1 Motion Study Motion Study • Detailed analysis of motions in operation • Developed by Gilbreths (bricklaying) • Goals: – Increase productivity – By eliminating ineffective motions – Improving (faster) effective motions • 17 fundamental motions ( therbligs)
*Motion StudyDetailed analysis of motions in operationDeveloped
by Gilbreths (bricklaying)Goals:Increase productivityBy eliminating
ineffective motionsImproving (faster) effective motions17
fundamental motions (therbligs)
IE 419*
IE 419
IE 419*
IE 419
*Two-Hand Process (Simo) Chart(Used to Analyze Motions in
Operation)
*
IE 419*
IE 419
*Therbligs & Two-Hand Process Chart
Conclusions:Basis for Predetermined Time Systems!
*Predetermined Time Systems PTS technique for obtaining a
standard time (vs. time study, work sampling) via:Analyze and
subdivide a task into elemental motions (therbligs)Assign pre-set
time values for these elementsSummate times to obtain a standard
time for whole task (no direct timing)
*History of PTSBased on Gilbreths therbligsTime added in for
each therbligFirst Work Factor in 1930sNow over 200 PTS
systemsFocus on MTM based ones
*Methods Time Measurement (MTM)Maynard, Stegemerten, Schwab in
1940sWestinghouse jobs, broken down into elements, rated, timedTime
Measurement Unit (TMU) = 0.00001 hr = 0.0006 min = 0.036 secMain
variations: tradeoff of speed & accuracy = MTM-1, 2,
3Specialized variations for jobs: MTM-C for clerical, MTM-V for
machines, MTM-M for magnification
