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Basic Machine Processes

Basic Machine Processes. Objective D403.02 Explain the ANSI standards of applying annotations to a drawing that best describes the manufacturing process.. Hole Callouts Section I. . How Finish Holes Are Made. The drilling of a common drilled hole is done on a drill press.. . Drilling can also be done on a lathe..

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Basic Machine Processes

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    1. Basic Machine Processes Competency D403.00 Identify the basic concepts of the manufacturing processes.

    2. Basic Machine Processes Objective D403.02 Explain the ANSI standards of applying annotations to a drawing that best describes the manufacturing process.

    3. Hole Callouts Section I

    4. How Finish Holes Are Made The drilling of a common drilled hole is done on a drill press.

    5. Drilling Is the process used to cut a cylindrical hole with a drill press and drill bit.

    6. BORING

    7. Reaming To enlarge a hole to a more accurate size and surface quality.

    8. Specialty Tools For Hole Development

    9. ANSI Hole Identification Symbols

    10. Drill Holes - Size & Location Dimensions

    11. Dimensioning Repeated Holes

    12. Blind Hole

    13. Counterbore Callouts

    14. Through Holes

    15. Spotface Callouts

    16. Countersink Callouts Countersink – To recess a hole with a conically (cone) shaped tool to provide a seat for flat head screws. (Does not need a depth to be specified.)

    17. Knurls Section II

    18. Knurling Straight – parallel groves. Diamond – crossing diagonal groves.

    19. Knurling Dimensioning The most commonly used diametrical pitches (DP) are 64 DP (coarse), 96 DP (medium), 128 DP (fine), and 160 DP (extra fine).

    20. Chamfers Section III

    21. External Chamfers Dimensioning

    22. Internal Chamfer Dimensioning

    23. Fillets & Rounds Section IV

    24. Fillets & Rounds Sharp corners are weak. They are likely to yield cracks and other failures in the part. Fillets – are rounded inside corners. Rounds – are rounded outside corners.

    25. Fillets and rounds are normally found on cast, forged, or plastic parts.

    26. Runouts Conventional methods for representing fillets and rounds

    27. Conventional Edges If an edge has a small radius, a line should be shown. If an edge has a large radius, no line should be shown. Draw lines for edges whenever such lines make the drawing clearer.

    28. Surface Texture Symbols Section V

    29. Surface Texture Symbols Tells the machinist which surfaces are to be finished or machined.

    30. ANSI Standard Finish Mark H = Standard Letter Height For General Notes.

    31. Rules About Finish Marks Shown on the edge view of a surface to be finished. The vertex of the finish mark should point inward toward the solid metal. Position to read from the bottom of the sheet or from the right side of the sheet.

    32. Rules About Finish Marks It is repeated in every view where the surface appears as a line, including hidden lines and curved lines.

    33. Rules About Finish Marks Finish marks are not required for drill holes or any other holes where machining operations are clearly illustrated.

    34. Rules About Finish Marks If a part is to be finished all over, omit the finish marks. Letter as a general note on the drawing, such as FINISH ALL OVER or FAO.

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