Hi John,

I tried the same setup in September and early October of this year. Try
a smaller ball bearing than the race was made for; that will mean alot less
contact friction. A same size ball bearing as the race, means multiple meta=
l

contacts therein; for both your hinges...and, the different ball
bearing/race
"sections" will have to be set rather precisely (apart) together; otherwise
you get more friction from that (potential offset) stress contact.

I used a more brutal ball bearing "disection" method than you used. A
big vice, will crack small ball bearing assemblys fairly easily, and in
fair alignment with where they contact the vice jaws. Use a cloth, under
and over the bearing assembly before applying pressure. Subsequent
vice pressure can reduce the 1/2 sections, to 1/4 sections fast.

The best ball bearing/s on various mounting surfaces I tried could only
get up to 4 hours of free oscillations, for a 2" mass offset, with it setup
as a hanging vertical pendulum, or S-G. I found that nearly flat ground,
polished glass optical lenses surfaces were better than bearing races
for less friction.

Take care, Meredith Lamb


On 11/5/05, John Popelish  wrote:
>
> ChrisAtUpw@....... wrote:
> > The correct reference is:
> >
> > http://home.earthlink.net/~meredithlamb/crbs.html
> >
>
> All this discussion of using parts from ball bearings as hinge
> bearings, and it finally dawns on me that people ate talking about
> everything except the surfaces that are made precisely as low friction
> bearing surfaces.
>
> clip.....
Hi John,



I tried the same setup in September and early October of this year.  T=
ry

a smaller ball bearing than the race was made for; that will mean alot less=


contact friction.  A same size ball bearing as the race, means multipl=
e metal 

contacts therein; for both your hinges...and, the different ball bearing/ra=
ce 

"sections" will have to be set rather precisely (apart) together;=
 otherwise

you get more friction from that (potential offset) stress contact.



I used a more brutal ball bearing "disection" method than you use=
d.  A

big vice, will crack small ball bearing assemblys fairly easily, and in

fair alignment with where they contact the vice jaws.  Use a cloth, un=
der

and over the bearing assembly before applying pressure.  Subsequent
vice pressure can reduce the 1/2 sections, to 1/4 sections fast.



The best ball bearing/s on various mounting surfaces I tried could only

get up to 4 hours of free oscillations, for a 2" mass offset, with it =
setup

as a hanging vertical pendulum, or S-G.  I found that nearly flat grou=
nd,

polished glass optical lenses surfaces were better than bearing races

for less friction.  



Take care, Meredith Lamb




On 11/5/05, John Popelish <jpopelish@r=
ica.net> wrote:

ChrisAtUpw@....... wrote:
&nbs=
p; >        The correct ref=
erence is:
>
>        <=
a href=3D"http://home.earthlink.net/~meredithlamb/crbs.html">http://home.ea=
rthlink.net/~meredithlamb/crbs.html

>

All this discussion of using parts from ball bearings a=
s hinge
bearings, and it finally dawns on me that people ate talking abo=
ut
everything except the surfaces that are made precisely as low frictio=
n

bearing surfaces.

clip.....