D
Exactly. Say your original procedure required that you change the tip every 1000 spots, and you kept getting various failures. You began to measure some aspect of the welding and discovered that you see the rate of failures increase dramatically after 600 spots. This is predictive maintenance, measuring the criteria and determining that you need to change the tips before this dramatic change.
If this is consistent, you can then set a preventive maintenance program for every 500 spots. Thus, the preventive maint. program is a result of some previous predictive maint. program.
If this is consistent, you can then set a preventive maintenance program for every 500 spots. Thus, the preventive maint. program is a result of some previous predictive maint. program.