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Hugh,There's no particular reason I'm doing the gear crank option as it won't be used. I may switch the design to a simple crank-rocker mechanism because it is more simple than the gear system. I will look into some gear sizes for the crankshaft and see if I can pull the CAD models into my assembly if the price is reasonable. Thanks for your suggestions,Dave,I am modeling Watts Engine. Not Newcomen's. It will be using compressed air and not all the parts will be used, as the double acting system will exhaust to the atmosphere, as opposed to steam being pulled into the condenser with vacuum pressure. The condenser and air pump will me modeled but will only be sitting there for discussion purposes. I hope this makes sense. I too am researching this and learning about these engines as I go further in this course.Thanks you for your response Dave.
Biggest reason for the gears was to get around another makers patent on the crank mechanism. Once the patent expired, they stopped using that geared setup.