Advantages of the MTM methods, in comparison to other time-determining-techniques
- Work methods and set-up and run times can be defined in detail before the start of the production. The manufacturing steps and work content can be secured at the first time.
- MTM requires the user to define the work methods in detail for a clear time determination. By critically analysing the developed methods, the best method under the given conditions, can determined while still in the planning stage. This lead to better qualified employees.
- It follows the principle of work process planning using MTM-methods:
“Cost reduction through additional work design is replaced by
Cost avoidance through prior sequence planning.”
- The uniform coding of motion elements leads to an internationally accepted, reproducible description of the work process, which is particularly important for developing planned times.
- Because of experiment of assessing the pace, necessary for chronometer recordings, a guarantee for time standards in a uniform performance level is given in bigger extent.
- When setting up the schedule for time determination, the required influence factor calculations expire during the time measurement with the chronometer, because the MTM-time standards have been drawn up already with the relevant influence factors.
- A computer-assisted application allows a fast, reproducible development and management of time building blocks possible. This makes direct adjustments to changes or new processes possible, to keep the planning up to date as simple as possible.
- Employees can be initially trained to follow the planned methods reflected in the MTM analyses, thus reducing the associated learning curve to a minimum.
- Application of the MTM method for calculating standard times makes introduction of incentive pay This leads, in case of objections, to a more objective, method oriented, discussion.
- Working methods are always reproducible, because the exact work process is documented.
- The combination of MTM and the Lean concept is successful at avoiding waste.
- MTM is also an excellent tool to, for example, Value Stream Mapping (VSM)
Level of performance level MTM
MTM (published in 1948) is a PTS (Predetermined Time System) system, developed by Maynard, Stegemerten and Schwab from the Methods Engineering Council Pittsburg US.
When the level of performance for MTM – 1 was established, they used for example the LMS system, developed by Lowry, Maynard and Stegemerten (Westinghouse), with the following levelling factors
– skill (proficiency);
– effort (will to work);
– consistency (variability).
These factors show plus or minus values relative to a normal performance (100%). These represent a typical and average production worker with routine. The MTM-1 time values are brought to an equal level with LMS 100%.
All later developed MTM-systems are based on MTM-1 and are therefore classified at the same level of performance.
Limitations of the MTM-methods
- The definition makes it clear that the MTM methods are limited to complete influenceable (manual) operations. Times for limited influenceable and not influenceable processes are generally determined by time recordings, either calculated
- The MTM-method cannot be used for mental activities when there is a desire for more than simple Yes or No decisions. Common thinking can therefore not be analysed.
- Allowances and resting periods are not included in the MTM-standard times. These are processed through the usual methods for labour-and time studies.