ENCODER_RATIO function implementation.

Confusing? For me for sure:) 
I'm now surprised by this hobbing.comp and its installation as i don't see you used "loadrt hobbing"+"addf hobbing.0" in the previously attached files.
 

The whole thing has evolved over time, and I have failed to update the wiki page. (its been about 13 years...)

I have attached the whole config folder.  But be aware that this machine has many configurations and so has several INI files. 
If you start with the hobbing.ini and look to see which HAL files it uses, you should be able to identify all the used files. 

I am hobbing without any special UI for a while now. I change invert.0.in pin manually. There are some other parameters that I would have to change manually, when using "additional" rotation for Pfauter method. But I barely touched this, mainly because of mechanical setup issues.
I really would (should) give it another try, but my patience was not high enough. I am interested in improving the situation on my machine.

@boogie, please keep us update how it is going. , maybe I can finally get there.

As I understand it the UI that Andy made runs as "sub window" in the Axis UI and provides the special inputs and some features.

Greetings Timo

 

Yes, mainly the UI does the gear size / depth calculations and gives you a span measurement to run a quick test that the tooth depth is correct.
It could be more aesthetic:

Thanks for the screen shot.
I think it looks "good enough" (at least for me using it for DIY hobbing of "toy gears" )
Do I understand this right that a G-code file is generated based on the input data to run the process?
Does "shift" button refer to profile shift or is it doing a hob shift? (tangential hobbing )?

Greetings Timo

There is a fixed but parametric G-code file as part of the config that does the feeding / multiple passes.

You should definitely look at that file to see what it does, and also what it assumes. The system assumes that the tip of the cutter is touched-off to the workpiece radius (ie Z = 0 is on the work axis)
Also note that the axis assignment is a little unusual, with hobbing radius as Z and work axis along X.

"shift" is a profile shift, simply a radial offset of the hob relative to the workpiece centreline.