Methods Time Measurement (MTM)

Methods Time Measurement (MTM) is a predetermined motion time system (PMTS) used in industrial engineering to analyze manual tasks and predict the time required to perform them. By breaking down work into basic human motions, MTM provides a standardized way to calculate the efficiency of manufacturing processes, optimize workflows, and establish fair labor standards.

The Core Concept of MTM

MTM is based on the principle that any manual task can be decomposed into a sequence of fundamental motions. Each of these motions is assigned a time value based on the nature of the movement, the distance traveled, and the conditions under which it is performed. These time values are expressed in Time Measurement Units (TMUs), where one TMU is equal to 0.00001 hours, or 0.036 seconds.

Basic Motion Elements

The MTM system identifies several fundamental motions that serve as the building blocks of manual work. These include:

• Reach: The movement of the hand to a destination. The time required depends on the distance and the nature of the object (e.g., whether it is in a fixed location or floating).
• Move: The movement of the hand while carrying an object.
• Grasp: The act of gaining control over an object.
• Position: Aligning, orienting, and engaging one object with another.
• Release: The process of letting go of an object.
• Disengage: Breaking the contact between two objects.
• Turn: Rotating the hand or wrist.

Advantages of Using MTM

Implementing MTM provides several distinct advantages for organizations seeking to improve productivity and lean operations:

• Consistency: Unlike traditional stopwatch time studies, which can be subjective based on the speed of the worker being observed, MTM provides a consistent, analytical approach to time estimation.
• Pre-Production Planning: MTM can be used to plan work methods before a product is even manufactured. This allows engineers to design efficient processes from the start.
• Method Improvement: By analyzing the individual motions required, engineers can identify "wasteful" movements, such as excessive reaching or awkward grasping, and redesign the workstation for better ergonomics and efficiency.
• Standardization: MTM creates a common language for industrial engineers, making it easier to compare performance across different shifts, departments, or geographical locations.

MTM and Ergonomics

A significant benefit of MTM is its relationship with ergonomics. Because the system focuses on the physical mechanics of movement, it naturally highlights inefficient or physically demanding tasks. By reducing the number of complex motions or the distance required for a reach, MTM practitioners not only improve the speed of the process but also reduce the risk of repetitive strain injuries and worker fatigue.

The Evolution of MTM

Since its inception in the late 1940s, MTM has evolved to meet the needs of diverse industries. Various versions of the system exist today, including MTM-1 (the most detailed), MTM-2, and MTM-UAS (Universal Analyzing System). These variations allow companies to choose a level of precision that matches their specific needsranging from highly granular analysis for short-cycle high-volume production to faster, macro-level analysis for more complex assembly tasks.

Conclusion

Methods Time Measurement remains one of the most powerful tools in the industrial engineers toolkit. By focusing on the fundamental components of human motion, it enables organizations to quantify work with high precision, foster a culture of continuous improvement, and create environments where work is performed both efficiently and ergonomically. As industries continue to embrace automation and lean principles, the foundational insights provided by MTM ensure that human-led processes remain optimized and competitive.