Templot Club Archive 2007-2020
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posted: 4 Feb 2012 17:42 from: Hayfield
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I have just brought a digital vernier caliper, testing my trackwork and RTR track there seems to be a few hundresds of a mm variation. Even between EM Gauge Soc and C&L gauges. Some of the variation may be down to the gauge as its a cheap one, but it seems quite consintant with its readings Please what is an acceptable + or - variation in both EM and 00 track gauge |
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posted: 4 Feb 2012 18:22 from: Martin Wynne
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Hayfield wrote:Please what is an acceptable + or - variation in both EM and 00 track gaugeHi John, To be worthy of the name a track gauge tool should be within +/- 1/2 thou (0.0005") or 0.015 mm of the specified dimension -- i.e. a range of 1 thou (0.001") or 0.03mm. That's for the track gauge tool itself. You can't expect to build track containing wooden and plastic parts to similar tolerances. Note that the specified track gauge dimension is always a minimum. So for EM the track gauge tool should measure between 18.20mm and 18.23mm to be acceptable, and preferably nearer the minimum. Likewise for 00-SF the track gauge tool should measure between 16.20mm and 16.23mm. In practice it is not the end of the world if these dimensions are exceeded for the running rails. The important one is the check gauge tool, which should be discarded if not between 17.20mm and 17.23mm for EM, or between 15.20mm and 15.23mm for 00-SF: 2_151030_530000000.png  regards, Martin. |
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