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April 2009
Volume I Issue II
Previous Issue

Error-proof Drawings

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  Direct Editing using Instant3D - New Paradigm in Solid Modelling Technology

Instant3D G D & T using SolidWorks
DimXpert empowers users to develop correct and complete drawings for their designs while ensuring complaince to ASME Y14.5.  Never has been an approach so easy and complete for ensuring fool-proof drawings.  DimXpert goes a long way in ensuring downstream errors attributed to drawings are a thing of the past.


GD & T inside SolidWorks:

SolidWorks enables designers to create drawings per ANSI or ISO GD & T standards, namely, ASME Y14.41-2003 and ISO 16792:2006. 
  1. Correct use of GD & T Standards
  2. Completeness in drawing development
  3. Errors in drawings and their reasons
  4. Selective choice of Manual or automatic Dimensioning
  5. Plus or Minus Tolerancing as well as GD &T approach
  6. Status of Drawing Definition - Over, Under and Exactly defined features
In this article we take an example of a Hydraulic Cylinder Flange and show how DimXpert can be used to define the same.
Hydraulic Cylinder Flange Views
Hydraulic Cylinder Flange Views showing Datum Selection
Datum Selection follow the accepted criteria of being Functional, accessible, repeatable and strongly reflecting mating surfaces. Rear Flat Face of the flange is taken as Primary Datum, Cylinder recess (shown in Blue) is taken as Secondary Datum reference while Flange Base (shown in Green) is taken as Tertiary Datum reference.  Among them Secondary Datum reference being a Datum Feature of Size, can be subjected to material modifier.
Datum Definition

Multiple Views of Datum Definition
Datum Definition in DimXpert Manager
DimXpert Manager Tree for Datum Definition

GD and T Annotations using DimXpert
Addition of Perpendicularity for Datum B Bore with respect to Datum A defines Level III orientation control adequate for Datum Feature of Size definition.  Progressively using Datum Feature of Size B, locaation control for the 120mm Diameter hole and pair of slots while using Datum A as primary and Datum C as tertiary references, the Feature control Frames address Level IV control.  Defining the Fillets and Chamfers further, the status of adequately toleranced features and under-defined features are highlighted, as green and yellow respectively, to enable the user to completely define all relevant features with clarity and correctness.  A feature highlighted in red described over-defined status.


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