Autodesk Autocad Full 2012 Manuel télécharger pdf (Page 17)

AutoCAD2011ProductivityStudy

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17 ©2010DavidS.Cohn

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DrawingTask#8

Intheeighthandfinaldrawingtask,standardAutoCADcommandswereusedtomodeltwovariationsofa

pulleyassembly,includingallofthedimensionsandthecalculatedlengthofeachpulleybelt.First,eachpulley

wheelsizewasmodeledasaseparateblock.Then,theappropriateblockswereinsertedand

positioned.

Finally,thepulleybeltwascreatedandthentextaddedalongwithafieldthatreportedthelengthofthebelt.

Figure9showsthecompletedtask#8drawingwithbothvariationsofthepulleyassembly.

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Figure9:Completedtask#8drawing–twovariationsofapulleyassembly.

BecauseofthenewparametricfeaturesinAutoCAD2011,Ianticipatedsignificantproductivityimprovements:

• InAutoCAD2008,thevariouspulleywheelsmustbeinsertedatormovedintotheprecisepositionas

thedrawingiscreated,andthendimensionsadded.Then,tocreatethesecondvariation,thefirst

pulleyarrangement

canbecopied,thenecessaryblocksreplaced,andtheneachofthepulleywheels

movedtoitsnewposition.

• InAutoCAD2011,thevariouspulleywheelscanbeinsertedattheirapproximatepositionsandthen

dimensionalconstraintscreatedbetweeneachwheel.Byspecifyingthecorrectdimensionwhen

theseconstraints

arecreated,thewheelsautomaticallymoveintotheircorrectposition.Bycreating

thesedimensionalconstraintsasannotationalconstraints,thereisnoneedtoadddimensions;the

constraintsserveadualpurpose.Then,tocreatethesecondvariation,thefirstpulleyarrangement

canbecopied,thenecessaryblocksreplaced,andthedimensional

constraintsmodifiedtomovethe

wheelsintotheirnewpositions.

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Autodesk Autocad Full 2012 Manuel Page 17