Holes and Hole Notes PowerPoint Presentation, PPT - DocSlides

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Holes and Hole Notes PowerPoint Presentation, PPT - DocSlides - © 2012 Project Lead The Way, Inc.. Introduction to Engineering Design. Hole Definitions. Through/Thru. Hole cuts through entire thickness. Clearance. Hole large enough to allow screw head (and driver) to pass through.

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Holes and Hole Notes PowerPoint Presentation, PPT - DocSlides

    Slide1

    Holes and Hole Notes

    © 2012 Project Lead The Way, Inc.

    Introduction to Engineering Design

    Slide2

    Hole Definitions

    Through/ThruHole cuts through entire thicknessClearanceHole large enough to allow screw head (and driver) to pass throughBlindHole does not cut through entire thickness

    Slide3

    Hole Definitions

    Countersink

    Conical-shaped recess around hole at surfaceOften used to accept tapered screwCounterboreCylindrical recess around hole at surfaceOften used to receive a bolt head or nutTappedHole has internal threads

    Slide4

    Hole Note Symbols

    Slide5

    Hole Notes

    A

    0.25” diameter blind hole is drilled 0.75” deep. Then a 0.38” diameter counter bore is drilled 0.25” deep.

    Counterbore

    or Spotface symbol

    Depth

    symbol

    Slide6

    Hole Notes

    A

    0.38” diameter blind hole is drilled 0.50” deep.

    Slide7

    Hole Notes

    A

    0.38” diameter hole is drilled completely through the object.

    Slide8

    Hole Notes

    A

    0.50”

    diameter hole is drilled completely through the object. Then a countersink is created with a 1.00” diameter at the surface and tapering at 82º.

    Countersink or symbol

    Slide9

    Thread Notes

    Thread are dimensioned with the use of local notes.Two methodsUnified National Thread methodISO

    Slide10

    Unified National Thread Notes

    Thread per Inch

    Major Diameter

    Coarse or Fine threads. In this case C for course, F is for fine

    .

    Slide11

    ISO Thread Notes

    M for Metric

    12, Nominal Diameter in mm

    1.5, Pitch of the threads

    6, Grade of tolerance in the threads. Can be whole number from 3 to 9.

    H, allowance. H means no allowance, G means tight allowance.

    Prior to THRU may appear an LH for Left Hand thread

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