The worm shaft carrying the crank has a single-threaded worm which meshes with worm gear having 40 teeth, 40 turns of the crank are necessary to rotate the index head spindle through one revolution. It is more accurate and has a large range of indexing than rapid indexing.įor indexing, the dividing head spindle is turned by the index crank. Simple indexing is also called as 9 indexing.
To Find the index movement, find the total number of holes in the direct index plate by the number of divisions required in the work, If N is the number of divisions required on the work then, With a Rapid indexing plate of 20 holes, it is possible to divide the work into an equal division of 2,3,4,6,8,12 and 24 parts which are all the factors of 24. When the plate is turned through the required part of the revolution, the dividing head spindle and the work are also turned through the same part of the revolution. The spring-loaded pin can be pushed into any of the holes to lock the spindle with the frame.įor indexing, the pin is taken out first and then spindle is rotated by hand, and after the required position is reached it is again locked by the pin. The required number of divisions on the work is obtained by means of the rapid index plate which is fitted at the front end of the spindle nose. When using the Universal head, the worm and worm wheel are first disengaged. This operation can be done in both plain and universal dividing head. The direct indexing is also called Rapid indexing, and it is used when a large number of pieces are indexed with a small division. There is a total of 5 Indexing Head Methods: The indexing can be achieved by using a special attachment known as dividing head or index head. The indexing head can also be used for producing a square or hexagonal bolts, cutting splines on shafts, fluting drills, taps, reamers, etc. While cutting the spur gear, an equal spacing of the teeth on the gear blank is performed by indexing. The indexing head is the operation of dividing the periphery of a workpiece into any number of equal parts. There is a total of 5 Indexing Head Methods: Indexing Head Definition:.
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