Gilbreths Therbligs
Predetermined motion time systems are based to some extent on
Predetermined Motion time systems
refined by micromotion analysis and synthetic rating and you assume that work elements are independent and additive
Therbligs
set of fundamental motions required for a worker to perform a manual operation or task (search, find, select, grasp, hold,position, assemble, use, disassemble, inspect,transport loaded/unloaded, pre-position for next operation, release load, unavoidable d
Therblig
is used to in the study of motion economy in the workplace
Gilbreth
the word therblig is the reversal of this word with 'th' treated as one letter
workplace task
analyzed by recording each of the therblig units for a process
Results
used for optimzation of manual labor by eliminating unneeded movements when related to therbligs.
Standards
can be created at the desktop, based on information on the method and the workplace
Verify conditions, tooling and methods to avoid missing something
what is a major caution of Predetermined motion time studies?
Use the appropriate system according to the task, based on duration and repetition of the activity
what is a major caution of Predetermined motion time studies?
.0006 mins
Unit conversion for 1 TMU
MTM and MOST
What are some common systems PTS?
MTM-1
most detailed, and can be used for any task
MTM-2
less detailed, requiring more judgement by the analyst
MTM-3
even less detailed, and much quicker to apply, specialized version.
MOST
Maynard Operation Sequence Technique
Basic MOST
for general use
Mini-MOST
for highly repetitive tasks
Maxi-MOST
for long-cycle, non repetitive tasks
Standard Data
Collection of elemental times (normal times) that have been verified as satisfactory in use, stored in a format for easy retrieval
Elemental Times
may be put together in common tasks or motion sequences, sometimes by regression
Computerized predetermined time systems
provide for automatic or computer-aided generations of sequences and storage of indexed standards
modifying existing standard times based on applicable variables and combing elemental times for the new task
New standard times are created by
Kjell Zandin
who developed MOST?
H B Maynard
where was MOST developed?
MTM data
what was based on when developed?
Reduced analysis time
What was one of the things that MOST did?
MOST
activity-based, using frequently repeated motion sequences
Range of motions
MOST is estimated for this rather than precise measurement or estimation
paperwork
MOST requires minimal amount of what
consistent and widely accepted
MOST is ...
encourages methods improvement
What does MOST structure do
General move, Controlled move, Tool use, Manual crane sequence?
what are four main sequence models in MOST?
Win is a douche
Make sure you look over how to do the sequence model
General Move
get an object, place it and return, unrestricted path
Controlled Move
get an object, move or actuate it and return, controlled or restricted path
Tool use
get a tool, place it for use, put aside, return
General move
freely through space
Controlled move
over a restricted path
Tool Use
using a tool
Examples of General move
pick up book and place it on shelf, grasp washer put it onto a bolt, place stamp on envelope
Not general move
turn a knob, pull a lever, close book
examples of controlled move
pull a level 8 inches, push button, slide a box, push a wheeled cart, turn a knob, flip a switch
Not controlled move
rest foot on foot pedal, put a key in a lock
Examples of tool use
attach a nut on a bolt with 5 finger spins, cut open a box with a knife
Fasten/loosen and cut, surface treat, measure, record and think
What are two kinds of tool use?
General Move
ABG ABP A
Controlled move
ABG MXI A
Tool use
ABG ABP F ABP A