Watt's parallel motion

[David W]

Hello all, I am building Brian Rupnows enlargement of Elmers beam engine, and I would really like to fit Watt's motion. Can anyone point me in the right direction for dimensions, ratios etc., or better still has anybody built this engine with the linkage? I am a "newbie" of a few days, so if this topic has been aired before, forgive me. I would like to say a big thankyou to Elmer and also to Brian for their work, which is giving me a lot of pleasure in my retirement.

Regards, Dave

 

[kvom]

http://en.wikipedia.org/wiki/Parallel_motion gives ratios

 

[David W]

Thanks a lot kvom. Looks like I have a lot of work to do! Regards, Dave