The Precision Development Facility (PDF) was originally established within RAL Space’s Millimetre Wave Technology Group to provide the very high accuracy machining required for the development of sub-millimetre wavelength receiver technology. However, in addition to this close project support role, it also undertakes development work for industry and a variety of government institutions. Recent investment in some of the very latest CNC machine tools has enhanced its capabilities, maintaining its position as experts in all aspects of precision machining and novel component prototyping.