This is a simple illustration of how important it is to review the gearing ratio that is between the load and the output shaft of an indexer.

Your machine has a fixed payload. It is

•a rotary table (driven element),
•with an operating stroke of 270° per step,
•with a maximum torque of 100 Nm.

Since an indexer with a Number-of-Stops = 1.333 is not available, you must apply a gearing ratio between the table and indexer. Let us look at two solutions that use two different pulley size ratios:

Indexer-Drives

SOLUTION 1

•2 station indexer
•A transmission ratio of 3:2 between the indexer output element and rotary table.

The index angle of the indexer output element  is 180° per step.

The Gearing Belt and Pulleys increase the output to 270° per step at the rotary table.

The total torque at the indexer output element : 100 Nm × 3 ÷ 2 = 150 Nm

Indexer-Drives2

SOLUTION 2

•1 station indexer
•A transmission ratio of 3:4 between the indexer output element and rotary table.

The index angle of the indexer is 360° per step.

The Gearing Belt and Pulleys reduce the output to 270° per step at the rotary table.

The total torque at the indexer output element : 100 Nm × 4 ÷ 3 = 75 Nm

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