SMED: Streamlining the Lean Manufacturing Process

Manufacturing is a dynamic, competitive industry that relies on innovation and continuous development. For Quality Engineers, Plant Managers, and Process Improvement Leads, one critical challenge stands out. They must streamline production procedures and minimize waste during equipment changeovers. At the same time, they need to maintain compliance with quality standards such as ISO 9001 and IATF 16949.

Equipment changeover refers to switching equipment from processing one product to processing another. Changeovers adapt production schedules to customer demands. However, they can also introduce significant downtime, inefficiency, and risk to product quality. In particular, extended changeover windows often contribute to higher non-conformance rates. They also increase the cost of poor quality (COPQ). For this reason, changeover optimization is a priority concern for QA Managers and VP Quality Assurance leaders.

SMED (Single-Minute Exchange of Dies) addresses exactly this challenge. As a lean tool, SMED seeks to cut equipment changeover time to under 10 minutes. By applying SMED principles and techniques, manufacturers can reduce operational costs and improve first-pass yield (FPY). Furthermore, they increase production flexibility. Most importantly, these gains support the continuous improvement requirements embedded in frameworks like ISO 9001 and VDA 6.3.

What is SMED?

SMED stands for Single-Minute Exchange of Dies. Shigeo Shingo, a Japanese industrial engineer, created it as a lean manufacturing tool while working with Toyota in the 1950s and 1960s. Shingo observed that typical setup durations for equipment changeovers were excessively long. Consequently, they caused negative effects on output quality, irregular flow, and oversized lot sizes.

In response, Shingo proposed a methodical strategy for reducing setup times. His approach focused on eliminating unnecessary stages, streamlining labor, and standardizing processes. Additionally, he introduced the concept of internal and external setup, which we will discuss later. He also pioneered the practice of parallelizing tasks during changeovers.

SMED aims to complete as many processes as possible while the machinery is still operating. This saves time and enables a rapid switch to the next product. Notably, the phrase “single-minute” refers to changeovers that take less than 10 minutes. It does not mean they must happen in a single minute.

Moreover, SMED applies beyond manufacturing processes that use dies. Dies are specialized instruments that define a product’s size and shape. However, SMED works for any kind of process or equipment transition. In particular, it plays a valuable role in regulated environments. Quality Supervisors and Lead Auditors need to ensure changeover procedures align with FDA cGMP requirements or IATF 16949 process controls.

Why is SMED Important for Quick Changeover?

SMED helps organizations enhance their quality performance and competitiveness in several key ways:

• Reduced Downtime: SMED decreases production stoppages and increases equipment utilization. According to Shingo, the average setup time reduction using SMED methodologies is 94%. Specifically, setup times drop from 90 minutes to less than 5 minutes across a variety of enterprises. For Plant Managers and QA Managers, this frees up more time for value-added production. It also reduces the window in which quality deviations can occur.
• Increased Productivity and First-Pass Yield: Manufacturers can produce more items in less time with reduced setup times. Moreover, shorter changeovers mean fewer adjustment-related defects. As a result, first-pass yield (FPY) improves and non-conformance rates drop. Additionally, quicker setup times enable smaller lots to run more frequently. This leads to lower inventory levels and reduced storage expenses.
• Improved Flexibility: SMED enables manufacturers to react swiftly to shifting consumer needs and production schedules. They can swap from one product to another with minimal delay or waste. For Process Improvement Leads working within ISO 9001 or VDA 6.3 frameworks, this flexibility is especially valuable. It supports the ability to meet changing customer requirements without sacrificing quality controls.
• Cost Savings and Reduced COPQ: SMED delivers significant cost savings across manufacturing operations. Quicker setup periods lower labor costs because changeovers need less time and fewer resources. Furthermore, they reduce energy expenses since equipment spends less time idle. Most importantly, reduced setup times mean fewer adjustments during changeovers. Consequently, this lowers the cost of poor quality (COPQ) and improves audit readiness.

How Does SMED Work?

SMED operates by applying a set of guidelines and methods that streamline setup procedures and eliminate waste. For Quality Engineers and Lead Auditors, understanding these core principles is essential for maintaining process consistency:

Internal and External Elements

Internal setup refers to actions that can only happen when the equipment is stopped. In contrast, external setup covers tasks that workers can complete while the machinery is still running. The core goal of SMED is to convert as many internal setup processes into external ones as possible. This minimizes the time the equipment must remain idle. Furthermore, Quality Supervisors should document this classification in standardized work instructions. Doing so supports audit compliance under ISO 9001 and IATF 16949.

Identifying Waste

Waste refers to any procedure or action that does not add value to the product or service. In SMED, teams identify waste by reviewing the current setup process. Specifically, they look for phases that can be combined, omitted, moved, or simplified. For example, wasteful activities include moving materials, testing things, adjusting settings, and searching for tools. For quality teams tracking non-conformance rates, eliminating changeover waste directly improves these KPIs.

