REDesigner09
Aerospace
- Nov 19, 2010
- 227
Hi,
I would like to get some clarification between the usage of CAD datums (used within CAD applications such as Unigraphics NX, ProE, etc.) used to create various CAD models or turbine blades & between GD & T Datum features.
In many instances, there are 3 CAD construction datums used to define a center of an airfoil, root serration or mid-section of a root.
Also, in many instances, on the Casting or Machine Drawings, I see these same CAD construction datums as the primary, secondary & tertiary GD & T Datums - See example picture.
Is this appropriate usage of CAD datums & GD & T datums? If not, what would be the appropriate usage of GD & T datums, particularly between Casting model & a machine CAD model to display on drawings.
Any examples would be appreciative.
Thanks
I would like to get some clarification between the usage of CAD datums (used within CAD applications such as Unigraphics NX, ProE, etc.) used to create various CAD models or turbine blades & between GD & T Datum features.
In many instances, there are 3 CAD construction datums used to define a center of an airfoil, root serration or mid-section of a root.
Also, in many instances, on the Casting or Machine Drawings, I see these same CAD construction datums as the primary, secondary & tertiary GD & T Datums - See example picture.
Is this appropriate usage of CAD datums & GD & T datums? If not, what would be the appropriate usage of GD & T datums, particularly between Casting model & a machine CAD model to display on drawings.
Any examples would be appreciative.
Thanks