Just realized my coolant mix was off after a weird finish on a batch of 6061 parts
I was running a job for 50 aluminum brackets at the shop in Springfield last Thursday. The surface finish on part 15 started looking hazy and rough, almost like it was galling. I checked the tool, feeds, and speeds first, but everything was set right. Then I dipped a refractometer in the sump and saw the concentration was way low, like 3%. I'd topped off the tank with straight water earlier by mistake. I shut it down, mixed in the proper coolant, and ran the rest of the batch fine after cleaning the machine. Has anyone else caught a coolant issue by the finish before the tool actually failed?