Twin Cylinder Steam Engine

Patrick

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Had to put the Atlantic locomotive on the shelf for a while so in the mean time I decide to start building a stationary two cylinder reversing steam engine I drew up last winter. So far I have the cylinders bored but not yet honed, the crosshead guides are machined, valve plates are done and I have the parts for the crankshaft machined. Hope to get the crank silver soldered up this week and move on to other parts. I think it should work out OK, I will use walchert reversing gear, on paper all looks well, but then there is reality. Time will tell
Regards
PatP1020393.JPG
 
Now that's the kind of build I like to see, Pat. I'll be watching.
 
Looking good! Can't wait to see this project come along as I have a real soft spot for steam engines. Bob
 
Hope those aren't 2-56 socket heads. Keep posting and include some sizes so I can envy in the proper scale. Good Work!
 
Well this week I got the crank shaft made, the pedestals for the crank, and started on the flywheels. The crank has a 1 3/4" stroke, shaft is 1/2" silversoldered together with 56% silver, supposed to be 70,000 lb tensile strength. Flywheels are 5 1/2" dia. made from schedule 80 steam pipe with aluminum hubs.
Andy, the screws used on the crosshead support are 4-40, I am not following any perticular scale, I do my layout on autocad and adjust the size of the components to my satisfaction. Bore is 1 1/4" and the stroke is 1 3/4". The fasteners on the center pedestal are temporary, I ran out of 6-32 all thread.P1020429.JPG P1020430.JPG
P1020428.JPG
 
Hi Patrick,
I have never seen a crosshead support quite like you have. How does it support the end of the piston shaft to connecting rod joint?
gbritnell
 
Not sure how I've been missing this thread.. it won't happen any longer!

Great project.
 
How does it support the end of the piston shaft to connecting rod joint?

With any luck at all, the Crosshead is cylindrical on its OD, tapped for a piston rod (just a straight piece of steel with threads on both ends) on one end and slotted to accept the connecting rod on the other. The crosshead guide is bored to match the OD of the Crosshead.
 
gbritnell, attached is a picture of the drawing showing the cylinder assembly, the connecting rod attaches to the crosshead and the crankshaft. The crosshead guide will either have bronze bearings or ball bearing, haven't made up my mind as of yet but leaning toward bronze.
Hope this will help.
Regards
PatrickP1020449.JPG
 
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