2009 figure 4-28 is actually showing a linear-extruded datum feature per figure 4.3f; otherwise the presence of a secondary datum feature (12x pattern of holes) would result in an overconstrained DRF. Also, you'll notice the side-view within figure 4-28 appears to be showing a constant...
Just getting back to the main point of the post... I'm simply suggesting that theoretical datums - however important or unimportant they might be for any particular situation - really ought to include mathematically-defined complex-contoured surfaces. More specifically - the "definition" for a...
Have to disagree a little bit here... I agree the theoretical datum doesn't mean a whole lot for a lofted datum surface (other than for the purposes of teaching the class, I guess)... But the presence of a DRF coordinate system? That's going to be absolutely essential. Especially when we start...
Regarding how the simulator might be implemented... First and foremost - I would never reference that lofted datum RMB... A physical RMB simulator for a large lofted surface is just not feasible. For the case of a large composite part? Assuming no modifications have been made to the original...
Only with regard to the fact that this "complex" datum controls all six DOF. Beyond that? The component elements of this particular datum (point, axis, plane) will not match the component elements of an otherwise asymmetric irregularly-shaped lofted surface... I think it would be silly if not...
I do agree that this whole exercise of considering theoretical datums is somewhat irrelevant. The only reason it's bothering me? We have an answer to the question "what's the datum for this datum feature?" for literally everything else... So by saying "a mathematically-defined complex-contoured...
Good morning folks!
Long-time reader... first-time poster... ASME GDTP-2009 Senior...
Here's the question: Y14.5-2009 figure 4.3, bottom row... We see an example of how a "complex" datum feature MIGHT (in this one particular example from that figure) be able to produce a combination of...
