I am designing a worm drive consisting of a worm driving an internally threaded wormgear to move a concentric non-rotating acme threaded rod. The gear is loaded predominantly in the axial (thrust) direction, so I am considering using thrust roller bearings for the thrust loads and simple bushings for the radial loads, which are light. The issue is that I need to know what tolerance is required on the center distance of the worm/gear set. I have not found any resources containing this information. If a good design book exists (with real usable information -- not just theory) or if you have experience in this area please let me know.
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