Week 5 Pull and Flow Flashcards
Flow and Pull 7 objectives
• Spaghetti charts
• Quick changeovers (SMED)
• Cellular design
• Overall equipment effectiveness
• Theory of constraints
• Pull systems and kanban signaling
• Visual workplace design
Lean 3rd principal
Create Flow
Actions that create value should occur continuously and smoothly without interruption to deliver the product or service to the customer
Inventory is evidence of non-flow
Two book suggestions
Theory of Constraints by a Gartner analyst and co-author of The Phoenix Project, George Spafford.
Third principal of LEAN
Create flow
Eliminate waste create flow.
Eliminate waste create flow.
Eliminate waste create flow.
Eliminate waste create flow.
Actions that create value should
Occur continuously and smoothly without interruption to deliver the product or service to the customer.
Topics of Flow
Spaghetti Maps
Single Minute Exchange of Die (SMED)
Cellular Design
Theory of constraints
Spaghetti maps
all steps of a persons movement
1) create map
2) observe and draw
3) analyze for improvements
SMED single minute change of dies
Sheigo shingo, Toyota, change over of dies drove lot sizes. he looked at technique to make change over faster.
SMED
Reduction in waste of waiting allows us to produce more often.
SMED 8 techniques
1) separate internal from external operations
2) convert internal to external
3) Standardize the function of holding onto parts while machining
4) use functional clamps, no screws and bolts
5) intermediate jigs; getting things into position before
6) Adopt parallel operations; pit crew at Indy
7) Eliminate adjustments (tool presetter helps)
8) Ensure mechanization, spend money on things that automate processes
SMED internal operation is
what has to happen while the machine or process is stopped
SMED external operation is
what can happen while the machine is running.
SMED implementation cycle
• Observe the process
• Separate internal from external
• Streamline internal and external activities beginning with the internal ones
• Document the new process and procedure
• Repeat the cycle
SMED, which of the 8 wastes are addressed with SMED?
All of them.
SMED, which of the 8 wastes are addressed with SMED?
All of them.
Cellular design: language water spider
water spider, someone suppling material to the cell, this is not value added.
Cellular design: language WIP
Work in process inventory, minimized in
Cellullar design: language TAKT time
customer demand of product
Cellular design: single piece flow, 4 reasons for U shape
- no corners
- materials and finished goods same entry point
- equipment grouped together
- constant motion, no waiting for machine, operator or inventory.
Cellular design: Language, 4 goals of good cellular design
- flow
- zero work in process between operations
- single piece flow not batches
- minimal transportation or motion
Work load balancing
1) observe the process (use form)
2) record time each step ends
3) do math on each step
4) look for lowest amount of time
5) look for all step time
Cycle time bar chart
After observing create bar chart for each step. Examine and change steps that do not conform to cycle time (example, 45 seconds).
Overall equipment effectiveness (OEE), 3 elements of flow:
• Availability
• Performance
• Quality
OEE availability calc
Availability = Number of Hours Running/Number of Planned Hours Running