A machinist is a person who uses machine tools to make or modify parts, primarily metal parts, a process known as machining. This is accomplished by using machine tools to cut away excess material much as a woodcarver cuts away excess wood to produce his work. In addition to metal, the parts may be made of many other kinds of materials, such as plastic or wood products. The goal of these cutting operations is to produce a part that conforms to a set of specifications, usually in the form of engineering drawings commonly known as blueprints.
[edit] Related occupational titles
Within the title machinist are other specialty titles that refer to specific skills that may be more highly developed to meet the needs of a particular job position. Some examples of these specialty titles are fitter, turning hand, mill hand, and grinder. Also, there are titles that are related but actually are a further development of machinist skills such as tool and die maker, tool maker, trim die maker, die sinker, patternmaker and mold maker. These latter titles are also more commonly found in specialized areas of industry.
A fitter and turner refers to a person who manufactures mechanical parts (turner) and assembles (fitter) those parts together to manufacture a mechanical device.
[edit] The role of the machinist in manufacturing
A machinist is usually called upon when a part needs to be produced from a material by cutting. Such a part may be unique or may be needed in the thousands. This could include a machinery part for a production line or generally anything that can be made from metal or plastic. Producing a part will often require several steps and more than one machine tool. Each machine tool is designed to play a specific role in cutting away excess material. When large numbers of parts are needed, production planning is required to map out the most logical route using primarily computer numerically controlled (CNC) machines.
CNC machines are becoming the standard due to their speed, precision, flexibility, and reduced downtime while changing jobs. Production runs consisting of large numbers of parts are more cost effective (in a local and narrow sense) and commonly referred to as production work in the trade. Conversely, small production runs are sometimes referred to as prototype or jobbing work although with the advent of theory of constraints and lean manufacturing, this perspective may be changing.
Production engineers use blueprints and engineering drawings to produce detailed specifications of the part, especially its geometry (shape), then decide on a strategy to make it. Machine tools are then configured by the machinist or toolsetter and production commences. The machinist works closely with the quality department in order to insure the original specifications are maintained in the part produced.
[edit] Materials commonly encountered by machinists
A machinist is to metal as a carpenter is to wood. The most common materials that machinists make parts from are steel, aluminum, brass, copper, and various alloys of these materials. Other less common materials such as vanadium, zinc, lead, or manganese are often used as alloying elements for the most common materials. Materials that machinists work with occasionally are various plastics, rubber, glass, and wood products. Rarely, machinists also work with exotic and refractory metals. The term exotic metals is a general term describing out of the ordinary, rare or special purpose metals. A synonym might be space-age. A list of exotic metals might include, but is not limited to, titanium, beryllium, vanadium, chromium, molybdenum and tungsten, as well as special high-temperature metal alloys like Inconel (sometimes called superalloys). Very often the meaning of the term suggests the need for specialized handling and/or tooling in order to be able to machine them effectively.
While the foregoing were primarily the materials that a machinist would be cutting, the cutters that the machinist uses must be harder and tougher than the materials to be cut. The materials in the cutters a machinist uses are most commonly high speed steel, tungsten carbide, ceramics, Borazon, and diamond.
Machinists usually work to very small tolerances, usually within 0.010" or 0.25mm (more commonly expressed as +/-.005" or +/-0.13mm) , and sometimes at tolerances as low as 0.0001" (0.0025 mm) for specialty operations. A machinist deals with all facets of shaping, cutting and some aspects of forming metal, except for welding, which is typically a separate trade. The operations most commonly performed by machinists are milling, drilling, turning, and grinding. There are other more specialized operations that a machinist will less frequently be called upon to perform such as honing, keyseating, lapping, and polishing, to name a few.
[edit] Tools of the machinist
The tools that a machinist is expected to be proficient with fall into 6 broad categories:
- Measuring tools: The measuring tools come several basic varieties:
- Comparison tools such as adjustable parallels and plain calipers,
- Direct reading tools such as rules, scales, and vernier calipers,
- Micrometer tools based on screw threads,
- Indicator tools based on clockwork gear movements,
- Electronic measuring tools based on tranducers. Many of these are digital versions of their mechanical predecessors, as with a digital caliper.
- Hand tools: The hand tools are the usual complement of tools found in a complete auto mechanic's set except that auto specialty tools would be absent and some outsized tools would likely be present, such as 1 1/2" (38mm) open end wrench.
- Machine tools: The machine tools have undergone a dramatic shift in the last 20 years. Manual machines have given way to Computer Numerically Controlled Machines (CNCs). For clarity's sake a categorization based on the historical groupings will be offered. Each of these groupings has been altered by the advent of CNCs and the CNCs meld some groups and blur the lines between others. In the past, the most common machine tools fall into 4 categories:
- Workholders: The workholders may include vises, chucks, indexing accessories, pallets, specialty jigs or fixtures, and faceplates
- Toolholders: The toolholders may include chucks, cutter adapters, cutter extension, tool posts, indexable turrets, box tools, quick change adapters, arbors, and collets.
- Cutting tools: Cutting tools include various milling cutters such as face mills, shell mills, endmills, and form cutters; various drills, reamers, taps, countersinks, counterbores, and core drills; various turning tools, form tools, and threading tools; various grinding wheels distinguished by their geometry, bond, grit size, and compound.
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