ABSTRACT
The use of hand tools can be separated into two groups namely power assisted, including rotary burrs, rasps and files, mounted abrasive points, cylindrical grinding wheels and hones, flexible abrasive wheels and brushes, and
filamentary brushes, and non-power assisted, including files, scrapers and abrasive cloth. Hand-held power tools can be driven by electric motors, via flexible shafts, or by compressed air. Generally, air tools are used at operating speeds between 15,000 and 100,000 rpm with electrically powered devices used for tools requiring slower speeds but greater torque. However, slow speed/high torque air guns may be used where electric power is not available or undesirable, whilst hand tools are available where small electric motors are contained within the gun, thus negating the requirements for a flexible shaft, which can operate at speeds well in excess of 15,000 rpm.
