Hi, I gues this may be kinda off topic, but I have an optical encoder at the end of a 5mm dia 1M long shaft, unfortunatly the bearings in the shaft create some drag and this gives rise to a twisting force wich although small - gives an error of about 1 minute, im trying to get rid of it at the moment im using ordinary ball bearings, the shaft speed is also quite high, ~ 10krpm
I thought of a few possibilities so far :-
1) frictionless bearings, well almost such as magnetic or air or fluid etc, 2) one shaft inside another, joined at the transmiting end, so inner shaft shouldnt be subjected to all the drag.a larger shaft might be stiffer but would need stiffer bearings too probably.
plus this is getting a bit beyond the ablities of the rather limited workshop facilities I have at hand, ie a drill and a vice.
any other ideas ? (obviously I cant move the encoder closer to the other end or I would have done this already)
Colin =^.^=