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Metrics and Measurements - IE 3343 - Final Exam
Chapters 14, 15, 16, and 18 for Dr. Boardman's Final Exam
42
Engineering
12/09/2010

Term
 PMTS (definition)
Definition
 (predetermined motion time study)database of basic motion elements and associated normal time values, together with a set of procedures for applying the data to analyze manual tasks and establish standard times for the tasks.
Term
 MTM
Definition
 methods-time measurement
Term
 PMTS Procedure
Definition
 1. Analyze work method and describe in terms of basic motions of task, based on defined workplace layout and set of tools.2. Find normal time of all motion element; sum to determine task normal time3. Evaluate method: eliminate motions, reduce distances, introduce special tools, use simultaneous right/left, etc.4. Apply allowances --> standard time
Term
 PMTS Levels/Generations
Definition
 1st level: basic motion elements>1: motion aggregates
Term
 PMT System Level Characteristics (list)
Definition
 1. Accuracy; 2. Application time; 3. Suited to specific types of tasks; 4. Cycle times; 5. Motion elements; 6. Methods description; 7. Flexibility of application;
Term
 characteristics of first-level PMTS
Definition
 1. Most accurate; 2. much time to set standard; 3. Highly repetitive; 4. Short cycle (e.g., 1 min); 5. Basic motions; 6. Very detailed; 7. Highest flexibility;
Term
 Characteristics of Higher-level PMTS
Definition
 1. Less accurate; 2. Less time to set standard; 3. Repetitive or batch; 4. Longer cycle times feasible; 5. Aggregates of basic motions; 6. Less detailed, easier to apply; 7. Less flexibility;
Term
 MOST (definition)
Definition
 (Maynard Operation Sequence Technique)High-level PMTS
Term
 SDS
Definition
 (standard data system)a database of normal time values, usu. organized by work elements, that can be used to establish time standards for tasks composed of work elements similar to those in the database.
Term
 macroscopic
Definition
 used to refer to the elements in an SDS
Term
 microscopic
Definition
 used to refer to the PMTS elements
Term
 SDS is most suited to (list)
Definition
 1) similarity in tasks; 2) batch production; 3) large number of standards to be set; 4) need to set standards before production;
Term
 coverage
Definition
 term for the family of tasks for which the SDS is applicable
Term
 steps in using an SDS
Definition
 1) Analyze the new task and divide into work elements; 2) access database to determine normal times for work elements; 3) add element normal times to obtain task normal time; 4) compute standard times for setup and production cycle;
Term
 work variables
Definition
 the various conditions and parameters that the work elements are performed under
Term
 steps in developing a SDS
Definition
 1) Define the objectives of the system; 2) Define the coverage of the system; 3) Obtain work element normal time data; 4) Classify work elements; 5) Analyze data to determine element normal times; 6) Develop database to predict normal times; 7) Prepare documentation;
Term
 work element classification in SDS
Definition
 1) setup vs production elements; 2) constant vs variable elements; 3) worker-paced vs machine elements; 4) regular vs irregular elements; 5) internal vs external elements
Term
 setup time / changeover time
Definition
 time required to change the physical arrangement of the workplace, to replace the tooling, and to reprogram/reset the equipment to get ready for the next batch.
Term
 setup elements (in an SDS)
Definition
 the activities required to accomplish changeover
Term
 production elements
Definition
 those associated with the processing of work units
Term
 constant elements
Definition
 same time value in all time studies
Term
 variable elements
Definition
 same basic motion patterns and functions with normal times that vary because of work variable values
Term
 operator-paced elements
Definition
 manual elements, either setup/production or constant/variable elements with unavoidable random variations that are characteristic of any human manual activity
Term
 machine-controlled elements
Definition
 elements that are variable, depending on operating parameters of the machine / characteristics of the work unit.
Term
 regular element
Definition
 occurs at least once every work cycle
Term
 irregular element
Definition
 less frequently than once per work cycle
Term
 turning
Definition
 machine operation in which a single point cutting tool is used to remove metal from the surface of a rotating cylindrical work piece by feeding the tool linearly in a direction parallel to the axis of rotation (performed on lathe)
Term
 cutting conditions
Definition
 cutting speed (surface speed at the original work diameter), feed (tool travel distance per revolution of the workpiece), and depth of cut below the original work surface
Term
 drilling
Definition
 machine operation that creates a round hole in a workpiece, using a rotating drill bit
Term
 twist drill
Definition
 usually drill bit for a drilling operation, used on a drill press
Term
 drill press
Definition
 machine tool used for drilling operation (with drill bit: twist drill)
Term
 drilled holes (type)
Definition
 through hole (through opposite side)blind hole (drill bit does not pass through the work
Term
 milling
Definition
 machine operation in which a rotating cutting tool with multiple cutting edges (teeth) is used to remove metal from a work part that is fed past the cutter.
Term
 milling cutter
Definition
 the "bit" used in milling, used on a milling machine
Term
 peripheral milling
Definition
 where the main cutting teeth are on the periphery of the milling cutter
Term
 face milling
Definition
 in which the cutting teeth are on the end and side of the cutter
Term
Definition
 1) productivity in setting standards (5x productivity improvement vs DTS); 2) cost savings; 3) setting standards before production; 4) avoids the need for performance rating; 5) consistency in the standards; 6) inputs to other information systems;
Term
Definition
 1) high investment cost; 2) source of data; 3) methods descriptions; 4) risk of improper applications;
Term
 work sampling
Definition
 statistical technique for determining the proportions of time spent by subjects in various defined categories of activies
Term
 situations well-suited for work sampling
Definition
 1) sufficient time available to perform the study; 2) multiple subjects; 3) long cycle times; 4) non-repetitive work cycles;
Term
 work sampling (list synonyms)
Definition
 activity sampling, occurrence sampling, ratio delay study, snap reading method
Term
 steps in conducting work sampling study
Definition
 1) Define the objective(s) of study; 2) Define the subjects to be studied; 3) Define the output measure(s); 4) Define the activity categories; 5) Design the study; 6) Identify the observers who will do the sampling; 7) Announce the study; 8) Make the observations; 9) After completing the study, analyze and present the results;
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