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Re: off topic....
On Fri, 15 Oct 2010 16:26:50 +1300, David Shorter

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buttons.
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[divide] [pi] [=] [square root]
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answer will the be the required diameter.

Can you explain why you felt the need to include pi in the equation?
You don't need to calculate the actual_area, just the ratio.

So the O/P enters the required ratio (1.33 as you indicated for his
example 33% CSA increase), take the square root, and multiply that by
the original size.

Re: off topic....

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buttons.
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[divide] [pi] [=] [square root]
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answer will the be the required diameter.
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I agree with your method of calculation. No necessity to involve pi in
any way.

Be careful as well of the 1.73mm answer as that was calculated using
an initial diameter of 1.5mm and not 1.17mm!
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Re: off topic....
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root" buttons.
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increase) [divide] [pi] [=] [square root]
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.....)
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the answer will the be the required diameter.
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He gave the impression that he didn't understand areas, not just the ratio am so
I took him through
the steps that calculate the area which should help him to get a better
understanding of what he's
trying to achieve.

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Well he did give the diameter as 1.5mm in his first post.

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Regards,
David Shorter

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Re: off topic....
On Sun, 17 Oct 2010 03:06:03 +1300, David Shorter

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size
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I realised that, but the OP changed the diameter part way through so I
just wanted to warn him not to take some of the answers on here as
gospel!

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Re: off topic....

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rec.crafts.metalworking perhaps?

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