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72751Re: [Z_Scale] Re: electric pick-up problems Wheel spacing

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  • BAZ
    Apr 29, 2013
      Well . . . the back-to-back sets a guide for inside turnout guard rails but doesn't account the variation in the flange and tread profile. Even the manufacturers have issues, with manufacturing tolerance on wheels to turnouts. Märklin locos, turnouts and Rokohan track have never had gauge issues.

      I use both the Nn3 standard gauge (via Northwest Short Line) and MTL's track/coupler gauge. I find that if any manufacturers flange (that maximal diameter part) it's in the *middle* of the notch, it run on anything. A few thou either way (the width of that notch) and you can have issues.

      Rodney's tools made a wheel gauge tool. Needs a chamfer gradient files on one edge to allow it to get on under gauges axles. Still, check the flange. At least it makes the wheels parallel (some just put a screwdriver in there and wedge the wheel out, causing wobbling.

      SF Bay Area Z

      Sent 'from the road'

      On Apr 29, 2013, at 7:38 AM, "mark2playz" <mark.markham@...> wrote:

      > Bret,
      > Kinda complicated answer. The back-to-back measurement should be 0.214 +0.002 -0.007 inches per the NMRA Standard 4.2. But you may want to get a copy of the fill spec from nmra.org. As I tried to point out to the Z Standards group a couple years back, the tolerance on the standard dimensions do allow for wheel sets that won't work well.
      > Hope this helps,
      > Mark
      > --- In z_scale@yahoogroups.com, "Bret" <azbret59@...> wrote:
      > >
      > > I have been repairing z scale engines for people. I always have trouble with the engines being sloppy between the rails causing terrible electric pick-up problems... I always find that the wheel sets are squeezed together making the engines jumpy and not able to have good contact.. Does anyone know what the correct wheel spacing measurement is to fit the track??
      > > THX Bret
      > >

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