Figure shows the operating
principle of an external gear pump. It consists of a driving gear and a driven
gear enclosed in a closely fitted housing. The gears rotate in opposite
directions and mesh at a point in the housing between the inlet and outlet
ports. Both sets of teeth project outward from the center of the gears. As the
teeth of the two gears separate, a partial vacuum forms and draws liquid
through an inlet port into chamber A. Liquid in chamber A is trapped between
the teeth of the two gears and the housing so that it is carried through two
separate paths around to chamber B. As the teeth again mesh, they produce a
force that drives a liquid through an outlet port.
Transport is the movement of materials from one location to another, this is a waste as it adds zero value to the product. Why would your customer (or you for that matter) want to pay for an operation that adds no value? Transport adds no value to the product, you as a business are paying people to move material from one location to another, a process that only costs you money and makes nothing for you. The waste of Transport can be a very high cost to your business, you need people to operate it and equipment such as trucks or fork trucks to undertake this expensive movement of materials. Waste of transport is a consequence of excessively long, intersecting transport paths, temporary storage, load and unload, transport of pallets hither and thither. Waste of transport is also caused by too detailed process breakdown and exaggerated division of work, due to imprecisely defined intermediate warehouses and due to production in large series. Waste of tra...
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