[Dick Pierce[_2_]]

On 1/5/2011 6:54 PM, Trevor Wilson wrote:
wrote in message
...
I have an approximately 10 year old Pro-Ject 1.2 turntable. Over the
last year, the big heavy platter has begun scraping as it spins, and
has finally ground to a halt. If I elevate the platter, by putting a
shim (two old CDs) between it and the sub-platter, that elevates it
enough that it spins again, but with lots of wobble. Obviously not an
ideal fix.

I don't know what's happening, but I'm guessing the sub-platter (which
is what actually spins, driven by the motor/belts) has descended/sunk
a bit.

Has anyone experienced anything similar with this turntable? Is there
any way to fix this problem?

Thanks in advance!

**Common problem with some of the Pro-Ject TTs. The platter sags! Remove the
mat and look at the platter from the side. You will probably note that the
outer rim has saged, relative to the spindle. Cheap, crappy die casting I
guess.

Are you SERIOUS? The platter has sagged? Please!

If the platter was made of butter, yeah, I could believe
is. But even the crappiest imaginable diecast part if
not going to sag except under some pretty extreme loads,
like a stack of a couple of thousand LPs all at once,
maybe. And cheap diecast Al isn't going to sag, it's
going to crack. Aluminum is simply not going to cold-
flow at those loadings. And the loading required to
cause more than micron-type deflections is many orders
of magnitude beyond what you would encounter.

A more likely explanation is something like the platter
bearing mount has slipped, the suspension has sagged or
similar.

But the claim that even the crappiest of diecast platters
has sagged, essentially under it's own weight is, well,
extraordinary.