The 2 half worms and worm wheel is the highest accuracy worm gears concept
When it comes to highest possible accuracy and precision , such as worm gears for rotary table, backlash becomes the major fear. To reach the excellence OTT developed worm and worm wheel gears set that runs without backlash.
Due to the large number of teeth engaged and to high teeth height, driving torque is important while rotation speed stay very constant. When gear ratio is optimized, it can reach high rotation speed. It can be selected several feet on the worm. The low rack angle value eliminate toothing error or eccentricity of the wheel.
Calories are evacuated through the rear flank.
Available distances axes are between 50 and 500 mm.
The OTT "two half worms" design offers better accuracy than a duplex system. Originally OTT designed this ant-backlash concept as worm gears for rotary table, it’s now used in various kinds, such as telescope, control, wind turbines...
Driving into rotation through 2 half worms, also known as “splitted worm gear”, a shafted worm, and a hollow worm fixed on the shafted worm.
Each half worm drives in only one direction.
Therefore the rear flank of the worm is never touching the worm wheel. OTT designed its shape to offer better strength the tooth and, and evacuate calories.
By limiting thermal dilatation and friction the worm gear structure offer immediate benefits such as better longevity and better accuracy.
Therefore this worm gears system fits very well for rotary table applications.