EJ at Scanvec Amiable would be able to enlighten you. I have his email if you want to email me at
dan.antes@gmail.com I will forward it to you. I know that tapping can not be done with a low torque high RPM spindle that would be on most sign shop or wood shop routers. It takes a high torque low RPM spindle like a steel milling CNC would have on it. Tapping is done at very low RPM's. A high frequency spindles looses HP as it RPM is decrease. Good luck!!!