Tests to investigate various aspects of machining have been carried out at The College of Aeronautics on a billet of Titanium - 150A,hot forged by High Duty Alloys. Measurements were made of the drilling forces, and an investigation of the cutting force when turning the blank was made. Tests were also made to determine the effect on tool life of tool shape, cutting speeds, of various rates of feed and of cutting lubricants and coolants.