Lap of Flange given Extra Width of Track Calculator

Formula Used:

\[ L = \sqrt{\left(\frac{W_e \times R}{125}\right) - W} \]

Extra Width (We):

Radius of Curve (R):

Wheelbase (W):

Tolerance:

Lap of Flange (L): mm

1. What is Lap of Flange?

Definition: Lap of flange refers to the projecting edge or rim on the circumference of a steel wheel that is designed to keep the wheel on a rail.

Purpose: It helps railway wheels stay on tracks, especially on curves where extra width is needed.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ L = \sqrt{\left(\frac{W_e \times R}{125}\right) - W} \]

Where:

\( L \) — Lap of flange (mm)
\( W_e \) — Extra width of track (mm)
\( R \) — Radius of curve (mm)
\( W \) — Wheelbase (mm)

Explanation: The formula calculates the necessary flange lap based on track geometry and vehicle dimensions.

3. Importance of Flange Lap Calculation

Details: Proper flange lap ensures safe rail operation, prevents derailments on curves, and reduces wear on both wheels and rails.

4. Using the Calculator

Tips: Enter the extra width of track, radius of curve, wheelbase (all in mm), and tolerance percentage. All dimensional values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical tolerance for flange lap?
A: ±5% is common, but this may vary based on specific railway standards.

Q2: How is extra width of track determined?
A: It's calculated based on curve radius, vehicle dimensions, and operating speed.

Q3: Why is wheelbase important in this calculation?
A: Wheelbase affects how a vehicle negotiates curves and thus influences the required flange lap.

Q4: What happens if the flange lap is too small?
A: Insufficient flange lap increases derailment risk on curves.

Q5: How often should flange lap be checked?
A: Regular inspections should be performed as part of routine wheel maintenance.