Version: 1.4

Steps to reproduce

Extensions | Render | Gear ...

Then, Extensions | Render | Gear | Rack Gear...

and the result is this:

There's no way they're going to mesh!

Am I doing something wrong or is there an extension problem?

Many thanks.

[Sorry for the mess on the original version of this post. I couldn't figure out how to insert an image. I never thought of drag and drop directly into the text area.]

Have you tried to zoom out? The gear will appear in the upper left corner of the page:

Thanks, @Polygon. Not that you've taught me (in the Test Area) how to upload images, I've edited my original post to show the problem.

I'm not sure what you mean by "mesh". Can you explain perhaps? Editable paths maybe?

I mean "mesh" in its mechanical engineering sense. The teeth of the cog should engage fully in the rack. They don't. The cog teeth are twice the size of the rack notches.

The discrepancy comes from different units; while we can choose between px/mm/in for the Gear the Rack Gear is px only here. So if you stay in px while generating the gears you can scale them later together to the final size.

Ah, thanks. A note in the Rack Gear dialog to say that it's using px measurements would be useful.

Interestingly the gear-gear meshes (2) are much deeper than the gear-rack (1) mesh.

It should look more like this.

Image source: https://www.tec-science.com/wp-content/uploads/2018/11/en-involute-gear-rack-meshing.mp4.

Transistor

Ah, thanks. A note in the Rack Gear dialog to say that it's using px measurements would be useful.

I would have expected the same list of units for the Rack Gear honestly. 😉