The difference between the worm gear pair for CNC table and the ordinary worm gear pair is the left and right sides of the variable-lead worm gear.
The two sides on the right have different leads, while the leads on the same side are the same.
Because the tooth thickness of the worm is uniformly and gradually thickened or thinned from one end of the worm to the other end,
Therefore, the variable lead worm is also called the variable tooth thickness worm.
Therefore, the method of axially moving the worm can be used to eliminate or adjust the meshing gap of the worm gear pair.
The meshing principle of the worm gear pair used in the numerical control table is the same as the meshing principle of the general worm gear pair.
The axial section of the worm is equivalent to the basic rack, and the worm wheel is equivalent to the meshing gear.
Although the left and right sides of the worm teeth have different tooth pitches (that is, different moduli), because the tooth pitches on the same side are the same,
Therefore, the meshing conditions are not destroyed, and good meshing can be ensured even after the worm is moved axially.