MACHINIST

MachinistA WG- , MACHINIST:Fabricates complex and non-routine items that require numerous intricate steps, precise measurements, unusual and compound angles, or nonstandard applications of standard equipment. Performs machining work to manufacture castings, forgings, weldments, and other fabrications. May develop and manufacture specialized tools to manufacture new parts, work rare metals or special alloys, or achieve special finishes.Plans and lays out work from blueprints, sketches, drawings, or specifications. Lays out work by measuring and marking straight lines, arcs, circles, angles, and location points for setting up work pieces for drilling, tapping, turning, milling, boring, reaming, shaping, grinding, honing, and lapping. Frequently interprets or completes dimensions, tolerances, or specifications that are incomplete or incorrect. This may involve partial changes or complete redesign of items to achieve desired results. Uses a variety of measuring and marking tools, including rules, vernier calipers, micrometers (inside, outside, and depth), dial indicators, surface gauges height gauges, squares, protractors, dividers, and scribes.Performs machine setups using advanced shop mathematics, and geometric and trigonometric formulas, to compute compound angles, angular indexing, hole patterns, pitch lead, and pitch diameters for various standard and non-standard threads. Determines procedures, tools, machines, equipment, and attachments to use. Occasionally performs machine work that requires new or untried procedures. Performs special setups and improvises conventional machines to perform special machining operations. This requires special knowledges of tooling, types of coolants, machine feeds, and speeds for special operations.Sets up and operates most types of conventional and/or Computer Numerical Control (CNC) machine tools such as lathes; vertical and horizontal boring mills; bench, plane, or universal milling machines; shapers and planers; internal and external grinders, thread grinders; and radial drills. Grinds and sharpens tools, selects tools, jigs, and fixtures required to achieve specific dimensions, tolerances, and surface finishes. Sets up work in vises and between centers, uses chucks, standard faceplates, angle plate mountings, and collets. Uses mandrel and various other machine tool attachments such as rotary vises, dividing heads, taper attachments, magnetic checks, vertical milling heads, tapping attachments, and rotary tables. Adjusts and sets speeds and feeds of machinery and determines coolants, lubricants, and abrasives to be used, taking into consideration the characteristics of both the machinery and the materials to be worked. Operates machine tools to cut, drill, bore, tap, ream, shape, turn, mill, grind, hone, and lap items. Maintains dimensional accuracy during machining processes frequently, machining to tolerances that are difficult to attain or hold.Performs precision handwork to finish, fit, and assemble machined parts. Uses various bench-mounted and hand-held powered and non-powered tools such as files, drills, reamers, and buffers. Performs heat-treating, welding, and soldering.Other duties as assigned.