I'm interested in these...they look good for adding axis' to my machine . As it happens I've just been designing it today, but with a double timing belt reduction to get the required torque. These gearboxes would simplify it.

The output torque is sufficient with the 25:1, however the backlash according to their website is <19 arcmin on the output shaft. At 25:1 that's upto about 8 degrees on the input shaft - seems like a lot, am I reading it wrong?

http://www.neugart.de/download/gb/PLE/dim/PLE_40_gb.pdf

http://www.neugart.de/download/gb/PLE/Katalog_PLE.pdf