| Simple
indexing on a milling machine is done through the use also a
plain indexing head or universal dividing head. This process of
indexing involves the use of a worm, crank, index head, and worm
wheel. The worm wheel usually carries 40 teeth, with the worm is
single-threaded. Thus 40 turns of the crank will rotate the head
one revolution One complete turn on index crank cause spindle and work to rotate one-fortieth of a turn (ratio of 40:1) Calculate number of turns of crank simply divide 40 by number of divisions to be cut |
| The indexing required to cut eight slots? | |
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The indexing
required to cut seven slots? |
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| The five-sevenths turn involves use of index plate and sector arms. | |
| Index
plate Circular plate provided with series of equally spaced holes into which index crank pin engages Sector arms Fit on front of plate and may be set to any portion of a complete turn |
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| Finishing Indexing for Seven Flutes | |
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