To efficiently establish cutting conditions by automatically reproducing once adjusted optimum cutting conditions.

In cutting a work by relatively keeping a saw blade housing 5 having a band saw towards and away from the work W by means of a fluid pressure cylinder 41, the flow rate and pressure of a working fluid for working the fluid pressure cylinder are adjusted by means of a flow control valve and a pressure regulating valve to establish cutting conditions. In rotating a cutting speed adjusting dial 67 for working the flow control valve by a worker to adjust the cutting speed of a cutting tool, a speed adjusting clutch 75 for transmitting the rotation of a speed adjusting motor 73 to the cutting speed adjusting dial 67 is turned off to previously store the rotating position of the cutting speed adjusting dial as setting data on a memory 95. In interrupting an automatic operation, the speed adjusting clutch 75 is turned on to rotate the cutting speed adjusting dial by means of a cutting speed adjusting dial rotating device. Thus, the rotating position is automatically set to the rotating position based on the setting date previously stored on the memory 95.