Determine the still left or ideal hand guideline of the worm wheel relative to the worm. When the worm is right-handed (the worm can be rotated to the 
The worm rotation direction (discussing the direction of the lead angle of the worm itself) is divided into left-handed and right-handed, and both the left-handed worm and the right-handed worm can be rotated clockwise and counterclockwise. There are four instances in total:
1. The worm rotates left, the worm is normally on, and the worm is certainly down. The right hands rotates the worm clockwise, and the worm steering wheel rotates counterclockwise;
2. The worm rotates to the left, the worm can be under, and the worm is usually on. The right hand rotates the worm clockwise, and the worm wheel rotates clockwise;
3. The worm rotates to the proper, the worm is certainly on, and the worm is normally down. The right hands rotates the worm clockwise, and the worm wheel rotates clockwise;
4. The worm rotates to the right, the worm is definitely on, and the worm is down. The right hands rotates the worm clockwise, and the worm steering wheel rotates counterclockwise;
