From my experience, you should add high HLB surfactant or alkonolamide to give better cleaning performance. Normally this problem comes from fully synthetic cutting fluid. Jack

I do not know what metal you are cutting and but you could things a few things. If chips are “sticking” or cold welding to the tooling at the cutting edge then a higher extreme pressure type coolant should be used such as containing chlorinated paraffin or phosphates or Fatty oil. This will stop or reduce chip welding and the resulting scratches on work piece. Also make sure you coolant mix is correct like in the 1-10 or 10% range. If chips are just sticking to the walls of the work piece maybe due to high viscosity coolant or coolant with a high amount of tramp/way oil which will make it sticky and it will hold chips in place. So skim coolant of way lube and make sure it is clean also an extra coolant nozzle maybe needed to “wash” chips out of work area more efficiently. If coolant is just too rich thin it out with some water which may help wash off chips. Bruce Fornesi, CLS