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About ScaleSeven
Working Dimensions and Tolerances
The numbers refer to the table on Track and Wheel Standards and correspond with those on the other pages in this section.
ScaleSeven Standard Dimensions |
mm |
in |
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1 |
Track gauge (straight track) |
min |
33.00 |
1.299 |
2 |
Gauge widening |
max |
0.45 |
0.018 |
3 |
Tyre width (loco) |
min |
3.16 |
0.124 |
|
Tyre width (loco) |
max |
3.26 |
0.128 |
|
Tyre width (coach and wagon) |
min |
2.90 |
0.118 |
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Tyre width (coach and wagon) |
max |
3.00 |
0.118 |
4 |
Back-to-back |
min |
31.20 |
1.228 |
max |
31.30 |
1.232 |
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5 |
Effective flange |
|
0.66 |
0.026 |
6 |
Back-to-back + one effective flange |
min |
31.86 |
1.254 |
max |
31.96 |
1.258 |
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7 |
Check rail gauge |
min |
31.98 |
1.259 |
max |
32.08 |
1.263 |
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8 |
Crossing flangeway (straight track) |
min |
1.00 |
0.039 |
max |
1.08 |
0.043 |
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9 |
Over check rail faces |
min |
30.85 |
1.215 |
max |
31.08 |
1.224 |
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10 |
Crossing flangeway – effective flange |
min |
0.34 |
0.013 |
max |
0.42 |
0.017 |
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Verification of Clearances |
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11 |
Minimum check rail gauge – (maximum back-to-back + one effective flange) |
= 31.98 – (31.30+0.66) = 0.02 minimum clearance |
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12 |
Minimum track gauge – (maximum back-to-back + two effective flanges) |
= (31.30+1.32) = 0.38 minimum clearance |
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13 |
Minimum back-to-back – maximum over check rail faces |
= 31.20 – 31.08 = 0.12 minimum clearance |
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