Reason for Deviation in the Transversal Pitch Diameter Variance of Gear Machining

Excessive backlash in the worm gear or installation errors causing operational eccentricity.

2. The fit between the roller holder and the column guide rail is too loose, and the镶条and pressure plate have worn down. This causes the roller to exceed its movement precision during feeding, resulting in the variation of the gear's addendum length being out of tolerance.

3. The workbench's centering conical guide rail and lower pressure plate have worn, resulting in excessive clearance between the workbench and the sliding saddle, causing the workbench to drift and be unstable during movement.

4. Axial movement beyond tolerance can also cause this error after the wear of the thrust washer on the rolling tool's main shaft.