hello i assume its a falcon or hawk 200 or 250 lathe. the turret is clamped by the motor on the rear of the turret. the sequence is
when the turret index is commanded to move the turret motor turns unclamping the turret and turning untill the 'resolver' tells it it is in the correct position.the solenoid is energised and the shotbolt is pushed down into the slot in the main ring. this stops the index and reverses the motor.this reversal draws the turret onto a 'curvic' coupling this gives the solid clamp that is required.when it is clamped the proximity switch beneath the motor is made - cycle compleat. so is your motor reversing? the machines have two methods of reversing. the early machines had reversing contacts in the panel.later machines used an inverter.try clamping the turret manually and then try indexing the turret both ways. if it moves one way but not the other then either one of the contactors could be faulty or the inverter is us or you could have a wiring fault.to manually clamp
remove rear cover-you will have to take off the crash switch
remove the round duplomatic cover held by 4 silly little countersunk screws
this will reveal the solenoid
insert a 6mm allen key thru the rear of the motor (think its 6 might be 5mm)
push down the shot bolt in the middle of the solenoid.keep it pressed and turn the allen key clockwise.you should see the turret turn and the shotbolt engage with one of the slots.keeping the shotbolt pressed turn the allen key anti-clockwise.you will start to feel resistance keep turning untill this resistance slackens slightly.the turret is now clamped.BEWARE IF YOU DONT TURN ANTICLOCKWISE ENOUGH THE ALLEN KEY WILL SPIN AND HURT YOUR FINGERS IT DOES MINE.I WOULD SUGGEST USING A RACHET UNTILL YOU GET USED TO IT.E-MAIL ME AT
[email protected] if you have any questions.best of luck mallardfizz