TURRET Refer to the Maintenance Manual -M-314A for more information. Introduction The turret is mounted on top of the cross slide. The turret top plate is raised (unclamped) and lowered (clamped) by pneumatic (air) pressure and then is indexed by a motor, gearbox, and belt driven system. The best place to gain access to the turret components is from the front of the machine with the turret covers off which means that the rear guard (safety cage) needs to be removed and, then, turret covers taken off. Power-Down Procedure Whenever the safety cage is removed the machine must be powered down. A detailed procedure to power down and lock out the machine appears in M-314A Maintenance Manual Chapter 2 - Power-Up Procedure. 1.Be certain that Cycle Start is not active. Pushbutton light is OFF. 2.Be certain that the program has been completed and that the spindle and slides are stationary. 3.Press the EMERGENCY STOP pushbutton. 4.Rotate the Control On/Off switch counterclockwise to OFF position ( ). 5.Turn off and lock out the main air valve or disconnect the air source from the machine. 6.Turn off and lock out the main electrical disconnect switch. Turret covers REAR GUARD TURRET Rear turret cover 1
Index Motor Gear Box Top Plate Index Belt Encoder Index Belt Encoder Belt Gear Box Belt Tension Four Screws 2
Turret Assembly Alignment Check turret face for parallel to X axis move. 1. Mount indicator to check turret face. 2. Move X axis to check for straightness of.0005 in a 4 move. If out of specification: 1. Remove turret covers 2. Install special tool: turret alignment block at right side of turret base to help move the turret body. 3. Loosen the 4 screws that mount the turret housing to the cross slide. 4. Adjust turret housing until turret top plate face is straight. 5. Tighten down the turret screws to 100 ft.lbs. After turret re-alignment, the turret belt and encoder belt tensions must be checked. Set turret down Switch gap to.047 Refer to the Maintenance Manual M-314A for Sonic belt settings. Standard is : Encoder belt =.08 inch deflection at.36 to.64 pounds push. Main Turret belt =.14 inch deflection at 22.6 to 24.5 pounds push. Down switch Four Screws For Turret Body Alignment 3
Note: If Turret face is out of specification, check the tram of X axis slide to casting. To verify the X axis dovetail has not moved. To check dovetail tram for straightness: 1. Jog X axis in the plus direction as far as it will go. 2. Mount indicator base to the bottom of the turret as shown. 3. Place indicator needle on casting at left side right below the dovetail bed. 4. Slowly Jog X axis down to the bottom of the dovetail while observing the indicator. 5. You should have no more than + or -.001 Maximum in 4.5 inch move. 6. If out of spec the dovetail probably has moved and the dovetail pin(s) are broken or bent. Refer to replacement procedures. Indicate this machined side of the casting surface Turret Top Plate Radial Alignment Check turret for radial alignment. Note: Headstock and turret face must be straight before aligning turret top plate. 1. Mount indicator into spindle. 2. Move X axis to position X minus -.630 ( X 0.00 for VDI top plate). 3. Move Z axis so you can sweep ID of turret bore.( not tool holder) 4. Move X axis for 0.0 reading in X plane, rotate indicator 90 degrees check for reading of +/-.0028 inch. ( for VDI +/-.0015 ) 4
If out radial : 1. Remove the number plate from the face of turret. 2.Loosen outer circle of 8 M10 screws no more than 2 turns. 3.Rotate the top plate radial (might be easier to drop air pressure to 30 psi) 4.Once radial aligned, tighten down the 8 M10 screws until all are set to 25 ft. lb., then to 50 ft. lb. 5.Recheck ID of turret bore. Outer Circle of screws Reading should be zero top to bottom and within +/-.0028 in and out. X home setup may be required if X position is off in the X plane. Note: Also there is a radial alignment bar to use. Mount the bar to the face of the turret and then indicate the top of the bar while moving X axis, check for radial straightness. Then verify headstock is in alignment with turret by sweeping the turret bore. 5
Turret Home Set-up Cobra 42 1. Change Parameter Write Enable: Select MDI from Operator Page. Press Offset / Setting Hard Key. Press Setting Softkey.Cursor to Parameter Write Enable Press 1 then Press INPUT. 2. Set parameter 1850 A to a 0. Press System hard key,press Param soft key, key in 1850 Press No.SRH soft key. Press cursor key down to highlight A, Key in 0 Press input. 3. Turn Control Off. 4. Turn Control On, E-stop Reset, Close Guard Door. 5. Set the main air pressure to about 35 PSI. 6. Select Ref. Mode on Operator Panel. 7. Press Feed-Hold & Cycle Start simultaneously to Reference Return the turret. - ( the Turret should Raise And Rotate, if Not see the Next Page Note.) 8. In MDI mode, set PMC parameter K 02.2 to 1 To get to the PMC K-words Press: System (Hard Key), Pmc (Soft Key), Pmcprm (Soft Key),Keeprl (Soft Key). Cursor down to K02 (Byte number 2 is the third number over from the right). K02 normally reads 10010000, Change it to 10010100 9. Press Collet Open/Close button to unseat (raise) the turret. 