The C630 and C620 lathe four-jaw chucks are generally threaded with the lathe spindle, and the outer diameter is centered. When removing the chuck, use a crowbar or a reversing head to loosen the top bar counterclockwise, then remove the chuck. Sometimes the chuck is not replaced for a long time. Under the action of cutting resistance, the chuck flange and the plane of the spindle are tightly attached or even killed. In this case, the above two types are used.
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