[PattyW]

Good morning,
I perform regular oil analysis on the equipment in the shop and I have one Okuma lathe that has an increase of dissolved copper in it. Within a matter of 6 months, the copper has gone from .28ppm copper to 75ppm. The jump is somewhat concerning, although there isn't any marked increase in the other wear metals in the oil. I'm trying to find out where in the system the copper could be coming from. The operator stated some prototypes were ran at the beginning of this 6 month period with a lot of tool breakage. The equip does not have an external heat exchanger, and I don't believe it has one built in within the machine panels. Does anyone have any advice? Thanks!

[Algirdas]

it can be a coolant nozzle. Maybe there are some copper containing grease used in some bearings?