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
Â© 2012 Project Lead The Way, Inc.
Introduction to Engineering DesignSlide2
Through/ThruHole cuts through entire thicknessClearanceHole large enough to allow screw head (and driver) to pass throughBlindHole does not cut through entire thicknessSlide3
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 threadsSlide4
Hole Note SymbolsSlide5
0.25â diameter blind hole is drilled 0.75â deep. Then a 0.38â diameter counter bore is drilled 0.25â deep.
or Spotface symbol
0.38â diameter blind hole is drilled 0.50â deep.Slide7
0.38â diameter hole is drilled completely through the object.Slide8
diameter hole is drilled completely through the object. Then a countersink is created with a 1.00â diameter at the surface and tapering at 82Âº.
Countersink or symbolSlide9
Thread are dimensioned with the use of local notes.Two methodsUnified National Thread methodISOSlide10
Unified National Thread Notes
Thread per Inch
Coarse or Fine threads. In this case C for course, F is for fine
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