The study of the body motions employed in performing a job to develop the most EFFICIENT work method
How to develop the MOST EFFICIENT Work Method
1. Eliminate Unnecessary Motions 2. Simplify Necessary Motions 3. Facilitate and Speed Up Effective Motions 4. Adopt Most Favorable Motion Sequence
Researchers' Work
Description
Establish Motion Elements
Established via observations
movement principles
Therbligs (Motion Elements)
1. Search - Bad 2. Select - Bad 3. Grasp - One hand 4. Reach - empty handed 5. Move - with load 6. Hold - two hands 7. Release 8. Position 9. Pre-Position 10. Inspect 11. Assemble 12. Disassemble 13. Use 14. Unavoidable Delay 15. Avoidable Delay 16 Plan 17. Rest to Overcome Fatigue
Engineers' Work
AKA "Job Analysts' Work"
Principles of Motion Economy
Description
The Use of Body
Use of both hands
Symmetric or Simultaneous arm motions
Continuous Motions
Lowest Classification (ex. fingers if you only need to use fingers)
Use momentum to your advantage
Feet/Pedals NOT efficient if you are STANDING
Arrangement of Conditions and Workplace
Definite Locations of tools to avoid search and select
Locate tools in normal working area
Use of gravity feed bins, drop delivery, automatic ejector
Located in order of use (aka sequence of motion)
Smooth rhythm
Proper illumination, ventilation and temperature
Design of Tools and Equipment
Parts held in position by fixtures
Tools/Materials should be pre-positioned
Get best possible mechanical advantage and strongest available muscle group