Standardization

Standardization means creating uniform processes and methods for setup tasks. It helps ensure consistency and quality while reducing variability and errors. For example, standardization includes using uniform tools, producing clear work instructions and checklists, and assigning defined roles and responsibilities. Additionally, organizations operating under FDA cGMP or IATF 16949 benefit from standardized changeover procedures. These procedures serve as controlled documents that satisfy regulatory audit requirements.

Parallelization

Parallelization means performing multiple tasks simultaneously to decrease downtime. Instead of completing tasks one after another, teams carry out several activities at the same time. They achieve this through cross-functional teams, additional personnel, and careful task synchronization. As a result, the overall changeover time drops significantly.

How to Implement SMED in Your Manufacturing Facility?

Implementing SMED requires a methodical and organized approach. QA Managers and Process Improvement Leads should coordinate closely with production teams throughout each stage. This ensures quality objectives remain central to the process:

Conducting a Setup Analysis

The first step is evaluating the current setup procedure and identifying areas for improvement. Teams observe and record the setup process. They also measure setup time and its components. Furthermore, they classify setup tasks as internal and external. They then identify sources of waste and inefficiency. Additionally, Quality Engineers should use this phase to baseline quality KPIs. These include first-pass yield (FPY), non-conformance rates, and defect frequency during changeover periods.

Brainstorming and Prioritizing

The next stage involves cross-functional teams generating ideas for cutting setup time. Teams can use brainstorming tools such as the 5 Whys, fishbone diagrams, or affinity diagrams. Moreover, they should prioritize suggestions based on feasibility, impact, cost, and risk. VP Quality Assurance leaders should ensure improvement priorities align with broader quality objectives. In particular, they must support regulatory commitments under ISO 9001 or IATF 16949.

Pilot Testing

The third phase tests and refines proposed enhancements in a controlled environment. Teams select a pilot location or piece of equipment and implement the changes. They then monitor results, gather feedback, and make adjustments as necessary. This cycle repeats until the team achieves the desired setup time. During pilot testing, Lead Auditors should verify that revised procedures remain compliant. Furthermore, teams must document corrective actions through digital systems rather than manual, paper-based processes.

Training and Continuous Improvement

The final step involves training staff on the new setup techniques and promoting ongoing improvement. Organizations can provide clear work instructions and checklists. They should also conduct regular audits and reviews. Additionally, recognizing best practices and accomplishments motivates teams. Encouraging feedback and suggestions sustains momentum. Quality Supervisors should track audit completion rates and corrective action resolution times. Consequently, this ensures improvements are sustained and documented for cross-site comparability.

How Can Certainty Software Complement Your SMED Efforts?

Certainty Software is a powerful platform for managing quality and operational processes across manufacturing facilities. For QA Managers, Plant Managers, and Quality Engineers, it addresses key pain points. Specifically, it replaces paper-based audits and eliminates the lack of cross-site comparability. Furthermore, it automates corrective action tracking:

• Digital Data Collection: Certainty Software replaces paper-based audits with mobile devices or web browsers for gathering audit and inspection data. Teams can use configurable templates or design custom forms. These forms record setup time, task classification, waste detection, and improvement suggestions. Most importantly, they maintain the documentation trail required by ISO 9001 and FDA cGMP.
• Data Analysis and Quality KPIs: Certainty Software provides dashboards and reports for analyzing audit and inspection data. Teams can track quality metrics such as first-pass yield (FPY), non-conformance rates, and audit completion rates across all sites. Additionally, they can visualize trends with a variety of filters, charts, and graphs. They can also export data to Excel or PDF for further analysis.
• Cross-Site Visibility and Collaboration: Certainty Software makes sharing audit and inspection data simple. Teams use email notifications, alerts, comments, and attachments to share findings. Furthermore, they can assign corrective actions, track resolution times, and compare SMED performance across multiple sites. As a result, this eliminates the cross-site comparability gaps that many quality organizations face.
• Data Security and Compliance: Certainty Software protects data through encryption, authentication, authorization, backup, and recovery features. Organizations control who accesses their data and how it is used. Moreover, they can store data on-premises or in the cloud. This flexibility meets the data governance requirements of IATF 16949 and FDA cGMP environments.

Conclusion

SMED is a lean tool that reduces equipment changeover time to under 10 minutes. As a result, it helps organizations streamline production processes while strengthening quality outcomes. By applying SMED principles, manufacturers can improve first-pass yield and reduce non-conformance rates. Furthermore, they lower COPQ and increase production flexibility.

However, SMED is neither a one-time endeavor nor a quick fix. It requires close attention to detail, thorough planning, and ongoing improvement. Additionally, it demands cross-functional teamwork between production, quality, and engineering teams. Quality Engineers, QA Managers, and Process Improvement Leads also need a robust platform like Certainty Software. It helps them move beyond paper-based audits and enables consistent data collection across sites.

Please get in touch with us right away for a free demo or trial if you want to learn how Certainty Software can enhance your manufacturing processes. You can also download some of our free checklists to start improving quality performance right away.