Defining Datums Between Casting & Machine CAD Models to Drawings
Defining Datums Between Casting & Machine CAD Models to Drawings
(OP)
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





RE: Defining Datums Between Casting & Machine CAD Models to Drawings
I suggest you ask folks from here to post over there to keep the discussion in one place, is thread1103-297160: Turbine Blade Drawing Template the relevant place? The wording of the OP looks familiar but doesn't quite match the thread I link.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Defining Datums Between Casting & Machine CAD Models to Drawings
Yes, I did post a similar question on the GD & T forum. I was hoping to get some Aerospace Engineers perspectives or clarifications on this topic here because I'm working with Turbine Blades.
Thanks
RE: Defining Datums Between Casting & Machine CAD Models to Drawings
However, to stay on the right side of site managements double posting rules I suggest you encourage anyone from here to post over in your original thread.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?