Calculating Line Changeover Costs in Shared Sub Assembly Infrastructure
Subassembly changeover costs must sum direct technician labor, idle station depreciation, downstream line starvation risks, and post-swap calibration scrap.
SMED Teardown
Meaning
Structured analysis technique used in lean manufacturing to document, dissect, and eliminate time-consuming activities during machine changeovers. A SMED teardown is conducted by filming and timing every movement of the setup crew as they transition a machine from one product run to another. It identifies unnecessary steps, awkward tool usage, and delays that can be eliminated or moved outside the downtime period.
This systematic review forms the basis of single-minute exchange of dies programs.
Workstation Analysis
Breaking down a complex equipment setup into individual tasks reveals opportunities to transition activities from internal to external stages. During a SMED teardown, observers examine the path traveled by the setup technician to retrieve wrenches or adjustment plates. If the worker must leave the machine area several times, it indicates a poor workstation layout.
Correcting these inefficiency points allows the team to reduce the time a machine spends offline.
Performance Audit
Verifying the success of the optimization program requires tracking the progress made after applying changes to the setup routine. A SMED teardown is audited by comparing the duration of the new setup sequence to the historic baseline measurements taken before the intervention. This audit ensures that the redesigned tasks are repeatable and that all shifts can achieve the same reduced changeover times.
Tool Standardization
Simplifying the physical connections on a machine helps the setup crew complete their tasks more quickly. When a SMED teardown reveals that technicians must use multiple wrenches of different sizes, standardizing the fasteners can yield immediate time savings. This mechanical simplification reduces the duration of line stoppages.