In recent years, machine tool manufacturers have purchased motor parts from servo motor manufacturers and wound the motor rotor directly onto the main shaft of a hollow shaft.
Built-in types are the norm.
Tsubaki's special-purpose product is used to connect this hollow main shaft and rotor. SL type, EF type The Power-Lock is used.

Since the rotor rotation speed is high, Power-Lock end face is equipped with a threaded tap for balance adjustment.
Also, EF series The taper direction is reversed to prevent the boss from moving during assembly.

​The SL series is used to fasten the motor shaft of the tool post (turret).
Turrets that hold multiple tools require precise indexing accuracy,
A backlash-free Power-Lock is used to secure the rotating shaft.

Tool change arms, which change tools, are equipped not only on machining centers but also on multi-purpose lathes.
Modern tool change arms are subject to alternating loads at surprisingly high speeds and frequencies, making key fastening difficult.
This tool change arm uses Power-Lock EF series and KE series.