Roscamat TIGER

Revolutionary Electric tapping arm machine, able to thread from M2 up to M27 in steel (M33 in aluminium, foundry, etc), The modular system permits the machine working in different speeds and toruqes according the size and material. Equipped with speed control, has optional choices like automatic tool lubrication and depth control system. This equipment can save more 93% of the energy cost working one hour during 1 labour day with respect to other pneumatic tapping arm

[krap]

Interesting. It seems like it uses the angular velocity at the joint to control the spindle direction and possibly speed.