CHAPTER 7: GENERAL DESCRIPTION 7-7
ALPHA ST320 S2
3.3. Rotating sleeve
The rotating joint is mounted on tip of the long pusher and serves to connect static part (pusher rod) and
rotating part (finger chuck). This part decides if both ends of the bar stock rotates at the same speed.
Due to its function, this part becomes the most critical index of bar feed system performance. A bad
rotating joint could results in serious vibration and big noise. The user is strongly recommended to
inspect its status regularly in order to keep the bar feeder running at the best performance.
3.4. Finger component
The finger component is the part to keep the connection between the bar stock and the pusher. When
the lathe spindle is turning, the bar stock is supported by lathe chuck and finger chuck. In order to get a
good support during machining, the finger chuck must be properly selected according to the bar stock
dimension.
Standard type
The standard type, which also called finger chuck, is a cylinder with
flexible jaws that are able to clamp bar stock tip. Each finger chuck
matches a specific bar stock dimension only. For profiled bar stock, the
finger chuck diameter must be selected according to the virtual circle
created by the bar stock corners. Refer to annex table for dimension
conversion.
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