Machine Parts

Therbligs : A graphical representation of the co-ordinated activities of an operators body members. These activities ar described in terms of basic or fundamental motions known as therbligs.                                         At the time Frank Gilbreth was doing his work in the field of motion study, he also concluded that any manual activity could be described in terms of 17 fundamental motions. This comparable to our being able to describe every word in the English language in terms of some of the 26 letters of the alphabet. Each of these fundamental motions is called a Therblig. Basic 17 motion name of Therblig : Name of Therblig Letter abbreviation Search Select Grasp Transport empty Transport loaded Hold Release Load Position Pre-position Inspect Assemble Disassemble Use Unavoidable    Delay Avoidable Delay Plan Rest Sh ST G

            The tiem for each therblig is recorded in the form of a chart is known as simultaneous motion cycle chart or simply simo chart.   It is drawn to a time scale the time being read from a special clock measuring town to one thousand of a minute. Purpose of Simo Chart : 1.       To analysis each therblig according to human rules of motion. 2.       To eleminate avoidable delay and to check unavoidable delay. What is basic difference between Simo Chart and Operator process chart? 1.       The basic difference beteen the two charts lies in the fact that simo chart yields a more detailed description of the observed motion pattern and hence is often than is an operator process   chart. Because of theis the analyst may be able to make improvements which would not be suggested by an analysis of an operator process chart. 2.       In Simo Chart time is recorded but in operator process chart time recording is not necessary.

Open Channel: A passage in which liquid flows with its upper surface exposed to atmosphere. In Open channels the flow is due to gravity, thus the flow conditions are greatly influenced by the slope of the channels. Difference between Open Channel Flow and Pipe Flow: 1.       Open Channel has gravity force but Pipe flows pipe runs and the flow in general takes place at the expense of hydraulic pressure. 2.       Open Channels may have any shape: triangular, rectangular, trapezoidal, parabolic and circular.Pipes are generally cross section. 3.       Varies between wide limits, the hydraulic roughness varies with depth of flow. In Pipe flow roughness co-efficient varies from a low value, depending upon the material of the pipe. 4.       In Open Channel Flow H.G.L. os coincide with the water surface but Pipe Flow is not coincide with the water surface. 5.       In Open Channel Flow maximum velocity occurrs at a little distance below the water surface

The materials which are required for the production purposes are normally procured and stored in raw materials warehouses   and they are shifted to manufacturing plants if an organization has a number of plants. Functions of Materials Managemnet: The different functions of material management are material planning, purchasing, receiving, stores, inventory control, scrap and surplus disposal. What are the advantages of materials management? The integrated materials management will result in the following advantages: a.       Adaptability to computerized system. b.       Better accountability. c.        Better performance. d.       Better coordination.

The rotatry engine has been more popularized for automobile engine. Its feature of light weight, compactness, less vibration and noise attract attention not only for automobile engines but also as prime movers in various fields. Applications: 1.       High performance motor cycle. 2.       Snow mobile. 3.       Outboard engine. 4.       Helicopter engine. 5.       General purpose engine. Small, light and portable rotary engines for generator, tire pumps, agricultures machines and so on. 6.       Industrials engines. Very large rotary engines for driving compressors and pumps. 7.       Chain sae engines. 8.       Model plane engine. 9.       Passenger cars.