Worm and worm wheel running backlash free - OTT 2 half worm concept distributed by allytech

OTT Worm Gears backlash free

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...

OTT Design : worm gears without backlash

OTT worm gears without backlash advantages

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.

following the DIN 3974 requierments OTT controls each tooth with high precision.

The 2 half worms and worm wheel is the highest accuracy worm gears concept

Worm and wheel gears running without baklash. The innovative OTT concept offer the best solution to eliminate backlash. This concept is used a lot in any worm gears for rotary table application

- Backlash is easy and fast to adjust. Both gear are axially positioned on the same axis. Then the final adjustment is done by the independent rotation of each worm .

- As the front angle has a low value (around 10°), the backlash can be easily adjusted, reduce to zero or preloaded.

· Heat as no incidence between morning and evening.

· Wheel concentricity errors are eliminated.

· A backlash free adjustment guarantees a very high accurate positioning of the work piece on the machine.

- The teeth height, is around 4 times the module.

· High capacity to drive important torque for milling operation, due to large surface of worm tooth into contact with wheel.

Worm gears without backlash : The gear teeth run between the working flanks of the shank worm and hollow worm ; the rear flanks of both worms are free.
OTT designed this ant-backlash concept as worm gears for rotary table

Large number of teeth engaged with the wheel

· Excellent line of action.

· Toothing errors reduced.

· Excellent indexing accuracy

· Very good cinematic to get a constant rotation speed

· Very good milling surfaces due to no vibration concept

Easy customization of dimension even for unique application and low quantity series

· Ratio can be adapt to increase rotation speed.

· Possibility to select a ratio to get the possibility of a wheel drive or not. (irreversible)

When disassembling the worm gears for product maintenance, you find after reassembling same surface into contact, and therefore get back the original accuracy.

Easy maintenance almost free

· Even after years of intensive use the adjustment is only few minutes. Surfaces in contact remain the unchanged.

· Of course the more you lubricate the easiest the maintenance

Severe controls prior shippment

· On every single gear, each tooth is severely controlled

according to DIN 3974.