The use of an electric handsaw or band saw is quite appropriate for cutting discs from small diameter logs, i e. less than 150 to 200 mm. Diameters greater than 200 mm; however, dictate the use of an electric or gas-powered chain saw. These saws are now frequently equipped with an automatic chain lubrication system which must be cleaned up with a suitable solvent before use. The chain should be resharpened frequently during use to minimize heating.