I really don't want to spoil your day but you may not have bought the right machine for the job.It might be faster and more effective to send the graphite out for water jet cutting.It will get done faster and the water jet is a much better assurance that the graphite dust won't get into electrical enclosures and cause mayhem.I don't really see why it was taking a long time to cut 2mm graphite by hand as it is a fairly soft material and ought to yield very quickly to a sharp hacksaw,certainly more quickly than a tiny CNC router would do the job.If,in the nature of overcoming a challenge,you move along the path to independent machining of your electrodes you will need to develop some facility with CAD/CAM systems and sort out workholding and good extraction.There are various guides online on the topic of building downdraught extraction benches and that might also be a good field to explore.I doubt that any person on this forum has a circle of family and friends that has had no incidences of cancer and I would like to wish you great success with your research.