Methods Time Measurement (MTM)

Methods Time Measurement, commonly abbreviated as MTM, is a predetermined motion time system used in industrial engineering to analyze the tasks performed in a manufacturing or service environment. By breaking down manual labor into fundamental motions and assigning a standard time value to each, companies can determine the time required to perform a specific task without needing a stopwatch for every individual cycle.

The Foundation of MTM

Developed in the late 1940s by H.B. Maynard, G.J. Stegemerten, and J.L. Lowry, MTM revolutionized work measurement. Before its inception, work measurement relied heavily on time studies, where an observer would watch a worker and record durations. MTM introduced a scientific approach based on motion analysis, allowing engineers to establish "fair day's work" standards based on the physical movements required rather than the observed speed of a specific individual.

Core Principles

MTM operates on the premise that there are basic human motions that are common to almost all manual tasks. These motions include reaching, grasping, moving, positioning, and releasing. By cataloging these motions and their respective time valuesmeasured in Time Measurement Units (TMU), where 1 TMU equals 0.00001 hoursMTM allows for the following:

• Standardization: Creating consistent work methods across different shifts and facilities.
• Method Improvement: Identifying inefficient motions and eliminating them before a process is even implemented.
• Cost Estimation: Precisely calculating labor costs for new products during the design phase.
• Ergonomic Analysis: Ensuring that the required motions are physically sustainable for the worker.

Key Motion Elements

The MTM system defines several categories of motion. Some of the most common include:

• Reach: The basic motion of moving the hand to a destination. The time for a reach is determined by distance and the type of destination (e.g., reaching for a defined object versus a general area).
• Move: The motion of transporting an object to a destination. Time is influenced by weight, distance, and the degree of control required.
• Grasp: The action of gaining control over an object. The complexity of the grasp depends on the size and location of the object.
• Position: The act of aligning or engaging one object with another.
• Release: The process of letting go of an object.

Benefits of MTM in Industry

The primary advantage of MTM is that it removes the subjectivity inherent in traditional time studies. Because the time values for motions are predetermined based on extensive research, they are not influenced by the pace of the worker being observed. This creates a more equitable performance standard.

Furthermore, MTM is highly valuable in the planning phase of manufacturing. Engineers can build an "ideal" sequence of motions for a new workstation layout and calculate the expected production rate. This proactive approach helps in designing efficient assembly lines and minimizing waste in a Lean manufacturing context.

Challenges and Considerations

While MTM is a powerful tool, it requires significant training to apply correctly. Analysts must be skilled in identifying the precise motions being used and must have a deep understanding of the MTM tables. Additionally, MTM is best suited for repetitive manual tasks. For highly creative or unpredictable roles, other forms of measurement may be more appropriate.

Conclusion

Methods Time Measurement remains a pillar of industrial engineering. By focusing on the fundamental components of human motion, organizations can achieve higher efficiency, better ergonomics, and more accurate production planning. As industries move toward greater automation and optimized human-machine collaboration, the principles of MTM continue to provide a scientific basis for understanding and improving how work is done.