Hydraulically operated spindle carrier clamping mechanism

In an automated machining apparatus of the type having a rotatable cylindrical carrier for holding stock material in spindles spaced at regular intervals thereon, a means for clamping the rotatable stock carrier, comprising:

• a) a controllable locking pin mechanism for selectable engagement and disengagement of a locking pin head into a slot on the carrier, said carrier having a plurality of such slots disposed on its circumference at regular intervals corresponding to the spacing of the spindles;
• b) a passive brake located adjacent to and in pressure contact with the carrier, and aligned substantially diametrically opposite the locking pin mechanism;
• c) a hydraulically actuated pressure brake located adjacent the carrier, positioned in an arc quadrant of the carrier's circumference in which the locking pin mechanism is located and having a controller means for controlling the actuation of said brake;
• d) a programmable controller for receiving and storing control data with respect to the desired rotation of the carrier and for outputting control signals to the hydraulically actuated brake controller to cause the brake controller to release the brake prior to desired rotation and to engage the brake after the desired rotation.