Equipment Production Rate

Production = \frac{volume per cycle}{cycle time} \times efficiency

Cycle time includes load, haul, dump, and return. Efficiency (e.g. 45 min/h = 0.75) accounts for delays. Match the number of trucks to the loader so neither waits excessively. Cost per production unit is hourly cost / production.

$t_{c}$ (min): Cycle time
$E$: Job efficiency
$C$ (LCY or m³): Payload per cycle

Step-by-step solved example

Truck: 15 LCY, cycle 12 min, efficiency 50 min/h. Hourly production?

Production is volume moved per hour — think of a cut section hauled.

1. Cycles per hour
Effective minutes 50. Cycles = 50/12 = 4.167. Prod = 4.167×15 = 62.5 LCY/h.
$62.5 LCY/h$

Answer: 62.5 LCY/h

10 practice questions

0/10 correct

1.Efficiency 45 min/h equals

2.If cycle time is cut in half, production

3.Number of trucks to keep a loader busy ≈

4.Owning costs include

5.A 6-min cycle, 10 m³, E = 0.80. m³/h =

6.Rolling resistance is used to size

7.Bank m³ of production must use

8.Idle time of trucks means you probably have

9.Hourly cost $180, production 60 LCY/h: unit cost

10.Grade resistance (US) is about