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Chapter 6A Facility Layout 2.

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1 Chapter 6A Facility Layout 2

2 Layout Decisions Facility layout: the process of determining placement of departments, workgroups within departments, workstations, machines, and stock-holding points within a facility This process requires the following inputs: Specification of the objectives used to evaluate the design Estimates of product or service demand Processing requirements Space requirements for the elements Space availability within the facility LO 1 3

3 Basic Production Layout Formats
Workcenter (job-shop or functional layout) Similar equipment are grouped together Assembly Line (flow-shop layout) Work processes are arranged according to the steps by which the product is made Manufacturing cell Groups dissimilar machines to work on similar products Project layout Product remains at one location LO 1 4

4 Given Determine Workcenters
The flow (number of moves) to and from all departments The cost of moving from one department to another The existing or planned physical layout of the plant Determine The “best” locations for each department, where best means maximizing flow, which minimizing costs LO 2 6

5 Systematic Layout Planning
Numerical flow of items between workcenters Can be impractical to obtain Does not account for the qualitative factors that may be crucial to the placement decision Systematic layout planning Accounts for the importance of having each department located next to every other department Is also guided by trial and error Switching workcenters then checking the results of the “closeness” score LO 2 9

6 Example: Systematic Layout Planning for a Floor of a Department Store

7 Assembly Line Assembly line: progressive assembly linked by some material handling device Some form of pacing is present and the allowable processing time is equivalent for all workstations Important differences: Material handling devices Line configuration Pacing Product mix Workstation characteristics Length LO 2

8 Assemble Line Design Workstation cycle time: a uniform time interval in which a moving conveyor passes a series of workstations Also the time between successive units coming off the line Assembly-line balancing: assigning all tasks to a series of workstations so that each workstation has no more than can be done in the work station cycle time Precedence relationship: the order in which tasks must be performed in the assembly process LO 2

9 Assembly Line Balancing
Specify the sequential relationships among tasks Determine the required workstation cycle time Determine the theoretical minimum number of workstations Select a primary and secondary assignment rule Assign tasks Evaluate the efficiency of the balance Rebalance if needed LO 2

10 Assembly Line Balancing Formula
LO 2

11 Flexible Line Layouts LO 2

12 Developing a Manufacturing Cell
Grouping parts into families that follow a common sequence of steps Identifying dominant flow patterns of parts families as a bases for location of processes Physically grouping machines and processes into cells LO 2

13 Manufacturing Cell Benefits
Better human relations Improved operator expertise Less in-process inventory and material handling Faster production setup LO 2 34

14 Project Layout Characterized by a relatively low number of production units Visualize the product as the hub of a wheel with materials and equipment arranged concentrically around the production point A high degree of task ordering is common To the extent that this precedence determines production stages, a project layout might be developed by arranging materials according to their technological priority LO 2

15 Goal--maximize net profit per square foot of floor space Servicescapes
Retail Service Layout Goal--maximize net profit per square foot of floor space Servicescapes Ambient conditions Background characteristics, such as noise Spatial layout and functionality Planning the circulation path of customers and grouping merchandise Signs, symbols, and artifacts Parts of the service that have social significance LO 3 37

16 More open offices Low divider walls
Office Layout More open offices Low divider walls Size and orientation of desks indicates importance of people behind them LO 3

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