GMT LATHE CHUCK MOUNTING

MOUNTING THE CHUCK
1. Check the location dia. and face of the machine spindle for Radial and Axial Runout using a Dial gauge. Maximum permissible Radial Runout and Axial Runout of the spindle shall not exceed by 0.005 mm.
2. Mount the chuck flange on the machine using the necessary clamping screws or the special provisions made by the manufacturers.
3. Check the flange for true running for Radial and Axial Runout and ensure that these do not exceed 0.005 mm.
4. Connect the drawtube/draw bar to the cylinder. If the drawtube/draw bar is to be fitted into the cylinder piston rod, ensure that the piston rod is retracted. If fitted at the intermediate position, the anti-rotation stop pin of the piston may be damaged.
5. Mount the Cylinder Flange on to the spindle rear side and check the flange for true running for Radial and Axial Runout and ensure that these do not exceed 0.005mm.
6. Mount the cylinder on to the cylinder flange.
7. Connect the pressure ports of the cylinder by hose.
8. Actuate the cylinder at low pressure (4-5kgf / cm2) two or three times and set the piston towards the cover end and switch off the hydraulic power.
9. Remove the cover from the chuck by removing cover clamping screws.
10. Keep the Wedge in fully de-clamped condition (At this position, the jaws will be fully opened).
11. Clean the chuck location diameter and hold the chuck in such a way that the collar just touches the drawtube end. Tighten the collar on to the drawtube using the special spanner provided, until the chuck sits properly on the flange face. Align the chuck clamping holes with the tapped holes provided on the chuck flange.
12. Tighten the collar with drawtube(in case of draw bar, tighten the wedge screw into the drawbar) and chuck clamping screws simultaneously till the chuck location face butts against the flange butting face.
13. True up the periphery of the chuck with the help of plastic mallet.
14. Ensure there is a gap (approximately 0.5 mm) between the wedge face and body inner face by adjusting wedge screw or wedge collar.
15. Reassemble the cover.
NOTE:
1. Before tightening the chuck flange (Adaptor plate for mounting the chuck) with the Taper nose of the machine spindle, ensure that the clearance between the spindle face and chuck flange butting face is not more than 0.03mm.
2. The flatness of the face of the chuck flange after machining on the machine can have only concavity maximum 0.01mm. Convexity is not permitted. Check with the help of straight edge for blue bearing.
3. Actuate the actuator and check the jaws are moving freely and check for the jaw stroke.