Here is some stuff from machining Handbook that may help you, it's mainly for composite but you'll see that the faced problesm are the same.
Some general guidelines for machining of carbon/epoxy composites are the following:
Carbon/epoxy is abrasive by nature. Therefore, precautions should be taken to ensure that the carbon/epoxy particulate does not propagate into the precision machine/ground ways of the machine tool. The carbon/epoxy particulates can cause not only premature tool wear but machine wear as well.
Carbon/epoxy dust can cause electrical components to short out or malfunction. All electronic components should be tightly sealed and have filter systems installed to prevent problems. Since thermoplastic composites generally form chips rather than particulates, electrical problems have not been experienced with these materials.
The aforementioned machining processes can be completed dry (with vacuum) or wet. When machining dry, a vacuum system must be used to collect the dust particulates to prevent them from becoming airborne. The vacuum system normally used is an ultrahigh-efficiency cartridge- type dust collection system providing capacity of 8.5 m3/min (300 ft3/min, or CFM, at an external static pressure of 7.5 kPa at 20 °C (30 in. H2O at 70 °F) with an overall efficiency of 99% down to a 0.5 ?m particle size. Even with this high efficiency system, it is imperative to remain vigilant of heat buildup or baking of the carbon epoxy particulate to the cutting tool. This problem can cause catastrophic part failure due to degradation and delaminations.
Enhanced tool life results when these operations are accomplished wet. Typical coolants are tap water or Bio-Cool 500 (Westmont Products, Dallas, TX) mixed at a 20-to-1 ratio, applied as flood. Another very important point for consideration is how the coolant will be recirculated during the machining processes. If the machine is not going to be dedicated to carbon/epoxy machining, then every consideration should be given to an auxiliary tank. This will prevent contamination of the coolant tank of the machine, an important point because dust particulates and not a chip form are generated during machining. The particulates form a sludge clogging filters and impeding coolant flow.
If the machine is not dedicated and an auxiliary tank will be used, the tank should be designed to provide a sludge and filtration system that will ensure adequate particulate-free coolant to be delivered to the cutting tool. This type of system will prevent contamination of the primary coolant delivery system of the machine and will also prevent severe corrosion to internal components.
