Hi all,
there is a way to have a zero backlash rotary table. You may use a patented worm gear.
This is made specifically for high precision rotary table, and well used in the mmk-matsumoto product.
The point is that zero backlash limit the rotation speed, therefore the system can be precisely adjusted to the minimum acceptable backlash.
In some cases you may need fast rotation (backlash) then precise positionning (zero backlash). Therefore the backlash might be adjusted dynamically.
another solution is to use a multiple start shafted worm set with zero backlash. You get a appreciable speed and don't need to adjust backlash dynamically.
here are links to more technical data of these technologies :
1) Worm gears zero backlash for rotary table :
http://www.allytech.eu/index_fichier...dwormwheel.htm
2) backlash adjusted dynamically (called OTT-MATIC):
http://www.allytech.eu/index_fichiers/OTTMATIC.htm
Hope this help anyone.
Clem