CH 14 Flashcards
JIT
Production system in which processing, and movement of parts/modules/work-in-process occur just as they are needed, usually in small batches
Big JIT
philosophy of waste reduction and
continuous improvement = lean production
Goals of lean production
- eliminate disruptions
- make system flexible
- eliminate waste
- continuous improvement (Kaizen)
The ultimate goal is a balanced system.
smooth, rapid flow of materials through the system
JIT/Lean System Sources of Waste
- Overproduction
- Over processing
- Product defects
- Unnecessary transportation
- unnecessary inventory
- inefficient work methods
- waiting time
employee underutilization
Kaizen (continuous improvement)
- improvement to be done gradually and continuously
- everyone should be involved
- Does not require huge sums of money
- can be applied anywhere
- learn by doing
- rely on observation, data, and scientific thinking
Balanced system
Workload distributed evenly among workstations
Takt time = net available time / daily demand
Production flexibility
- reduce changeover (=set-up time
- cross-train workers
- use many small machines
- safety stocks
- keep some idle capacity
Small Lot Sizes
- less WIP inventory
- less rework and inspection
- more system flexibility
SMED
Single-minute exchange of die
System for reducing change over time
Make set-up activities external where possible (does not require stopping the machiine)