Download - Dimensioning Guides
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Dimensioning
Chapter 9
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5Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
-./ectives 6cont+7
$se aligned and #nidirectionaldimensioning systems
Dimension circles, arcs, andinclined s#r8aces
denti8y precision ranges 8or typical
man#8act#ring operations pply 3nish sym.ols and notes to
a draing
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(Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
-./ectives 6cont+7
Dimension conto#rs $se standard practices 8or
dimensioning prisms, cylinders,holes, c#rves
List practices 8or dimensioning a
solid model as doc#mentation denti8y g#idelines 8or the do:s and
don:ts o8 dimensioning
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)Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
$nderstanding
Dimensioning Draings 8or prod#cts m#st .e
dimensioned so that prod#ction
personnel all over the orld canmake mating parts that ill 3tproperly hen assem.led or hen
#sed to replace parts
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;Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
spects o8 Good
Dimensioning Dimensions are given in the 8orm o8
distances, angles, and notes
regardless o8 the dimensioning #nits.eing #sed
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29 !earson "d#cation, $pper Saddle %iver, N&'()*+
hen a 3nished part is meas#redit may vary slightly 8rom the e4act
dimension speci3ed
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8/65*Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Lines $sed in
Dimensioning Dimension line ? a thin, dark, solid
line terminated .y arroheads,
indicating the direction and e4tento8 a dimension
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9/659Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Lines $sed in
Dimensioning "4tension line ? a thin, dark, solid
line that e4tends 8rom a point on
the draing to hich a dimensionre8ers
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29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Lines $sed in
Dimensioning Centerline ? a
thin, dark linealternating longand short dashescommonly #sedin locating holesand othersymmetrical8eat#res
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29 !earson "d#cation, $pper Saddle %iver, N&'()*+
$sing Dimension and
"4tension Lines Shorter dimension lines are nearest
the o./ect o#tline
Dimension lines sho#ld not crosse4tension lines dimension line sho#ld never
coincide ith or e4tend any line o8
the draing void crossing dimension lines hen
possi.le
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12/65@2Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
$sing Dimension and
"4tension Lines
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29 !earson "d#cation, $pper Saddle %iver, N&'()*+
$sing Dimension and
"4tension Lines Dimensions sho#ld .e lined #p and
gro#ped together as m#ch as
possi.le
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16/65@;Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Leaders
leader is a thin solid linedirecting attention to a note or
dimension and starting ith anarrohead or dot
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Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Draing Scale and
Dimensioning Draings are #s#ally made to a scale
hich is indicated in the title .lock
heavy straight line sho#ld .edran #nder any single dimensionval#e that is not to scale 8 an entire draing is not prepared to a
standard, note N-N" in the scale area o8the title .lock
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Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Direction o8 Dimension
Aal#es and Notes ll dimension val#es and notes are
lettered hori1ontally and sho#ld
read 8rom the .ottom o8 the sheet
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Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Direction o8 Dimension
Aal#es and Notes
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Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Dimension $nits
Dimension val#es are shon #sing themetric system or decimal inch val#es
t is standard practice to omitmillimeter designations and inchmarks on draings and note the #nitsin the title .lock e4cept hen there is
a possi.ility o8 mis#nderstanding
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Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Dimension $nits
"ither meters or 8eet and inchesand 8ractional inches are #sed in
architect#ral and str#ct#ral ork n $+S+ str#ct#ral and architect#ral
dra8ting, all dimensions o8 @ 8oot orover are #s#ally e4pressed in 8eet andinches
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22Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Millimeter Aal#es
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25Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Decimal nch Aal#es
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2(Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
%#les 8or Dimension
Aal#es >here the metric dimension is a
hole n#m.er, do not sho adecimal point or a 1ero
>here the metric dimension is lessthan @mm, a 1ero precedes thedecimal point
>here the decimalBinch dimension is#sed, a 1ero is not #sed .e8ore thedecimal point o8 val#es less than @
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2)Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
%o#nding Aal#es
8 the n#m.er 8olloing the ro#ndingposition is a ), ro#nd to an even
n#m.er 8 the n#m.er 8olloing the ro#nding
position is less then ), make no
change 8 the n#m.er 8olloing the ro#nding
position is more than ), ro#nd #p
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2;Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
D#al Dimensioning
D#al dimensioning is #sed to shometric and decimal inch
dimensions on the same draing
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2'Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Dimension Sym.ols
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2*Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
!lacing Dimensions
Never letter a dimension val#e overany line on the draing
n a gro#p o8 parallel dimensionlines, the dimension val#es sho#ld.e staggered
