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?