HI, On some of our cnc's we use a paper like media that rides on top of a chain mesh conveyor. The coolant is filtered across the top of the media capturing oils and small chips and allows the coolant to flow through. Our other machines use long drag conveyors to allow the chips to settle, If someone tampers with the coolant flow to the tank we end up with turbulance and the chips are held in suspension and get sucked up into our priming pumps
See if you can control the flow of coolant and allow the chips to settle if you can't change the conveyor??? just a thought........