On 06 Nov 2003 22:25:59 GMT, (JMartin957) wrote:


I guess you didn't try it, did you? Because if you did, you'd know exactly why
it won't work.

You are talking about using the pattern to cut the point on the end of a piece
of pipe, rather than a vee in the middle, but no matter because it's the same
thing.

Given your example, the two ends of the arc on your pattern are exactly 1"
apart. On the piece of pipe you want to cut, the two points or the bottoms of
the vees will be 1" apart, as that is the diameter of the pipe. But, when you
wrap your pattern around the pipe, the ends of the arcs won't make it halfway
around the pipe - because halfway around the pipe is really 1.57", or pi over
2. Because the paper has to wrap around the surface of the pipe, doesn't it?

And not only will your pattern not stretch halfway around the pipe, as it
should, but when you trace it you'll find that the ends of your arcs meet the
square end of the pipe at an angle (tangent) of 90 degrees. Not at 45 degrees
as they should.


-----The poster who suggested using a rubber ring as a pattern will get the same cut
-----you do, although with the flex and stretch of the ring he'll get closer.

John Martin

And I assume that you didn't try the ring gasket wrap method because
if you did, you would have seen that it does indeed work! I do it all
the time. Don't need no formulas or pi or calculators.
Turn off your calculator, get off your ass and go out in your shop and
try it.

Geez, the guy asked for help laying out a piece of pipe not a lesson
in math. Hell, if we all understood how to mathmatically design a
template for this stuff we wouldn't ask for help.

Instead of telling everybody else how wrong they are and why according
to your calculator, their idea stinks, why don't you whip up a
template for the guy so he can get his pipe cut because all the rest
of us don't know what we're talking about.

I'm gonna go cut some pipe.

James