Holes and Hole Notes PowerPoint Presentation, PPT - DocSlides

Download stefany-barnette | 2017-10-12 | General © 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. ID: 595313

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Prior to THRU may appear an LH for Left Hand thread

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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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