1.0 05/05/2013
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Beware of Hand Injury. Beware of Foot Injury by Nails. Must Wear Helmet. Protect the environment.
2.3 Danger in Operation
2.3.1 Safe Operation of Lathe Chuck
There must be an obvious marking of the highest safe rotation speed posted on all the
workpiece clamping devices and the spindle rotation speed shall never exceed this rotation
speed. It must be pointed that the highest safe rotation speed marked is generally assumed to
be a speed under the ideal working conditions. In the following cases, lower spindle rotation
speeds shall be selected for use.
a. Use the chuck to clamp the workpiece under noisy working conditions.
b. If there is an exact damage in the chuck, it is dangerous to rotate under the
high rotation speed, especially when a chuck of grey cast iron matrix is used, there may
be a crack caused in the damaged point.
c. The clamping force required is not known before clamping.
d. All of these factors, such as the strength of the workpiece to be clamped, the clamping
surface and the balance of the workpiece shall have a larger impact on the highest safe rotation
speed that can be used.
When the workpiece is rotating, it can not be clamped tightly possibly because of the
impact of the centrifugal force, which contains the following elements
：
a. The rotation speed used is too high.
b. The weight and type of the jaws used are not standard ones.
c. The working radius of the jaws is not right.
d. The lubrication conditions of the jaws are poor.
e. Poor balance status.
f.
The clamping force used has not taken the dynamic factor into consideration.
g. The cutting force is too large
