How does the TOE turret work

Working sequence of the TOE turret

  • Brake 175 connected
  • Motor disconnected
  • Electromagnet 200 disconnected
  • Rotating crown 003 linked to the fixed crown 002 through the short circuiting crown 004.

The disc springs (Belleville) are pressed, by means of the three rollers on the three cam ends of the short circuiting crown, keeping the Hirth teeth of the crown in contact.


Electricity is cut off from the brake and connected to the motor which, through reduction gears starts rotating the planetary roller ring 006, which stops, after a preset angle, against a positive stop.
During this phase the central spring 034 pushes the short circuiting crown (004) back, because the roller descend on the cam and this movement unlocks the rotating crown(003).That will result to rotate the main shaft of the turret by means the pinion .
Nearing the target tool station, the strobe signal (given by angular encoder 160),energise the electromagnet 200 and the magnet pushes down the pre-indexing pin 017 into the pre-positioning recess in the divider 005.This will stop the rotation of the crown and the tool holder disk which is bolted to it. The resulting shock is absorbed by the buffer pads 032.
While the electromagnet moved down, the pre-indexing proximity switch 301sent a signal.
Arrival of this signal causes the reverse of the motor rotation, and also the planetary roller ring 006; so that the rollers rise on their cam ends and push the short circuiting crown ahead, causing the Hirth teeth to engage.
Passage of the external profile (I) of the planetary roller ring 006, activates the locking proximity switch 313, indicating that the turret is closed.
When this signal arrives, current will cut off from the motor and the brake 175 will be energized to keep the motor in this position. Immediately afterwards the electromagnet is deactivated, and consequently the pre-indexing pin pushes out of the recess by the spring 047.