10. Press Cycle Start or Feed-Hold buttons to rotate the turret CCW or CW to align the top-plate to station # one (1). 11. Seat the top plate (press Collet Open/Close). Make sure the turret seats straight and all the way down. 12. Press System, Press Dgnos, Type in 301, Press No. Srh 13. Divide the value in DGNOS 301 A (mach position) by 10 and enter this value into Parameter 1850 A. Press System hard key,press Param soft key, key in 1850 Press No.SRH soft key. Press cursor key down to highlight A, type in the value press input. 14. Turn Control Off. 15. Turn On the Control,E-Stop Reset, Close Guard Door. 16. Select Ref. Mode on Operator Panel. 17. Reference return the turret. (press Feed-Hold & Cycle Start simultaneously). 18. Set the main air pressure to 80 PSI. 19. Select Jog mode 20. Index to all turret stations in both directions observing Dgnos 301A, the counts should end within plus or minus 30 counts. Example: 24000,27000,30000,33000,36000. 21. If more than 30 counts, change parameter 1850A and then reference return the turret again. 22. Change Parameter Write Enable: Select MDI from Operator Page. Press Offset / Setting Hard Key. Press Setting Softkey.Cursor to Parameter Write Enable Press 0 then Press INPUT 23. Press RESET
NOTE: If the turret will not rotate when trying to Ref. Return the turret because station is at or near 1 : 1. Set Main Air Pressure to about 35 psi. 2. Select MDI mode on the operator panel. 3. Press offset/setting function key. 4. Press setting soft key. 5. Type in 1 ( for Enable Parameter Write). Press input key. 6. Press system key. 7. Press pmc key. 8. Press pmcprm key. 9. Press keeprl key. 10. Cursor down to K 2. 11. Cursor right to bit 2 (Byte number 2 is the third number over from the right). K02 normally reads 10010000, Change it to 10010100 12. Type in 1. 13. Press input. 14. Press collet open/close button to unseat (raise) the turret. 15. Press cycle start or feedhold buttons to rotate the turret to station 2 or another station. 16. Seat the turret top plate by pressing collet open/close button. 17. Press offset/setting key. 18. Press setting key. 19. Type in 0 ( to disable parameter write ). 20. Turn control off. 21. Turn control on. 22. E-Stop Reset, Close Guard Door 23. Select Ref mode on the operators panel. 24. Press feedhold and cycle start simultaneously to Ref return turret. 25. Set Main Air Pressure to 80 psi.
Turret Disassembly To replace seals or bearings in the turret: 1. Power down the machine and turn off the air. 2. Unthread the screws and remove the rear guard. 3.Unthread the screws and remove turret covers. 4. Loosen the Four screws at the gear box mount to allow the belt to loosen Left side of gear box Right side of gear box 8
5.Loosen the encoder assembly screws and 4 screws for gear box 6.Loosen the encoder stud nut at end of turret pulley using a special tool or face the face. Encoder stud Encoder screws Remove the turret number plate from the face of the turret. - WARNING - 8. Support the turret top plate with hoist. 9. Remove the center 8 screws to remove the top plate. Center mounting screws 10. Remove the encoder stud nut. 11. Remove the pulley and key. Remove the 8 screws on the rear piston cap and remove the piston cap. pulley Encoder stud nut Piston cap screws
13. Remove the piston. 14. Replace the seals if needed. 15. Replace the bearings if required. Seal Piston Cap Thrust Bearing Key Turret Housing Encoder Stud with Pulley Piston Seal Bearing Pulley Coupling Housing Top Plate Seal Seal Ring Bearings 10
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Turret Reassembly 1. Clean all surfaces. 2. Replace the seals. 3. Repack the bearings with grease. 4. Lightly coat the seals and O-Rings with grease. 5. Install the seals with the lips in the proper direction, refer to the assembly prints. 6. Carefully with a rotating motion install the piston all the way into the bore. 7. Clean seal protector tool LC-8-AC and slide over piston shaft.( this tool has a large taper on the outer end to allow the seal inside the rear piston cap to slide on the shaft). 12
8. Carefully with a rotating motion slide the rear piston cap over the seal protector tool and on to the piston shaft. Align the air hole and squeeze the rear cap into the housing. 9. Install the screws and alternately tighten to 10 then to 25 ft-lbs. 10. Remove the seal protector tool. 11. Install the key and pulley assembly. 12. Apply loctite on the threads of the encoder stud nut and install, torque to 100 ft-lbs. 13. Clean and install the top plate. 14. Install the turret drive belt. 15. Install the encoder belt. 16. Perform Turret Index Belt Adjustment and Encoder belt adjustment -( this procedure is in the Maintenance Manual) 17. Perform the turret home setup procedure. 18. Replace the turret covers. 19. Install the rear guard and tighten the screws. Turret Drive Gear Box Mounting Plate Index Motor Pulley Turret Drive Alignment - This is in the Maintenance Manual -------------------- The turret drive (gearbox) may require re-alignment when turret tooling or top plate makes contact with the spindle nose, workpiece, or tailstock. If the top plate oscillates back and forth before setting down, check the turret body alignment then check the turret drive alignment. 13