1
Determination of Segment Lengths and Frequencies of Pulling and Pushing of a Transport Means
The segment lengths for pulling or pushing a manual transport can be determined in different ways. Each segment describes a section between two stops where a means of transport has been pushed or pulled. The frequency can be used to determine the number of starts/stops and the length of the segment provides information on the distance travelled in time.
A
Motion-Mining®
Within a Motion-Mining® project, segment lengths and activity frequencies can be determined for a process.
B
Process Observation and Time Recording
During process monitoring, segment lengths and frequencies can be recorded using a stopwatch or app.
2
Determine the Distance per Segment
For each segment, the speed for pulling and pushing can be used to determine the distance covered in the segment (for speed, see Methods-Time Measurement (MTM) times).
3
Determining the Target Time per Segment
The next step is to define the speed at which employees will move after optimization. For unaided walking, an average of 4.5 km/h can be assumed. Accordingly, for each segment it can be calculated how long it would take in the optimizsed case to cover the distance calculated in step 2.
It is also necessary to determine how long a start/stop will take in the optimized case. For example, it must be taken into account whether a vehicle has to be exited in the process or not.
4
Calculation of the Difference per Segment
For each segment, it is now possible to calculate how long it would take in the optimized case. This is done by first subtracting the target time from the actual time for each segment. Then the time per segment is multiplied by the frequency. Similarly, the actual/target difference is added to the time per start/stop multiplied by the frequency of a segment.
5
RoI Calculation
To calculate the RoI, the differences for all segments are first added together. This savings potential per day and person is then extrapolated to the number of employees and working days per year. This is compared to the cost of the measure.
