The motor is said (per mfg) to have 30 kgcm of torque, that is = to ~26 in/lbs. With that torque (from 2 points) you have to overcome the weight of the platen, router, chain, wiring, vacuum hoses, bricks, drag forces, and cut material. Depth of cut obviously plays a role with this too. I would think we are close to the limit right now for the motor. And yet further down the post for the product the mfg says that at the rated load the motor would have 50kg.cm (40 in/lbs) {seems inconsistent) I wonder if we went to a higher gear ratio with a higher voltage we could keep a similar speed and have more torque headroom.
From the reference data, the motor that is currently chosen is only rated for 9-14v. Then again lower on the page it says it can run at 6v, 12v, or 24v. When I pushed it to 24v (only during testing) it worked but the motor and gearbox got hot. The supplier shows a 12-24v model with 12v nominal but the rpm and torques listed don’t make sense to me.
The real test is if people are breaking teeth or if the motor is even able to keep up with the desired load.
I put the text from post 1 up on github.