5699-E P-(ii)
SAFETY PRECAUTIONS
2. Before Turning on the Power
• Make sure that the doors to the operation panel and the electric control cabinet are closed.
• Make sure that there are no obstacles around the machine.
• Turn on the main power disconnect switch before turning on the CONTROL on the operation
panel.
3. Chuck Precautions
• Always close the front shield before starting the spindle or cutting operations.
• Always observe the spindle speed maximums for the installed chuck.
Never run the spindle exceeding the maximum allowable chuck speed.
• If a chuck or fixture is unique to your application, check the maximum allowable spindle speed
and stay within the limit. Also, take note of the workpiece gripping force and balance.
• The maximum spindle speed can be limited by inputting a G50 command with the spindle
speed. The G50 command helps to ensure safety in operation.
• If the spindle must be rotated close to the maximum allowable chuck speed, observe the follow-
ing points:
The maximum allowable spindle speed and application pressure are indicated on the name
plate on the front shield and on the chuck body. The allowable maximum speed and the applica-
ble pressure ensure a chucking force that is more than one-third over the original chuck grip-
ping force with the standard soft-top jaw set in line with the periphery of the chuck body.
a. Make sure that the workpiece clamped in the chuck is balanced.
b. Apply the allowable maximum amount of pressure to grip the workpiece because centrifu-
gal force reduces the chuck gripping force.
• If special jaws (larger than standard soft-top jaws) are used, observe the following points:
a. Lower the spindle speed because centrifugal force and lower efficiency reduce the chuck
gripping force.
b. If the jaw tightening nut (jaw nut) is outside of the periphery of the chuck, only one tighten-
ing bolt is holding the jaws in place. This is a potentially dangerous condition. Jaw nuts
must always be within the periphery of the chuck.
c. Machine the jaws to the workpiece shape.
• Securely tighten the bolts on the chuck body, the jaws, and the block to the specified torque.
Use lubrication oil. Make sure that the torque is at least 392 to 490 N (88 to 110 lbf).
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