Repair and maintenance of pneumatic and electric tools and machine tools
A drill or drill motor is a tool fitted with a rotating cutting tool, usually a drill bit, used for drilling holes in various materials. The cutting tool is gripped by a chuck at one end of the drill and rotated while pressed against the target material. The tip of the cutting tool does the work of cutting into the target material. This may be slicing off thin shavings (twist drills or auger bits), grinding off small particles (oil drilling), crushing and removing pieces of the workpiece (SDS masonry drill), countersinking, counterboring, or other operations.
Drills are commonly used in woodworking, metalworking, construction and most "do it yourself" projects. Specially designed drills are also used in medicine, space missions and other applications.
Use of a cordless drill in assembling a book case
Drill scheme
First fix and second fix are terms used in the UK housebuilding industry.
First fix comprises all the work needed to take a building from foundation to putting plaster on the internal walls. This includes constructing walls, floors and ceilings, and inserting cables for electrical supply and pipes for water supply.
Second fix comprises all the work after the plastering to a finished house. Electrical fixtures are connected to the cables, sinks and baths connected to the pipes, and doors fitted into doorframes. Second fix work requires a neater finish than first fix.
The division of work is a convenient description because electricians, plumbers and carpenters will probably have to make two separate visits to one property under construction, at separate times. Project managers can report "first fix complete" or "second fix 50% done" and others can understand.
Some construction companies specialise in first fix work or second fix work, but most do both.
Electrical installations can be further divided into first, second and third fixes:
Russel, Jack.The Streetwise Subbie: How to Survive the Contracts Jungle,Elsevier Ltd, ISBN 13: 0 7506 8061 5 App. 4
First Fix: Positioning and securing of accessory boxes
Second Fix: Preparation and positioning of cables
Third Fix: Termination of conductors to accessories and protective devices
Retrieved from "http://en.wikipedia.org/wiki/First_fix_and_second_fix"
A tire (in American English and Canadian English) or tyre (in British English, Australian English and others) is a ring-shaped covering that fits around a wheel rim to protect it and enable better vehicle performance by providing a flexible cushion that absorbs shock while keeping the wheel in close contact with the ground. The word itself may be derived from the word "tie," which refers to the outer steel ring part of a wooden cart wheel that ties the wood segments together (see Etymology below).
The fundamental materials of modern tires are synthetic rubber, natural rubber, fabric, and wire, along with other compound chemicals. They consist of a tread and a body. The tread provides traction while the body ensures support. Before rubber was invented, the first versions of tires were simply bands of metal that fitted around wooden wheels in order to prevent wear and tear. Today, the vast majority of tires are pneumatic, comprising a doughnut-shaped body of cords and wires encased in rubber and generally filled with compressed air to form an inflatable cushion. Pneumatic tires are used on many types of vehicles, such as bicycles, motorcycles, cars, trucks, earthmovers, and aircraft.
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Repair and maintenance of pneumatic and electric tools and machine tools