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Old Yesterday, 11:11 PM
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Preston Steam Engine Reversing Gear

Dave has worked out the details of the reversing gear. See the image below. We are using a linear servo that can extend over an inch with a force of 40 newtons (8.99 pounds of push) The single servo will rotate a jackshaft with bell cranks on either end. Lift links attach to the hourglass cages. A tiny bit of slop must be provided for in the lift links, so each lift link will have tiny centering springs to allow for this play. I'll program the servo on the DX10t to precisely move the correct distance to protect the eccentric rods from being bent by the linear servo over-driving the lifting mechanism. In the drawing you are looking at one side of the engine. The 3/16" jackshaft will extend athwartships connecting the other cylinder/reversing gear mechanism. Servo travel speed will be set to smoothly reverse the steam engine.

Snagboat Mike
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Last edited by hookpilot; Yesterday at 11:31 PM.
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