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7. Malfunction and Countermeasures
7-1. In the case of malfunction
Check the points specified in the table below and take the appropriate countermeasure.
Table 9
Defective
Cause
Countermeasure
The chuck inside will break.
Disassemble and replace the broken part.
The chuck
does not
operate.
The sliding surface is seized.
Disassemble, correct the seized part with oilstone, etc., or replace the part.
A large amount of cutting powder is inside. Disassemble and clean.
Handle rotation is
hard.
Rust occurs at slide part and rotation part. Disassemble and clean.
The gripping force is insufficient.
tighten at the specified handle torque.
The forming diameter of the top jaw is not
consistent with the work diameter.
Form again based on the correct forming method.
The cutting force is too large.
Calculate the cutting force and check that it is suitable for the specification
of the chuck.
The Work
slips.
Insufficient grease lubrication
Supply grease from the grease nipple, and open and close the jaw several
times without gripping a work.
The outer periphery of the chuck is
running out.
Check the end surface run-out and the outer periphery, and retighten the
chuck attaching
bolts.
Foreign matter is caught in cross key part
between base jaw and top jaws. jaw
attaching bolts are inadequately tightened.
Remove top jaw and clean cross key part thoroughly and tighten bolts to
specified torque.
The forming method of the soft jaw is
inappropriate.
Check that forming plug is parallel to chuck end face and plug is not
deformed due to gripping force.
Precision
failure.
The height of the top jaw is too high, the
top jaw is deformed, the top jaw
attaching
bolt is elongated.
Do not use the jaw that is higher than a standard.
Summary of Contents for JN N Series
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