Hello:
I have one of the versions (plastic, not metal) of the Unimat 3 Thread Cutting Gears accessory (#150200).
From what I can make out, the gear table you have posted reads like this:

Is M10 the largest diameter that can be threaded with this accessory?
I mean ...
What is needed to get a properly installed grooving tool on the carriage/slide to move/cut towards the headstock at 1.0mm / revolution on a piece of round stock larger than M10?
Am I missing something? Most probably ... 8^¡ã
I have not been able to find a manual for this 150200 part save this chart.
Thanks in advance.
Best,
JHM