Whew... a bit confusing.
When you say drawing I assume you mean 2D, either paper or Autocad-like
file? And you send this 2D file to the mold house ?
Both Solidworks and Pro-E are solid modeling systems. Your mold maker will
construct a 3D solid model to design a mold around, all of which will be
done in solids. He will then generate the CNC code to cut the various parts,
cores/cavities, directly from the 3D models.
As far as the last part, I'm confused. After the mold maker constructs the
Pro-E model, you have your solid model. It wouuld be very difficult though
to tell whether it's right or wrong without having a solid modelling system
to analyze it with.
It's pretty much standard operating proceedure these days to do all of your
design work on solids upfront. This usually includes a complete solid
assembly of the entire device so you can tell how (and how well) all the
components fit together.
When you go from 2D directly to the mold house, you lose control of your
design. Lots of expensive re-work is almost guaranteed. What your describing
to me is the way things were done fifteen years ago, This was when 3D CAD
systems were very expensive, and not all companies could afford them.
Solidworks is about $4000.00. A similar 3D CAD system fifteen years ago
would cost $30,000.00 for software, and $25,000.00 for a UNIX machine to run
it on. You really need to get current here. Price isn't an issue anymore.
When you design in solids, all you have to do is send the 3D solid model to
the mold maker, and your done.