A brake disk for a disk brake, in particular, for motor cycles or bicycles, includes a brake band of a first material which has a high heat resistance and an inner part of a second material which has a lower density than the first material. Second exposing of radiation to the removal areas is conducted to be effective to change photoresist solubility in the developer for the photoresist to be cleared from the removal areas upon develop with the developer. The primary air supply can be used to cool a space, such as an office, where low humidly is desirable. A proximity switch or sensor located downstream of the cutting station signals a controller each time the wire reaches the desired length to periodically generate an electrical current to the electrical motor for selectively intermittently driving the motor at a relatively high frequency corresponding to the frequency at which wire cuts are made.