This article explains how waste is calculated and how it factors into the total amount of lost time.
Table of Contents:
Key Terms
| Term | Definition |
| Lost Time | The production time lost at the bottleneck of a process. Lost time cannot be regained. |
| Total Waste | The total amount of waste produced during a run. |
| Average Speed | The average speed the line ran at. |
| Target Weight | The target weight for a product. |
Lost Time Making Waste
An important distinction is where the waste occurs in the production process. Waste that is before the bottleneck does not create Lost Time Making Waste. Any waste produced by the bottleneck or after is Lost Time Making Waste because it had to first travel through the bottleneck resource.
To start tracking this lost time, all you have to do is create Waste Reasons and have your operators enter the amount of waste using the tablets.
Calculations
| Formula | Example |
| Lost Time Making Waste = Number of Units Wasted / Average Speed |
Given: Number of Units Wasted: 140 Units Average Speed: 15 Units/min Computation: = 140 Units / 15 Units/min = 9.33 min = 0.155 hrs |
| Number of Units Wasted = Weight of Waste / Target Weight |
Given: Weight of Waste: 70 Kg Target Weight: 0.5 Kg/Unit Computation: = 70 Kg / 0.5 Kg/Unit = 140 Units |