The Key Correlation Between Plastic Gear Modification and Rack Tool Tip Modification

In order to decrease the defects of the plastic gear design and manufacturing appears increasingly, the correlation between plastic gear modification and rack tool modification are ratiocinated based on domestic and abroad information. The question whether rack tool modification effects plastic gear modification during the manufacturing is discussed, and the maximum tooth root fillet modification theory is proposed. Finally, the trial-error theory is applied to resolve minimum tip thickness problem for small gear, which validity is verified by applying this theory on the design analysis of helical gear.