Do not crod dimension 3g#res intolimited spaces making themillegi.le
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29Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
!lacing Dimensions
!lace dimensions .eteen vieshen possi.le, .#t only attached
to a single vie Dimensions sho#ld not .e placed
on a vie #nless doing so
promotes the clarity o8 the draing
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5Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
!lacing Dimensions
>hen a dimension m#st .e placedin a hatched area or on the vie,
leave an opening in the hatchingor a .reak in the lines 8or thedimension val#e
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5@Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
!lacing Dimensions
void dimensioning to hidden lines Do not attach dimensions to visi.le
lines here the meaning is not clear Notes 8or holes are #s#ally placed
here yo# see the circ#lar shape o8the hole n e4ternal cylindrical shape is
dimensioned here it appearsrectang#lar
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52Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
!lacing Dimensions
Give dimensions here theconto#rs o8 the o./ect are de3ned
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55Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
S#per#o#s Dimensions
ll necessary dimensions m#st .eshon .#t avoid giving
#nnecessary dimensions Do not repeat dimensions on the
same vie or on dierent vies, or
give the same in8ormation todierent ays
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5(Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
S#per#o#s Dimensions
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5)Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Dimensioning ngles
Eo# sho#ld dimension angles .yspeci8ying the angle in degrees
and a linear dimension
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5;Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Dimensioning rcs
circ#lar arc is dimensioned in thevie here yo# see its tr#e shape
.y giving the val#e 8or its radi#spreceded .y the a..reviation %
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5'Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Fillets and %o#nds
ndivid#al 3llets and ro#nds aredimensioned like other arcs
8 there are only a 8e and they areo.vio#sly the same si1e, giving onetypical radi#s is pre8erred
Fillets radii can also .e given in ageneral note
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5*Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Si1e Dimensions= !risms
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59Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Si1e Dimensions= Cylinders
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(Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Si1e Dimensions= Holes
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(@Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Dimensioning Aario#s
Shapes
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(2Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Dimensioning C#rves
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(5Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Dimensioning C#rved
S#r8aces
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((Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Dimensioning %o#ndedBend
Shapes
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()Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Dimensioning
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(;Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Dimensioning
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('Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Dimensioning Cham8ers
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(9Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Dimensioning eyays
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)Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Dimensioning n#rls
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)2Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
S#r8ace %o#ghness
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)5Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Location Dimensions
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)(Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Location Dimensions
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))Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Location Dimensions
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);Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Location Dimensions
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)'Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Mating Dimensions
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)*Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
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)9Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Coordinate Dimensioning
asic coordinate dimensioningpractices are generally compati.le
ith the data re0#irements 8ora#tomated prod#ction
set o8 three m#t#ally
perpendic#lar dat#m or re8erenceplanes is #s#ally re0#ired 8orcoordinate dimensioning
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;Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Coordinate Dimensioning
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;@Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Coordinate Dimensioning
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;2Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Machine, !attern, and Forging
Dimensions
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;5Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
SheetBMetal ends
n sheetBmetal dimensioning,alloance m#st .e made 8or .ends
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;(Technical Drawing 13thEditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak,
29 !earson "d#cation, $pper Saddle %iver, N&'()*+
Notes
t is #s#ally necessary tos#pplement the direct dimensions
ith notes Notes sho#ld .e orded to allo
only one interpretation
Notes sho#ld .e letteredhori1ontally
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Standards
Dimensions sho#ld .e given tomake #se o8 readily availa.le
materials, tools, parts, and gages