VACUUM BASE is supplied vacuum from an air generated venturi, giving the base 110kgs of holding power to a clean flat surface.  It can be operated with a small compressor, providing it can supply 450kPa (65psi) pressure continuous, when operating with an electric or battery drill. Maximum pressure of 60kgs can be applied to the surface being drilled. When operating with an air drill, the compressed air flow has to be of maximum pressure of 700kPa (100psi) and the base has a port available, controlled by a safety valve which only allows air to flow to the air drill when the base is firmly fixed to the surface to be drilled. Standard carriage configuration gives an operating travel of 280mm from base of chuck to surface and with the carriage inverted, it gives 380mm.  Carriage is operated by a rack and pinion with 13:1 ratio. The drilling mast is able to be moved left or right by 15° to get into difficult areas. With an air drill fitted – the unit can be used underwater. Battery Drill Attachment requires a torque arm which fits to the side of the carriage, utilising the belt clip attached to the battery.   For different types of drilling, there are three kits available:- Kit #1 – drill chuck – for standard drilling with twist drills, holesaws, thread tapping etc. Kit #2 – mini cutter arbour – to accept Drillmate Mini Cutters from 8mm-25.5mm dia. Kit #3 – to accept broach cutters with 19mm shank and a DOC up to 35mm and 40mm Dia.