This can create part of cycloidal drive

• Cycloida gear (gray)
  • Trochoidal parallel curve
  • Centor hole
  • Around hole
• Ring pin (yellow)
• Output disk pin (green)

You clone this in

Windows – %appdata%\Autodesk\Autodesk Fusion 360\API\Scripts\
Mac – $HOME/Library/Application Support/Autodesk/Autodesk Fusion 360/API/Scripts\

You need least 5 parameter

raducation ratio = 1 - (ring pin num / cycloidal gear thooth num)
This script support only max raducation ratio.
So, ring pin num = cycloidal gear thooth num + 1

Difference between centor of ring pin pitch ring and centor of cycloidal gear.

diameter

Pitch ring is through to the all centor of ring pin.

This script reder curve in sprine command.
So, you need to decide point num.
If few point num, cycloidal curve be inexactitude.
If a lot of point num, run slow.

If you want to draw more, you can draw centor hole, around hole and output disk pin.

If you check this, drawn centor hole and you can set diameter.

Centor hole diameter

If you check this, drawn around hole and you can set parameter.

If you check this, drawn output disk pin and you can set parameter.

Around hole parameter linked with output disk parameter.
You can choise set about around hole's parameter or output disk pin's parameter.

Around hole or disk pin num.

Around hole or disk pin diameter.
around hole diameter - output disk pin diameter = 2 * Eccentric amount

Centor of cycloidal gear to around hole distance.
Or centor of output disk to output disk pin distance.

You can set unrelated parameter to cycloidal drive.

If you check this, create 3 sketch(cycloidal gear, ring pins, output disk).
Else, create 1 sketch.

If you check this, create 3 component and create sketch in each component.
Else, create sketch in active component.