Jim Lesurf wrote:

Doesn't anyone use Dindsdale's 'groove pattern' to get the
rotor stabilised
and floating on the oil? Not even Max Townshend?

Dinsdale? Could be a relation of mine. Dinsdales and Ivesons
come from adjacent villages in the Yorkshire dales.

You'd need a heavy oil for grooves to work at such a slow
speed, I would have thought. I've seen reference to "self
pressurising" and "floating" turntable bearings while I've
been looking around, but compared to a ball I guess the
precision machining required would be expensive.

FWIW I just used the oil that Technics supplied with my
TT. Until I lost
the small tube and stopped bothering, erm, about 20 years
ago. Still works
OK when I use it. No idea what it was, but if I needed
some fresh oil I
guess I'd have probably used light grade oil as for sewing
machines, etc.


If the last shot of oil has lasted 20 yrs and is still OK,
then if it ever needs oiling again, wouldn't it be sensible
to use the same type? By what logic might you decide to use
something else?

Ian

In article QFZ9o.13506$qQ6.7489@hurricane, Ian Iveson
wrote:
Jim Lesurf wrote:

Doesn't anyone use Dindsdale's 'groove pattern' to get the
rotor stabilised
and floating on the oil? Not even Max Townshend?

Dinsdale? Could be a relation of mine. Dinsdales and Ivesons
come from adjacent villages in the Yorkshire dales.

Pass.

You'd need a heavy oil for grooves to work at such a slow
speed, I would have thought. I've seen reference to "self
pressurising" and "floating" turntable bearings while I've
been looking around, but compared to a ball I guess the
precision machining required would be expensive.

Given the price of some modern TTs I'd have thought they could afford it.
:-)

FWIW I just used the oil that Technics supplied with my
TT. Until I lost
the small tube and stopped bothering, erm, about 20 years
ago. Still works
OK when I use it. No idea what it was, but if I needed
some fresh oil I
guess I'd have probably used light grade oil as for sewing
machines, etc.


If the last shot of oil has lasted 20 yrs and is still OK,
then if it ever needs oiling again, wouldn't it be sensible
to use the same type?

No doubt... So *if* I had any idea what "type" it was, I'd probably choose
it.

By what logic might you decide to use something else?

Only the practical reality that I have no idea what "type" it was. Using
'logic' to reach a decision also depends on your starting conditions. :-)

But as I said, I've seen no reason thus far to think it needs re-oiling. So
I have no plans to do so. Who knows, by then I may find the old tube of oil
falls out of an ancient box when I am tidying. Looking for one thing is
often a good way to find something else. ;-

Slainte,

Jim

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