IE 271 Exam 1

Ineffective therbligs

which do not advance the progress of the work and should be eliminated by applying the principles of motion economy Search S Select SE Position P Inspect I Plan PL Unavoidable Delay UD Avoidable Delay AD Rest R Hold H

9 Operation analysis approaches

1. Purpose of operation 2. Design of the parts 3. Tolerances 4. Materials 5. Manufacturing sequence 6. Set up and tooling 7. Materials handling 8. Layout of operations 9. Work design

Operation Process Chart

A chart listing all the processes needed to make a product. chronological Allows visualization the present method to devise a better one

Gang Process Chart

Determines economical amount of machines one worker can operate

"Each worker is given a definite task to be performed in a definite time and in a definite manner"

Frederick W. Taylor

Effective Therbligs

Reach RE Move M Grasp G Release RL Preposition PP Use U Assemble A Disassemble DA

Purpose for method analysis and work measurement

To eliminate every unnecessary operation

Factors of Productivity

Tools Methods Tasks Environment Work Organization

Worker and Machine Process Chart

Used to study analyze and improve one workstation at a time

Work Content

The amount of work contained in a product or process, in person-hrs or machine-hrs

Flow Diagram

a drawing used to analyze movement of people or material

Operation analysis

analysis takes place and the various components of the proposed method crystallize. Why?

Productivity

the effectiveness of productive effort, especially in industry, as measured in terms of the rate of output per unit of input.

Total ineffective time

-Due to management shortcomings -Factors under worker control

Motion Classification

1. Finger 2. Finger Wrist 3. Finger Wrist Lower Arm 4. Finger Wrist Lower Arm Upper Arm 5. Finger Wrist Lower Arm Upper Arm Trunk

Work Content Sources

Basic work content Excess work content from design defects Excess work content from poor methods

Flow Process Chart

Chart used to examine the overall sequence of an operation by focusing on movements of the operator or flow of materials

Questions for an operation analysis procedure

Why is this operation necessary? Why is this operation performed in this manner? Why are these tolerances so close? Why has this material been specified?