| 摘要 |
An inexpensive machine of small size is exclusively used for processing a key groove, requiring no skill. It is so constructed that a voltage is applied to an insulated work table through lead wires. A piece to be processed is reciprocated in left- and rightward directions. A center position of processing is calculated, based on digital displays of conduction signal positions, which left and right contact positions of a cutting tool inserted into a throughhole, in an inner wall of which the key groove should be formed, with the inner wall and a position of processing is set for the cutting tool by means of a scale, which position is fixed by using an eccentric lever. The work table is moved automatically intermittently with a cutting pitch set, linked with an air cylinder. A cutting distance for the key groove is set by a separation distance s between two magnetic sensors and cutting of the key groove K having a depth d is effected by moving the work table intermittently backward in a region, at two extremities of which the two magnetic sensors respond, respectively, to a magnet base, which is formed in one body with the work table.
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