Sets up and operates conventional and special-purpose machines to fabricate metallic and nonmetallic parts, and fits and assembles machined parts into complete units.
Selects, aligns, and secures holding fixtures, cutting tools, attachments, accessories, and materials on machines, such as mills, lathes, jig borers, grinders and shapers.
Calculates and sets controls to regulate machining factors, such as speed, feed, coolant flow, and depth and angle of cut.
Starts and observes machine operation to detect malfunctions or out-of-tolerance machining and adjusts machine controls or control media as required.
Verifies conformance or finished work piece to specifications using precision measuring instruments.
Set up and operates machine on trial run to verify accuracy of machine settings.
Fits and assemble parts into complete assembly, using jigs, fixtures, surface plate, surface table, hand tools and power tools.
Verifies dimensions and alignment of assembly using measuring instruments, such as micrometers, height gauges, and gauge blocks.
May install machined replacement parts in mechanisms, machines and equipment and test operation of unit to ensure functionality and performance.
Knowledge of machine shop theory and procedures, shop mathematics, machinability of materials and layout techniques.
Blueprint reading, sketches, drawing, manuals, specifications or sample part to determine dimensions and tolerance of finished work piece, sequence of operations and setup requirements. Measures, marks, scribes dimensions and reference points on material or work piece as guides for subsequent machining.
Category: Inside Machinist
NOTE: The following description is a GENERAL Overview of this career and not a description of a particular job posting.
A shipyard Inside Machinist uses various machine tools (including lathes, milling machines, drill presses, and spindles) to produce precision metal parts in large quantities. Inside Machinists must carefully plan and prepare using blueprints or written specifications to calculate operations such as where to cut or bore into work pieces, how fast to feed metal into machines, how much metal to remove from work pieces, etc.. Many Inside Machinists use Computer Numerically Controlled (CNC) cutting machines and precision measuring tools (such as inside/outside micrometers, venier calipers, dial indicators, depth micrometers, inside/outside calipers and thread gauges).
Some machining practices include:
- General turning and boring of parts on a lathe
- Thread cutting and tapping
- Taper turning
- Keyway cutting
- Laying out bolt circles to drill holes.
Most inside machinist careers require training in vocational schools, related on-the-job experience, and/or an associate's degree.
Inside machinists usually need one or two years of on-the-job experience and informal training with experienced workers. A recognized apprenticeship program may be available.
Previous work-related skill, knowledge, or experience is typically required. Inside Machinists frequently work with computer-control programs, and therefore must have the ability to determine how automated equipment will cut a part. All Inside Machinists and will need a thorough knowledge of math, including trigonometry.