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Author Topic: Poncelet design help  (Read 5609 times)

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southline

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Poncelet design help
« on: October 05, 2011, 11:47:19 PM »
Hi all, just looking at the design calculator, I don't understand what the B angle is.  My friend is runs a machine shop so building a poncelet waterwheel is no problem-- CNC plasma cutters, lathes, lots of good experience, but I would like to design it right.  I was hoping the he could just use his auto cad program but niether of us are that "savvy".  Can anyone explain that "B thingy" or should we go back to geometry class  ?  :)
   
http://24volt.eu/poncelet.php

Adam



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TomW

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Re: Poncelet design help
« Reply #1 on: October 05, 2011, 11:54:02 PM »
I think it is a symbol not a "B" Something to do with arcs and or segments?

This is the drawing to save a few clicks:



As far as the text on the page, I don't even know what language it is so no clue if they define it in there?  ???

Tom
« Last Edit: October 05, 2011, 11:56:48 PM by TomW »
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rossw

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Re: Poncelet design help
« Reply #2 on: October 06, 2011, 12:31:06 AM »
Quote from: TomW on October 05, 2011, 11:54:02 PM
As far as the text on the page, I don't even know what language it is so no clue if they define it in there?  ???

Looked like Sweedish or Norweigen to me.... so I tried:

http://translate.google.com.au/translate?hl=en&sl=sv&tl=en&u=http%3A%2F%2F24volt.eu%2Fponcelet.php
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Simen

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Re: Poncelet design help
« Reply #3 on: October 06, 2011, 02:52:45 AM »
Yes, it's Swedish. :)

The Beta symbol stands for the angle of the buckets. As the text describes; 'Poncelet put the buckets at an angle so the water didn't hit the buckets right on, but instead climbed up the curved edge og the buckets, and then the water slides off around 15 degrees behind the wheel's axel.
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keithturtle

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Re: Poncelet design help
« Reply #4 on: October 06, 2011, 08:14:54 AM »
Quote from: Simen on October 06, 2011, 02:52:45 AM
Yes, it's Swedish. :)

 and then the water slides off around 15 degrees behind the wheel's axel.
... probably to extract whatever energy is left in the velocity past vertical

Turtle
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TomW

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Re: Poncelet design help
« Reply #5 on: October 06, 2011, 09:10:09 AM »
Quote from: keithturtle on October 06, 2011, 08:14:54 AM



 and then the water slides off around 15 degrees behind the wheel's axel.

... probably to extract whatever energy is left in the velocity past vertical

Turtle

Yep, a sneaky way to keep the water at work for a longer stroke.

Tom
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southline

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Re: Poncelet design help
« Reply #6 on: October 16, 2011, 10:13:08 PM »
The Beta symbol stands for the angle of the buckets. As the text describes; 'Poncelet put the buckets at an angle so the water didn't hit the buckets right on, but instead climbed up the curved edge og the buckets, and then the water slides off around 15 degrees behind the wheel's axel.

I could understand if the buckets were straight.. How do you find the angle of a curved bucket? 
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