Risk Analysis of Coupling Fault Propagation Based on Meta-Action for Computerized Numerical Control (CNC) Machine Tool

Table 4

Meta-actions and corresponding failure modes.

Code	Failure mode
A1	No action
A2	Rising instability
A3	The exchange noise is large
	Inappropriate motion
A4	No action
A5	Rotary Instability
A6	Abnormal sound
A7	Abnormal sound
A8	the exchange noise is large
	Inappropriate rotation
A9	No action
A10	Slow motion
A11	Insufficient contractility
A12	Exchange is not in place
	jamming