convert to feet:
A = Pi * (5/12' * 5/12')
A = 3.14 * (0.4167 * 0.4167)
A = 0.545 square feet
V = A * 8'
V = 0.545 * 8
V = 4.36 cubic feet
--
Doug Miller (alphageek at milmac dot com)
How come we choose from just two people to run for president and 50 for Miss America?
In article <[email protected]>, [email protected] (SpazMaTaz) wrote:
>"Bjarte Runderheim" <[email protected]> wrote in message
> news:<[email protected]>...
>> Victor <[email protected]> skrev i
>> meldingsnyheter:[email protected]...
>> > Having trouble finding formula for converting a cylinder to cubic
>> > feet. How many cubic feet in a cylinder 10" in diameter and 8' long.
>> > Trying to figure out how many cubic feet of lumber in a log. Thanks.
>> >
>> > Vic
>>
>> Formula: r x r x 3,14 x h, which in this case means:
>> 5 x 5 x 3,14 x 8 = 628 cubic inches.
>> cubic inches to cubic feet? Im european, so that beats me:-)
>>
>> Bjarte
>
>Doh! Stupid me...divide by 12^3 or 1728...628/1728 = .3634 cf
Yeah, except that it's 8 _feet_ long, not 8 _inches_. Calculation above should
have been
5 x 5 x 3.14 x 8 x 12 = 7536 cubic inches
Divided by 1728 cu in / cu ft = 4.36 cu ft.
--
Doug Miller (alphageek at milmac dot com)
How come we choose from just two people to run for president and 50 for Miss America?
Victor <[email protected]> skrev i
meldingsnyheter:[email protected]...
> Having trouble finding formula for converting a cylinder to cubic
> feet. How many cubic feet in a cylinder 10" in diameter and 8' long.
> Trying to figure out how many cubic feet of lumber in a log. Thanks.
>
> Vic
Formula: r x r x 3,14 x h, which in this case means:
5 x 5 x 3,14 x 8 = 628 cubic inches.
cubic inches to cubic feet? Im european, so that beats me:-)
Bjarte
Victor <[email protected]> wrote:
> Having trouble finding formula for converting a cylinder to cubic
> feet. How many cubic feet in a cylinder 10" in diameter and 8' long.
> Trying to figure out how many cubic feet of lumber in a log. Thanks.
Should be something like ((10/12)/2)**2*pi*8
In other words 1/2 the diameter squared, times pi, times length.
Use 10/12 to convert diameter inches into feet.
Bill Ranck
Blacksburg, Va.
In article <[email protected]>,
Bjarte Runderheim <[email protected]> wrote:
>
>Victor <[email protected]> skrev i
>meldingsnyheter:[email protected]...
>> Having trouble finding formula for converting a cylinder to cubic
>> feet. How many cubic feet in a cylinder 10" in diameter and 8' long.
>> Trying to figure out how many cubic feet of lumber in a log. Thanks.
>>
>> Vic
>
>Formula: r x r x 3,14 x h, which in this case means:
OK - *but* both r and h need to be in the same units
> 5 x 5 x 3,14 x 8 = 628 cubic inches.
Nope - 5" radius - but 8' = 96" , so its 7540 cu in
>cubic inches to cubic feet? Im european, so that beats me:-)
12 x 12 x 12 = 1728 is the conversion factor
7540/1728 = 4.36 cu ft
But, while that is the volume of the log, it overestimates the amount
of lumber which result.
--
--henry schaffer
[email protected]
On Fri, 12 Dec 2003 14:36:50 -0500, Victor <[email protected]>
brought forth from the murky depths:
>Having trouble finding formula for converting a cylinder to cubic
>feet. How many cubic feet in a cylinder 10" in diameter and 8' long.
>Trying to figure out how many cubic feet of lumber in a log. Thanks.
Knowing that I should have steered you to the lumber calc
brought me back again with more.
Basic answer:
http://www.thermalinc.com/math/roundtank.htm 6.67cu/ft
Real answer from lumber calc:
http://www.woodweb.com/cgi-bin/calculators/calc.pl?calculator=log_volume
Takes log taper/waste into account. 18 or 30bf, 1.5 or 2.5cu/ft.
-----------------------------------------------------------------
When I die, I'm leaving my body to science fiction. --Steven Wright
----------------------------
http://diversify.com Comprehensive Website Development
Victor wrote:
> Trying to figure out how many cubic feet of lumber in a log. Thanks.
Wow, a math question I can actually answer off the top of my head. Amazing.
I guess I'll always remember that pie are square.
Since it has already been answered in spades, I will interject a smartass
comment instead.
If you have cubic feet, you need to buy some shoes that aren't so tight.
--
Michael McIntyre ---- Silvan <[email protected]>
Linux fanatic, and certified Geek; registered Linux user #243621
http://www.geocities.com/Paris/Rue/5407/
On Fri, 12 Dec 2003 18:03:44 -0500, Silvan
<[email protected]> wrote:
>I guess I'll always remember that pie are square.
No, pie are round. It is corn bread that you were thinking of...
HTH,
--
Kenneth
If you email... Please remove the "SPAMLESS."
On Fri, 12 Dec 2003 14:36:50 -0500, Victor <[email protected]>
wrote:
>Having trouble finding formula for converting a cylinder to cubic
>feet. How many cubic feet in a cylinder 10" in diameter and 8' long.
>Trying to figure out how many cubic feet of lumber in a log. Thanks.
>
>Vic
1 cubic foot = 12^3 = 1728 cu inches
volume of a right cylinder = (pi * r^2) * h
r = 5 inches (radius of the base)
h = 8 * 12 = 96 inches (altitude or height of the cylinder)
plugging into formula...
= (3.14159 * 5^2) * 96
= 7539 cu inches
= 4.36 cu ft (approx.)
On Fri, 12 Dec 2003 14:36:50 -0500, Victor <[email protected]> wrote:
> Having trouble finding formula for converting a cylinder to cubic
> feet. How many cubic feet in a cylinder 10" in diameter and 8' long.
> Trying to figure out how many cubic feet of lumber in a log. Thanks.
>
For a circular cylinder, Pi*r^2*h
For a general cylinder, (base area)*height. It need not be a right
cylinder.
The top and bottom need not be round, but they must be the same shape
and parallel.
The sides need not be perpendicular to the top, but they must be
straight and parallel.
On Fri, 12 Dec 2003 14:36:50 -0500, Victor <[email protected]>
brought forth from the murky depths:
>Having trouble finding formula for converting a cylinder to cubic
>feet. How many cubic feet in a cylinder 10" in diameter and 8' long.
>Trying to figure out how many cubic feet of lumber in a log. Thanks.
http://www.google.com/search?q=board+foot+calculator
Use one of the sites they provide and input your numbers
to get board feet. Divide that number by 12 for cubic feet.
-----------------------------------------------------------------
When I die, I'm leaving my body to science fiction. --Steven Wright
----------------------------
http://diversify.com Comprehensive Website Development
Kenneth wrote:
>>I guess I'll always remember that pie are square.
>
> No, pie are round. It is corn bread that you were thinking of...
Tell that to SWMBO. She makes square pies and round cornbread.
--
Michael McIntyre ---- Silvan <[email protected]>
Linux fanatic, and certified Geek; registered Linux user #243621
http://www.geocities.com/Paris/Rue/5407/