I had a 40mm thick polycarbonate shelf left in the shop and took that opportunity to machine some recess rings for the spindle moulder table. The material dimensions led to three Ø190mm rings with 145, 130, 120 centre holes and four Ø130mm ones drilled 110, 100, 90 and 80.
The variable frequency drive enabled for the resawing of the polycarbonate by reducing the carbide tip speed about 25 meters par second as well as thickness sanding the two plates. I made a template aiming to copy the external diameter of the larger metal ring that came with the machine. That method seemed suitable to Ø190mm rings but I didn't feel comfortable with small ones which were machined the same way the routing table recess rings did. That paper only describes the machining of large rings.

After locking the template on the workpiece I clamped the angle fixture to the rip fence and roughly sawed the external shape one millimetre grater than the pattern.

Then copied the external diameter with an insert rebating cutter and machined the rabbet keeping the same cutter with a smaller guide ring. With the same method the adjustable bevelling cutter chamfered the bottom of the ring.

The adjustable circle hole drill bit had not the ability of boring such centre hole and I used the jig saw and completed with the sanding drum. Fortunately the centre hole didn't have to be accurately concentric.

I set up the routing table for spindle moulder then locked a 45° chamfer bit into the router chuck accessory and machined the internal chamfer.

I can't avoid lack of room in my workshop and you may see where the ring housing locates.