Dan Rowe
Well-Known Member
- Joined
- Feb 12, 2010
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I think the three most common steam valve diagrams were Zeuner, Reuleaux, and Bilgram in that order. I will show how to construct each one.
The grandaddy of all of these is of course Zeuner so lets start there. I have a copy of Treatise on Valve-Gears by Dr. Gustav Zeuner but it is mostly Greek in the form of algebraic notation. It is well beyond my comfort level with mathematics.
I did find a drawing of the machine made at the University of Pennsylvinia used as a drafting instrument to construct Zeuner Diagrams. It was made to the same dimensions listed in Zeuner's book. It is very clever. It is a cut away engine much like a valve gear trainer but a drafting board is mounted on a spindle near the valve. Thie board is made to rotate at engine speed and a pencil is attached to the center of the valve. The curves generated on the board is what Zeuner used complex math on to replicate with his diagram. Now really how cool is that?
The next post I will use one of my favorite authors William Ripper to loft a Zeuner Diagram for a two cylinder launch found in Machine Drawing and Design.
Dan
The grandaddy of all of these is of course Zeuner so lets start there. I have a copy of Treatise on Valve-Gears by Dr. Gustav Zeuner but it is mostly Greek in the form of algebraic notation. It is well beyond my comfort level with mathematics.
I did find a drawing of the machine made at the University of Pennsylvinia used as a drafting instrument to construct Zeuner Diagrams. It was made to the same dimensions listed in Zeuner's book. It is very clever. It is a cut away engine much like a valve gear trainer but a drafting board is mounted on a spindle near the valve. Thie board is made to rotate at engine speed and a pencil is attached to the center of the valve. The curves generated on the board is what Zeuner used complex math on to replicate with his diagram. Now really how cool is that?
The next post I will use one of my favorite authors William Ripper to loft a Zeuner Diagram for a two cylinder launch found in Machine Drawing and Design.
Dan