Machine tool accessories center frame tips

        (1)Center frame of the application form

　　1)The center frame is supported on a suitable supporting surface in the middle of the work piece, and the center frame is supported on the auxiliary sleeve.

　　2)One end of the clamp, one end with the center frame support, this form of use and more for turning face and in.

　　Holes, and deep holes in turning long shafts, such as taper holes for turning or restoring lathe tailstock sleeves.

　　(2)Central frame of operation essentials

　　1)The operation procedure of the center frame is that after the center frame is fixed on the bed, the lower two supporting claws are evenly contacted with the workpiece support surface and locked after the workpiece is rotated, and the upper supporting claw is tightly fastened to adjust the position of the upper supporting claw. Locked Supporting parts of the machine tool jaws should be applied evenly, tight and comfortable, natural and smooth.

　　2)Each supporting claw should exert a balanced force so that the supporting surface remains in the original space state, that is, the bearing surface is coaxial with the rotating center of the main shaft to prevent the pressure of each supporting claw from deviating from the center due to the uneven pressure, resulting in the phenomenon of positioning.

　　Over positioning will make the workpiece taper, serious, frequent rotation of the workpiece twisting, resulting in the workpiece prolapse accidents.

　　3)When the machine tool parts are clamped and clamped with the other end supported by the center frame, the symmetrical cross center line or the detection of the upper busbar and the side busbar should be used to find the correct workpiece. Machine parts because the center frame three support claws have their own set. D role, adjust the claws to determine the spatial position of the support surface, then measured with a scribing disc or dial indicator, the swing value is always zero. Then machine parts, then the workpiece clamping position is correct? Machine tool accessories in this state, with. b drilling close to the workpiece end, then the center drill must deviate from the workpiece rotation center, only when the center drill aligned with the workpiece rotation center, can be used for drilling center hole operation, that is, must use the symmetrical cross center line or detection of the workpiece on the bus and the side Bus, so that they are parallel with the lathe guide, so as to find the workpiece, the workpiece axis coincides with the spindle center of rotation.

　　4)In supporting the most high precision workpiece surface, in order to prevent the bearing claws wear workpiece surface, should be in the center frame between the bearing claws and bearing surface pad layer of pure copper or fine sand cloth, the back of the abrasive cloth should be affixed to the workpiece surface. Machine parts When the surface of the workpiece has a keyway or notch, you can use brass rings installed on the workpiece surface, as the center frame of the bearing surface.

　　5)Lubricating oil is often added to the bearing jaws to lightly support the jaws for wear.

　　6)Check the wear status of the support claw at any time, the support should be adjusted when loose.