Came back after dinner, and it was done.

Trying some prompts:

- "1/4 inch bolt, hex head" -- result is a cylinder with no bolt head.

- "1/4 inch bolt" -- "The prompt must clearly describe a CAD model"

- "1/4 inch threaded rod, 3 inches long" -- same

- "0.25in threaded rod, 3 inches long" -- same

- "Plate, 3in x 5in, with rounded corners." -- same

- "Plate with rounded corners" -- blank result

Now it's too overloaded to do anything.

This is kind of an interesting idea. It's a good project to get a large language model and a constructive solid geometry model on speaking terms.

This needs to be a dialog. Something like this:

> Create a flat plate, 100mm x 300mm x 3mm thick.

> Round corners, 20mm radius.

> Drill four holes in the corners.

> Holes are inset 20mm from edges.

> Holes are 6mm diameter.

> Allow extra hole diameter for standard 6mm screw.

> Round edges of top surface of plate.

Those are all things you can express to Autodesk Inventor through its GUI.

What you'd really like to say is:

> Import this file. Here is a mounting plate for a motor.

OK

> The four holes near the center are mounting bolts for a standard NEMA motor.

OK.

> What motor frame size is it for?

NEMA 42

> Change the bolt holes to fit a NEMA 56 at the same position.

OK. (Drawing changes).

Now it's working under Firefox.

Weird, though, I asked for "6 inch by 6 inch plate with four bolt holes for NEMA 42 motor frame, centered on plate".[1] That should get me four holes in a square pattern. It got me three holes.

It has no clue what the standard NEMA motor frame sizes are, because I asked for a nonexistent NEMA number and it accepted it. That's an LLM hallucinating, probably. It's not an acceptable feature in engineering.

[1] https://text-to-cad.zoo.dev/view/fac162c0-0d5e-4e33-a2d8-2c3...