Re: [PSUBS-MAILIST] Catching up and other....

["Sean T. Stevenson" <sts@telus.net>]

I thought that this question was asking how to find the best value to use for 
the width of the unrolled cylinder wall.  If this is to be a rectangular piece 
(such as might be burned on a CNC table), the ideal width will fall somewhere 
between the outer and inner circumferences of the finished hull.  If the hull 
wall is thin, it doesn't really matter, and one can just use the average 
between the two.  A thicker cylinder wall requires using the correct radius in 
the formula, according to how the bending is going to be performed.  Any 
rolling or bending operation will have a theoretical neutral axis which is 
subject neither to compression or tension during the bend.  Based on the 
material, and the machine used to form the cylinder, the ideal unrolled width 
will be the circumference of the theoretical circle which lies on that neutral 
axis.

-Sean


Quoting Chris Nugent <dirkpitt77@yahoo.com>:

> 
> Yep, you're right....I realized how I could figure it out this morning, when
> I was a little less foggy from lack of sleep!  Thanks, though!!
> Chris
>  DBACKIDS@aol.com wrote:The length of the rectangle would be the
> circumference of the cylinder, if I understand you correctly, therefore it
> would be the diameter times pi (D x Pi). The volume of the cylinder is the
> area of a cross section (Radius squared times pi, R2 x Pi) times the  length
> of it (R2 x Pi x L). Be forewarned, this will give you a figure in cubic
> (insert whatever unit of measure you measured the cylinder in: feet,
> centimeters, inches, miles...). If you have the volume, you can create a
> formula for the length and radius of the cylinder, but unless you have two of
> the measurements (length, volume, radius), you can't find the third. My
> overstated two cents worth.
> 
> David C 
> 
> 
> ---------------------------------
> Do You Yahoo!?
> HotJobs, a Yahoo! service - Search Thousands of New Jobs