Operation Charts to use in industrial areas, Lecture notes of Time and Motion Studies

Download Operation Charts to use in industrial areas and more Lecture notes Time and Motion Studies in PDF only on Docsity!

WORK ANALYSIS & DESIGN

PROCESS AND

OPERATION

ANALYSIS TOOLS

ASSEMBLY CHART

 It is an analog model of the assembly process

 Circles with a single link denote basic components

 Circles with several links denote assembly

operations/subassemblies

 Squares represent inspection operations

 The easiest method to constructing an assembly

chart is to begin with the original product and to

trace the product disassembly back to its basic

components.

EXCERCISE #1:

Construct the assembly diagram for the paper towel shelf.  Place the metal spirals into the base.  Place screw into the short stick.  Assemble the short stick in the base.  Inspect the base.  Place the screws in the long stick axis.  Place metal spiral into the spherical piece to fit the screw of the long stick.  Assemble the spherical piece to the long stick.  Assemble the long stick to the base.  Inspect the finished product.  Pack the product.

 Two symbols are used in constructing the operation process chart: a small circle denoting operation and a small square denoting an inspection.  An operation takes place when a part being studied is intentionally transformed or when it is being studied or planned prior to productive work being performed on it.  An inspection takes place when the part is being examined to determine its conformity to a standard.

11  Additional information may include such items as the chart number, plant, building, and department  Vertical lines indicate the general flow of the process as work is accomplished, while horizontal lines feeding into the vertical indicate material, either purchased or worked on during the process  Parts are shown as entering a vertical line for assembly or leaving a vertical line for disassembly  Materials that are disassembled or extracted are represented by horizontal material lines drawn to the right of the vertical flow line

 The construction of the chart inevitably suggests possibilities for improvement  The operation process chart indicates the general flow of all components in a product, and since each step is shown in its proper chronological sequence, the chart in itself is an ideal plant layout.  Consequently, methods analysts, plant layout engineers, and persons in related fields find this tool extremely helpful in developing layouts and improving existing ones.

 The operation process chart is also an aid in promoting and explaining a proposed method. Since it gives so much information so clearly, it provides an ideal comparison between two competing solutions. This important tool:

1. Identifies all operations, inspections, materials, moves, storages, and delays involved in making a part or completing a process
2. Shows all events in correct sequence
3. Clearly show the relationship between parts and fabrication complexity
4. Distinguishes between produced and purchased parts
5. Provides information on the number of employees utilized and the time required to perform each operation and inspection.

EXERCISE #2:

 Manufacture each piece of wood cylinders (cut,

winch (turn the pieces that require it), drill, sand, and

varnish).

 Drill a hole in the base to place metal spirals.

 Drill axis wood holes to tight the screws.

 Drill holes in the wood stick to tight the screw.

 Drill a hole in the spherical piece to place metal

spiral.

 Assemble and inspect the product according to the

assembly diagram.