Here as an example, are some key points regarding machining of an aluminium part using Poly crystalline Diamond (PCD), Chemical Vapour Deposition (CVD) and Single Crystal Diamond (SCD).

• A PCD turning tool could achieve a surface finish of between 1.30µm to 0.38µm. • A CVD turning tool could achieve a surface finish of 1.30µm to 0.20µm. • A SCD turning tool could achieve a surface finish of better than 0.1µm. • With the PCD tool the part would require polishing to achieve a bright finish. • With the CVD tool the part would require a lot less polishing time to achieve a bright finish. • With the SCD tool the part would have a mirror finish without the need for polishing. • A PCD tool could rough cut the part. • A CVD tool could rough cut the part. • A SCD tool is only suitable for finishing cut of less than 0.5mm. • A PCD grooving tool would require the part to be de-burred after machining. • A CVD grooving tool would require the part to be de-burred after machining (but less compared with PCD). • A SCD grooving tool would require no de-burring of the part. • A PCD tool is relatively cheaper to purchase than a CVD or SCD tool. • A CVD tool is 2-3 times the cost of a PCD tool but came be run at higher cutting feed rates and in some cases with no lubrication. • A SCD tool is 4 times the price of PCD but can reduce operating costs by removing de-burring or polishing processes.

Therefore each different diamond material has its place in machining materials.  Materials that diamond can machine . NON FERROUS MATERIALS For more independent information on diamond materials and their properties why not visit the DeBeers web site at Element Six.com