How to choose the rack and pinion fit to make zero backlash tolerance? It is impossible to achieve a 0 backlash fit for a helical rack and pinion by selecting the tolerance at the time of design. The purpose can only be achieved by designing an adjustment mechanism (adjusting the center distance), which necessitates the fitter to determine whether to achieve a 0 backlash fit based on the actual assembly situation using various detection methods or gear backlash experience. The general gear-related fit is impossible to match with 0 backlash, and there is not much practical significance (because the gear is in line contact during the torque transmission process, there is a certain amount of wear and tear after running for a period of time). Adjustable gear bases and eccentric shafts (wheels) may be built to offset or compensate for clearance.
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