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- ScaleCalc
-
- ScaleCalc is a set of simple model railroad calculators which include a
- scale convertor, a grade calculator, and a helix calculator. Each of
- these calculators is presented in its own window. You may have as many
- of each window open as memory allows.
-
- ScaleCalc is email-ware. If you like it, send me email. Please feel free
- to include complaints, comments and suggestions.
-
- The Scale Calculator
-
- The scale calculator is the simplest of the windows to operate. Just
- enter a set of measurements in either the unscaled or the scaled
- section, select a scale and click on the arrow pointing to the other
- section. For example, entering 1 in the miles box and clicking on the
- downward arrow will generate a scaled measurement of 60 feet 7 and 7/16
- inches. (Note: If you follow this by clicking on the upwards arrow, the
- result will be 5279 feet, 11 and 51/64 inches. Since measurements are
- only kept to the nearest 1/64 of an inch, some accuracy is lost.)
-
- Conversion between scales is a two-step process best illustrated by
- example. If an HO-scale object (say a car) measures 10 (real) inches,
- and you want to know the size of the same object in N scale, enter 10
- into the inches box in the scaled section. Select HO as the scale and
- click on the upwards arrow. Then select N as the scale and click on the
- downwards arrow. The scaled section will now show a length of 7 and 7/16
- inches.
-
- The Grade Calculator
-
- To use the grade calculator, fill in any two of the four factors:
- horizontal distance, incline (track distance), rise, or grade. For grade
- use the percent, such as 2.5. Click on the "Use" radio buttons for the
- factors that you want to base the calculation on and the "Compute" radio
- buttons for the two factors that you want to compute. This will make the
- "Compute" push button at the bottom of the window active. Click it to
- calculate. Note: Exactly two "Use" radio buttons must be on to make the
- Compute push button active.
-
- Only for very high grades or very long grades will there be any
- noticable difference in the horizontal and the incline distances.
-
- The Helix Calculator
-
- For the helix calculator, three of the four factors must be filled in.
- Here the factors are total rise, radius, number of turns, and grade. You
- may use a decimal point in the radius, turns, and grade boxes. (For
- example, 3.5 turns or 36.5 inches radius.) As in the grade calculator,
- exactly the right number of "Use" radio buttons must be on for the
- "Compute" push button to be active.
-
- Rise per turn is computed because it must be enough to allow
- clearance for train, track and supporting structure.
-