C
colin
- Jan 1, 1970
- 0
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 =^.^=
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 =^.^=