SMED: Shingo's Setup Paradigm
In traditional operations, long machine setup and changeover times force manufacturers into the "Batch Size Trap": running massive batches to amortize high setup costs. This creates bloated inventory, hides defects, and drags down Process Cycle Efficiency (PCE).
SMED (Single Minute Exchange of Die), developed by Shigeo Shingo, converts changeover from a production-stopping roadblock into a streamlined, high-speed routine. The goal is to reduce changeover times to a single digit (under 10 minutes).
Current Selected Case Details
Operational Impact Targets
Step 1 Observe, Record & Manage Changeover Tasks
Map the current state changeover sequence. You can add new processes, modify step names, edit durations, specify prerequisite relationships, or check external lock status for loaded and custom cases alike.
Task Editor / Creator
| # | Task Description | Duration (min) | Initial State | Prerequisite | Constraint / Lock Status | Actions |
|---|
Initial Timeline Allocation
Layout Process Flow & Spaghetti Diagrammer
Map the physical floorplan layout and sketch the walking routes (Spaghetti Diagrams) of operators during a changeover. Minimizing walking waste releases bottleneck capacity and prevents operator fatigue.
Step 2 Separate Internal from External Tasks
Classify each task. If a task can be done while the machine is running (e.g. getting the next job, pre-heating the die, gathering tools, filling paperwork), it must be classified as **External**. This immediately removes that downtime from the machine stoppage window!
Internal Stoppage Tasks
Tasks currently stopping the machine
External Setup Tasks
Tasks done while machine is running
Separation Stage Timeline (Machine Downtime Segment)
Step 3 Convert Internal Tasks to External
Analyze the remaining internal tasks. Can they be redesigned or modified to become external? Note that tasks with **Constraints** cannot be converted to external unless we use specific interventions.
Convertible Candidates
Select a task to apply an engineering conversion intervention:
Post-Conversion Stage Timeline (Machine Downtime Segment)
Step 4 Streamline & Parallelize Setup Operations
Finally, streamline the remaining tasks. For internal tasks, replace threaded bolts with quick-action clamps (one-touch fast bolts), standardize tool heights, and introduce parallel execution (choreographed teamwork, like F1 pit crews).
Streamlining Interventions
Current State vs. Future State Schedule
SMED Performance & Capacity Calculator
Review the operational gains, capacity release, and economic leverage enabled by your SMED interventions.
Before vs. After SMED Metrics
| Parameter | Before SMED | After SMED | Improvement |
|---|---|---|---|
| Setup Changeover Time | 90 min | 8 min | -91.1% |
| Run Batch Size | 500 units | 100 units | -80.0% |
| Process Cycle Efficiency (PCE) | 0.032% | 0.150% | 4.7x Increase |
| WIP Queue Lead Time | 5.4 days | 0.2 days | -96.3% |
Step 5: Setup Diagnostic Recommendations
Generate tailored improvement guidelines based on your current setup configuration, optimization parameters, and constraints.
SMED Qualitative RAG & Troubleshooting Guide
Consult setup time reduction rules, case comparisons, and guidelines derived directly from Shigeo Shingo's classic studies.
Shingo's Setup Recommendations
Stamping & Tip Changes
Offline pre-setting with standard gauges allows changing tools and blades off the machine line. This cuts lathe turnovers from 15 minutes to under 5.
Rotatable Mounting Plates
For changing grease nozzles, keep all sizes pre-mounted on a rotatable manifold. Shifting models changes from a 12-minute replacement to a 30-second rotation.
Pit Crew Choreography
Standardize operator positions and hand signals. Use parallel crews to execute wheel switches in seconds.
The Standard Work Rule
Document pre-staged tooling locations. Pre-stages must be labeled visually so missing tools are flagged before changeover starts.