<P ><B>Jigs are workholders which are designed to hold,locate</B><B>，and support a workpiece while guiding the cutting tool throughout its cutting cycle.Jigs can be divided into two general classifications:drill jigs and boring jigs.Of these,drill jigs are,by far,the most common.Drill jigs are generally used for drilling,tapping,and reaming,but may also be used for countersinking,counterboring,chamfering,and spotfacing,Boring jigs,on the other hand,are normally used exclusively for boring holes to a precise,predetermined size.The basic design of both classes of jigs is essentially the same.The only major difference is that boring jigs are normally fitted with a pilot bushing or bearing to support the outer end of the boring bar during the machining operation. <p></p></B></P>
<P ><B> In designing any jig,there are numerous considerations that must be addressed.Although several of these points,such as locating,supporting,and clamping,have already been covered,they are included in this section because they apply to jig design.Since all jigs have a similar construction,the points covered for one type of jig normally apply to the other types as well.Jig design and selection begins with an analysis of the workpiece and the manufacturing operation to be performed.高手进来帮小妹灌水呀！！！！！！</B></P> |
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发表于 2005-12-15 12:58:00
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