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Braking gear design

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  • #16
    Mike, I can't thank you enough for those drawings, now I'm clear on how the brakeshoes are hung and articulated.

    Jim, Jbvb, Dave, thanks for the additional insight! I believe I now have the knowledge that I need to at least get started. I will surely post around here, once I get started - unfortunately, this might take a little time.

    Dave, I can't seem to grasp the concept, but from what I understand the prototypical hand brake overrides the air brakes. So the piston shouldn't need to move at all for the hand brakes to articulate all eight wheels, or am I mistaken? Of course the consequence would be to lock the brake cylinder's piston in place first and equip it with some kind of servo later, so it holds its position against the hand brake's actions. What are your thoughts on that?

    Many thanks and best regards,

    Frederic

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    • #17
      In the Wabtec manual I linked to, the diagram on page 5 shows that the brake cylinder piston will move when the hand brakes are applied. The cylinder pushes on one side of the cylinder lever, the handbrake pulls on the other side. I believe this is typical; the interurban I was working on certainly had that layout.
      James

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      • #18
        You can leave the piston or a 'dummy' doppelganger disconnected until you want to add a servo.

        Jim
        Take the red pill

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        • #19
          jbvb, thanks for pointing it out. In hindsight it's quite obvious, but well, I'm still quite the beginner.

          Jim, true.

          Right now, my plans are shaping up quite nicely and I'm considering some more steps to this project.

          Last spring I already built a truck (bogie), loosely based on an early sterlingworth prototype.

          With your help I now understand that this particular design is unable to accomodate brake shoes on the inside and it would require the top archbar to be longer, so the brake hangers can attach there.

          So, I'm playing the modeler's license card and assume, that my railroad company owner would want to keep every old bit of material running. That means:
          1. I'll build a second sterlingworth bogie with outside brakes and rig it to a hand brake. My first flatcar will thus represent a very old model with no air brakes, presumably violating railroad regulation laws.
          2. With what I'll learn from that, I'll build a second flatcar with more modern bogies and try to set up the complete braking rig, including a dummy braking cylinder.
          3. The final, and possibly optional step would be to articulate the braking cylinder with an R/C servo. Since this requires some space and effort, I'm inclined to try that with a caboose rather than a regular freight car.
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          I'll keep you posted on any progress, thanks again for all the help, insight and humor!

          Frederic

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