| 摘要 |
A cutting tool is carried by a carriage which is slidably engaged by a rotatable body connected to a drive shaft so that the body and carriage rotate together to perform boring and facing operations. The rotational movement of the body relative to a reference member produces transverse sliding movement of the carriage relative to the body, thereby increasing the diameter of the circular path followed by the cutting tool. The ratio of transverse movement of the carriage to rotational movement of the body can be altered by rotating the reference member. A mechanism which includes a plurality of carriage stops is provided for arresting the transverse movement of the carriage. This mechanism is indexed by the movement of the carriage to bring successive stops into operative position in sequence. |
