WORK PROCESS
MACHINIST
O*NET/SOC CODE: 51-4041.00 RAPIDS CODE: 0296
Description: Sets up and operates conventional, special-purpose, and numerical control (NC) machines and machining centers to fabricate metallic and nonmetallic parts, and fits and assembles machined parts into complete units, applying knowledge of machine shop theory and procedures, shop mathematics, machinability of materials, and layout techniques: Studies blueprints, sketches, drawings, manuals, specifications, or sample part to determine dimensions and tolerances of finished workpiece, sequence of operations, and setup requirements. Measures, marks, and scribes dimensions and reference points on material or workpiece as guides for subsequent machining. 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, or enters commands to retrieve, input, or edit computerized machine control media. Starts and observes machine operation to detect malfunctions or out-of-tolerance machining, and adjusts machine controls or control media as required. Verifies conformance of finished workpiece to specifications, using precision measuring instruments. Sets up and operates machine on trial run to verify accuracy of machine settings or programmed control data. Fits and assembles parts into complete assembly, using jigs, fixtures, surface plate, surface table, handtools, 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. May operate welding equipment to cut or weld parts. May develop specifications from general description and draw sketch of part or product to be fabricated. May confer with engineers, production personnel, programmers, or others to resolve machining or assembly problems.
ON-THE-JOB TRAINING:
APPROXIMATE HOURS
A. TOOL CRIB
500
1. Learning names of raw materials and names and use of tools, jigs, fixtures and gauges.
B. DRILLS
500
1. Power and radial drilling, tapping, ream-lapping, counterboring and countersinking, grinding drills, lubricants, cutting, speeds and feeds, safety.
C. LATHE – ENGINE
1500
1. Chucking, use of face plate, mandrel, steady rest and follow rest, centering, straight turning, facing taper, turning with taper attachment, offset tail stock and compound, drilling, reaming.
D. MILLING MACHINE
1000
1. Plain, vertical and universal. Selection of cutters, methods of holding work, vise, clamps, dividing head, circular table – plain or slab, milling, sawing, boring, fly cutter milling, vertical head, keyway cutting, slotting, spline milling, rack cutting, cutter milling, gear cutting, gang milling, form milling, speeds and feed, lubricants, safety.
E. SHAPER AND PLANER
500
1. Methods of holding work, vise, clamps, dividing head,
surface and angle cutting, keyway cutting, squaring,
dovetailing, speeds and feeds, grinding tools, safety.
F. SURFACE GRINDER
300
1. Safety, selection of grinding wheels, speeds and feeds, mounting wheels, magnetic chuck, dressing wheels, plain or surface grinding, angle grinding, squaring.
G. UNIVERSAL GRINDER
500
1. Safety, mounting wheels, speeds and feeds, dressing wheels, straight, taper, angle face, form and hole grinding.
H. CUTTER GRINDER
600
1. Safety, mounting wheels, setting up indexing attachments, clearance angles for various types of cutters and reamers, setting up for these angles, grinding plain, spiral and end mills, reamers, form cutters.
I. HEAT TREATMENT
100
1. Kinds of steel, S.A.E. classification, how to harden, draw, case and pack harden and anneal, use of pyrometer and color chart, hardness tests, quenching baths, and safety.
J. BENCH WORK
500
1. Filing, scraping, chipping, layout and assembly, use of gauge blocks and dial indicator, vernier height gauge, lapping, tapping and threading, lubricants, inspection, safety.
K. GENERAL MACHINERY REPAIR
2000
1. Inspection and adjusting, removing and replacing broken and worn parts of machine tools, scraping bearings and ways and rebuilding machines, welding.
TOTAL HOURS
8000
Related Instruction:
- Safety
- Mathematics
- Basic Blueprint Reading and Sketching
- Tools and Equipment
- Engine Lathes
- Drives
- Air Conditioning and Air Compressors
- Drill Press
- Radial Drill Press
- Shaper
- Planer
- Farrel Wheel Borer
- Grinding Technology
- Magnaflux Unit
- Wheel Press
- Wheel Lathe
- Bench Layouts
- V Block and Clamp
- Jack Screw
- Journal Bearings
