Equalization POC

We’re just two weeks away from the Railway Modellers’ Meet. As I’ve said before, I always like to bring something to display, and I think everyone else should too. What’s more, we committee members agreed to bring something to get the display rolling: I have a commitment to bring a display!

So, I’m working to finish the POC for 622’s frame and springs. Sadly, I wasn’t able to get any quarter-millimetre phosphor bronze, and so, I had to make the equalizing beams from too-soft brass. In any case, the rudimentary tools that are not buried in Mt Flood do not enable me to make the proper shape, and the beams hang below the top chord of the frame, rather than being chastely hidden inside.


As a proof of concept, this version is a bit of a failure. It’s impossible to see what is going on inside the slot, but it seems like the fulcrum is too shallow to act as a fulcrum, or perhaps the slot is too narrow, or perhaps the equalizing beams are bent so they don’t run smoothly in the slots, or maybe the frame itself is bent (I can’t even find a proper straight edge).  Whatever is going on, the equalizing beams should be able to waggle more easily than they do.

Now the question: should I continue to pursue this design, perhaps spend another evening with the Cricut and some MEK?  Or, should I abandon this approach as unworkable and follow the path I blazed with #10?

7 thoughts on “Equalization POC

  1. To pivot or persevere…

    Pivot towards something that looks more promising when your existing path is not successful and your rate of learning on it is slowing down.

    I know that isn’t a clear answer but I don’t have your knowledge of the situation and alternatives…pivot or persevere are always hard decisions so they should be well informed ones diven by data to reduce the effect of unsupported opinion.


    1. I like the alliteration! Okay, well you need at least three data points to even know if your rate of learning is decreasing. So, I cut another set of sides last night.

      I have two hypotheses:
      I should have cleaned off the burrs thrown up by the Cricut knife as these are now interfering with the smooth operation of the equalizing beam.
      Perhaps the channel has been deformed by MEK, and this is stopping the beam from equalizing.

  2. You already know this but the cricket isn’t up to locomotive building or R&D. I wouldn’t base any decisions off of your POC. Better to wait for your tools or spend the time to dig them out. Or make a simpler, better POC with the handtools that you do have. Styrene is useless for these applications. Everything warps – glue goes places it shouldn’t – you can’t polish those areas. All you test is your patience.

    If you still can’t find your tools I can have a look at it. Send me a DFX of what you want and tell me what does /doesn’t matter. I’m busy at the moment but might be able to do something in the coming weeks.


    1. Thanks for the kind offer, Andrew. Yes, if I couldn’t get it to work with styrene, I was going to shift to metal for POC #3. Fortunately, I’ve got a semi-functional prototype in styrene – more tonight.

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