Advantages of the MTM methods compared to other time-determining techniques
- Working methods and set-up times can be defined in detail as early as the planning phase, i.e. before the start of production (SOP). The production steps and work content can be coordinated in advance for each workplace.
- MTM forces the work planner to lay down the work method in detail for a pure time determination. Critical consideration of the method developed makes it possible to determine the best method as early as the planning phase, under the given circumstances. This leads to better qualified employees.
- This leads to the principle of work process planning using MTM methods
“Instead of reducing costs by improving work processes afterwards,
cost avoidance occurs through prior work process planning”.
- The uniforming coding of movement elements leads to an international, unambiguous, reproducible description of the work process, which is important for the construction of planning times.
- Due to the elimination of the pace estimation required for chronometer recordings, a greater guarantee is given for time standards at a uniform performance level.
- When setting up time planning, the required influence factors calculations are not required when determining the time with the data acquisition system, because the MTM time standards have already been drawn up with the relevant influence factors.
- A computer-assisted application enables fast, reproducible development and management of time building blocks. This enables immediate adjustments to changes or new processes, so the planning is easy to keep up to date.
- The detailed method description can be used when instructing employees. This keeps the schooling to a minimum.
- The application of the MTM methods makes it possible to introduce performance-related rewards. In case of objections, this leads to a more objective discussion, method oriented.
- Working methods are always reproducible, because the precise working process is defined.
- The combination of MTM and the Lean concept has been successful in avoiding waste.
- MTM is also an excellent tool for Value Stream Mapping (VSM).
MTM of performance level
MTM (published in 1948) is a PTS (Predetermined Time System) system, developed by Maynard, Stegemerten and Schwab of Methods Engineering Council Pittsburg US. In determining the performance level MTM-1 the LMS system, developed by Lowry, Maynard and Stegemerten (Westinghouse) with the following levelling factors, was used:
– skill (proficiency);
– effort (will to work);
– consistency (variability).
These factors have plus, or minus values compared to normal performance (100%). These represent a typical and average production worker with routine. The MTM-1 time values have been brought into line with LMS 100%. All MTM systems developed later are based on MTM-1 and are therefore classified at the same performance level.
Restrictions of the MTM-method
- The definition makes it clear that the MTM methods are limited to fully controllable (manual) operations. Times for processes with limited and non-influenceability are generally determined or calculated by time recordings.
- The MTM method is not applicable for intellectual (mental) actions, when more is required than yes-no decisions. This means that common thinking cannot be standardized.
- The MTM standard times do not include allowances and resting periods. These are processed using the usual methods for work and time studies.