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Job Description:

  • 1) Casts and finishes plaster patterns used in making precision sand molds for dies, tools, and machine parts, according to specifications: Constructs boxlike enclosure around part to be cast, filling in cracks and openings with clay.

  • 2) Lubricates surface with parting agent that prevents plaster from sticking to part.

  • 3) Mixes plaster and pours it into enclosure.

  • 4) Reinforces plaster with hemp fiber and small steel rods or heavy wire.

  • 5) Removes hardened plaster cast from enclosure.

  • 6) Patches broken edges and fractures, using clay or plaster.

  • 7) Trims plaster pattern to tolerance by scraping and shaping plaster surfaces by hand following blueprint, using flat metal scrapers.

  • 8) Verifies dimensions, using measuring instruments, such as calipers, vernier gauge, and protractor.

  • 9) Makes identifying marks on pattern with crayon, inked rubber stamps, or pointed tool.

  • 10) Shellacs finished surfaces to harden and smooth them.




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End Of Job Description for: "PLASTER-PATTERN CASTER"
DOT:   777.381-038

Job Number: 7554