[ARSCLIST] Centering the Disc----Re: [ARSCLIST] My response to--Re: [78-l] Viva vinyl

[Nipper <nipper@xxxxxxxxxxxxxx>]

Hurrah DL!!  Don't enlarge the hole if you care about the artifact.  Some
folks don't care.  Some folks will never handle MY records!!

Slap on an extra mat or two to get the disc above the spindle's "tight
zone".

Set it in motion and track it.

Watch the cartridge for eccentricity.  If it wobbles, nudge the disc at the
edge WHILE SPINNING with some appropriate object until cartridge stands
still.  I like to use my Discwasher stylus brush.  You might want to stop
the platter at this point and add a weight to the label area for stability.

I've heard of some folks checking the rotation, stopping the platter and
moving the disc around by hand but that's the hard way.

Martin

----- Original Message ----- 
From: "David Lennick" <dlennick@xxxxxxxxxxxx>
To: <ARSCLIST@xxxxxxxxxxxxxxxx>
Sent: Friday, June 09, 2006 10:23 PM
Subject: Re: [ARSCLIST] My response to--Re: [78-l] Viva vinyl


> Lani Spahr wrote:
>
> > --- phillip holmes <insuranceman@xxxxxxxxxx> wrote:
> >
> > > Lani,
> > > How do you get the record centered once you've enlarged the spindle
> > > hole?
> >
> > Well, it's easier seen than explained, but I'll try.
> >
> > First file out the center hole with a rat-tail file or reamer.
> >
>
> Okay....first of all....DON'T DO THAT! The reasons should be obvious, but
> they'll include potential damage and cracking, shavings all over the
place, and
> most important of all, it may not be your record you have to center.
>
> Better to raise the disc with an extra turntable mat or two..I use a mat
and an
> old thick LP. For really badly centered records I add a lightweight flat
disc
> (flat is very important..this is why old LPs made before "gruve gard" come
in
> handy, and the lightweight flat disc is a 1940 vintage paper-based
lacquer).
> This gives you enough room to center the disc properly with most spindles.
I
> then use a record weight (stolen from an old radio studio, which I realize
is
> not an option for all, but I'm sure you can come up with something). This
is a
> more difficult task to do on some turntables than others, and best
performed on
> tables designed for production use and which allow cuing.
>
> Back to Lani.  dl
>
> >
> > I've got a light clamped on the TT shelf that illumates the LP grooves
> > from behind the arm. The light is mounted at about a 30 deg angle so
> > that when you view the LP from the front the grooves appear as bright
> > and dark lines. Start the TT spinning and position the arm over a
> > bright set of grooves that are fairly stationary.  Using the needle for
> > a reference (and closing one eye) it's easy to see the grooves wobble.
> > Get close or use a magnifying head piece (like hobbyists use). Then
> > when the grooves move to the right I tap the edge of the LP to the
> > left. When they stop wobbling you're centered. I can do it fairly
> > quickly now. If they're extremely off center you may have to reream the
> > center hole and start again.
> >
> > Hope that's clear. :-)
> >
> > Lani
> >
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