Riddle Me This? (direct MDT vs. STEP)

[Anonymous]

Stitched up a surface model in MDT2004 because it would not stitch
up in Inventor (one surface was twisted, amoung other problems).
So, once I had a Part created in MDT, I thought the best way to translate
it would be directly opening the MDT file. Opened fine, but I could not
pick any of the features to mate against. So rather than inserting numerous
workplanes, axes, etc, I tried using Step to import the file without healing,
stitch or promote options and Inventor now recognises flat surfaces as flat,
cylindrical holes as holes, etc.

So why does Inventor not see these flat surfaces and holes as such when
directly opening MDT files? THis may of course only be a problem with
imported geometry and not native MDT geometry, but still, one may wish
to keep in mind that STEP from MDT to IV8 may work better in these
non-native cases.

Bob S.

[Anonymous]

Did you do a custom stitch in MDT, with the healer enabled? Lots of wierd and wonderful things can happen with stitched surfaces,
and most of it I don't fully understand!

John Bilton

[Anonymous]

Yes, I did a custom stitch with healing as I've found it to work better in most cases
when I set the default heal distance to 0.1 from the default 1.0

I've also found it best usually to untrim any surface holes, re-create them after having
a solid part, and sometimes I also have to recreate the edge surfaces of a part by
copying the outer edges from the top and bottom and then put new ruled surfaces
between them (due mainly to bad modeling surfaces in the imported geometry).

Bob S.

"John Bilton" wrote in message
news:F566D33733BAE58C5CD6BC43C2778AF2@in.WebX.maYIadrTaRb...
> Did you do a custom stitch in MDT, with the healer enabled? Lots of wierd and wonderful things can happen with stitched surfaces,
> and most of it I don't fully understand!
>
> John Bilton
>