I wish to cut multiple copies of the same size wheel in one go, so that I have spares in case of in inevitable mistake, and also so that I may end up with most of the parts for more than one watch with little additional effort. This means making up a mandrel to hold multiple wheel blanks for the wheel cutting process, instead of just using a superglue arbor for a single wheel.
At last, more progress on the tool making. After breaking the cutting tool while making the hob for the worm wheel, I started looking around for off-the-shelf worm drives. A low backlash one came up on eBay for $100 including a stepper motor, so I jumped.