How to determine the direction of the spiral and the direction of the axial force of helical gears?
The axial force of the driving gear left with your left hand, right with the right hand, four fingers to the rotation direction of the gear, the thumb is the axial force direction, if the tooth is used with passive rotation to the opposite hand, the axial force or from engaging with the driving gear and the direction of action and reaction.
Helical about my experience is that you will judge the gear face down, left or right to see teeth is high high, high, high - left, right right
The worm is a disguised form of gear, composed of worm gear, advantages in a transmission under high transmission ratio, and also disadvantage is the self-locking self-locking worm, in general, low efficiency, and is generally expensive gear made of copper alloy. The gear transmission can be regarded as some gear and worm gear. This is the number of teeth, some head worm. Simple words, you use a suitable screw and a gear to make the worm drive, but the actual contour curve of the worm drive is very complex.
