Problem originated from day shift. The grinder would start and run until parts were put into it. After which contactor would begin to chatter (such as coil dropping out). Normally the most frequent problem with these grinders can be traced to the safety circuit switches. In this case I could find nothing wrong with any of the control components. After watching it in operation. ..I discovered one of the control fuses off the transformer was arcing and incorrectly mounted to where it was just barely making contact. I checked the fuse and found it to have changed resistance value. I replaced it and made sure the others were installed correctly. No further problems.
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