Obviously, it has been a very attractive idea to model the roll test in computer environment by skipping the necessity to have a very expensive and time -consuming cutting and testing equipment. But it had its own challenging issues:

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It requires the computer models for each type of gear cutting equipment and methods of cutting to develop the working surfaces;

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Models developed for each member should be brought together and be rolled like in real conditions;

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Computer system should be capable to handle the amount of computation to get results in a reasonable time.

With a progress in computer industry this analytical (off-line) method of gear’s evaluation has become a complimentary (not competing) product to already existing “real” roll test called Single Flank Test (SFT).

Based on analytical representation of the working surfaces for gear and pinion and the estimated mounting conditions this method is capable of prediction the amount of transmission error and showing the contact between two surfaces during such a virtual roll test.