spark drilling
31fire — firer, n. /fuyeur/, n., v., fired, firing. n. 1. a state, process, or instance of combustion in which fuel or other material is ignited and combined with oxygen, giving off light, heat, and flame. 2. a burning mass of material, as on a hearth or… …
32Chuck (engineering) — Self centering three jaw chuck and key with one jaw removed and inverted showing the teeth that engage in the scroll plate. The scroll plate is rotated within the chuck body by the key, the scroll engages the teeth on the underside of the jaws… …
33Lathe center — Dead center mounted in the spindle of a lathe and being used to support a workpiece being driven by a carrier setup A lathe center, often shortened to center, is a tool that has been ground to a point as to accurately position a workpiece about… …
34Lathe (metal) — Center lathe with DRO and chuck guard. Size is 460 mm swing x 1000 mm between centers A metal lathe or metalworking lathe is a large class of lathes designed for precisely machining relatively hard materials. They were originally designed to… …
35Indexing head — and tailstock set up on a milling machine s table. An indexing head, also known as a dividing head or spiral head,[1] is a specialized tool that allows a workpiece to be circularly indexed; that is, easily and precisely rotated to preset angles… …
36Construction of the Trans-Alaska Pipeline System — The construction of the Trans Alaska Pipeline System was a massive undertaking involving tens of thousands of people often in extreme temperatures and conditions. Specialized construction techniques were pioneered to build the pipeline, most of… …
37Grinding (abrasive cutting) — Sketch of how abrasive particles in a grinding wheel remove material from a workpiece. Grinding is an abrasive machining process that uses a grinding wheel as the cutting tool. A wide variety of machines are used for grinding: Hand cranked knife… …
38Iranian Embassy siege — The Iranian Embassy, severely damaged by fire following the end of the siege Date 30 April – 5 May 1980 …
39Ask and Embla — In Norse Mythology, Ask and Embla (Old Norse: Askr ok Embla ) were the first two humans created by the gods. The pair are attested in the Poetic Edda , compiled in the 13th century from earlier traditional sources, and the Prose Edda , written in …
40Apollo 1 — Infobox Space mission mission name = Apollo 1 insignia = Apollo 1 patch.png crew size = 3 command module = CM 012 mass 20,412 kg service module = SM 012 booster = Saturn IB SA 204 launch pad = LC 34 nowrap|Cape Canaveral Florida, USA launch =… …
