[78-L] runout spirals

[Dan Van Landingham]

Milan.Can you give me some information regarding a green and gold series 
Columbia recording I had of
a waltz that was of Serbian origin.The record was purchased my me in 1972 in a 
second hand store in
the town of Weiser(pronounced "wee-zer"),Idaho.The only words in English were 
the copyright dates,
the Columbia label and the words "Serbian music".It was a record I accidently 
broke in 1980 but I loved
the melody which was done by a violin and a guitarlike sounding instrument.The 
tune was tough as it was
in about different themes one of which was in minor..I am guessing it was 
pressed sometime before 1925
as it was acoustically recorded.I learned the song on violin and piano.




________________________________
From: Milan Milovanovic <milanpmilovanovic4 at gmail.com>
To: 78-L Mail List <78-l at klickitat.78online.com>
Sent: Fri, October 8, 2010 9:05:47 PM
Subject: Re: [78-L] runout spirals

Are those eccentric grooves were cut by placing lacquer in those additional 
holes (1 or 3 of them) used for stabilizing locking blanks onto lathe mat 
when cutting? You can put cutting needle anywhere then and make just one 
simple revolution, and voila...

Just a thought...


----- Original Message ----- 
From: "Royal Pemberton" <ampex354 at gmail.com>
To: "78-L Mail List" <78-l at klickitat.78online.com>
Sent: Friday, October 08, 2010 7:06 PM
Subject: Re: [78-L] runout spirals


> I'd think that would be how a lot of eccentric grooves were cut, with the
> disc offset.  The only mastering lathe I've ever seen, a Neumann AM 32,
> actually had a latching arrangement on the underside of the turntable that
> permitted offsetting it to permit cutting eccentric grooves.  (Once upon a
> time, I tried to get the guy who owned the lathe to cut me a disc with an
> eccentric groove at the end but he refused, citing the hassles of getting
> the platter re-centred and perfectly balanced again....)
>
> On Fri, Oct 8, 2010 at 5:40 PM, Michael Shoshani 
> <mshoshani at sbcglobal.net>wrote:
>
>> On Fri, 2010-10-08 at 08:53 -0700, DAVID BURNHAM wrote:
>>
>> > There are two possibilities - either the recording
>> > stylus, after the music is finished, is activated by a cam to go 
>> > through
>> the
>> > eccentric groove motion to create the trip groove, and then moved ahead 
>> > a
>> > millimetre or so and so activated again, or, the recording stylus
>> disengages and
>> > a separate cutter, mounted on the same assembly is brought down to
>> engrave the
>> > trip eccentric.
>>
>> I'm thinking the separate machine theory as well, but here's the kink in
>> the works: the eccentric grooves on VEs are different sizes. If the dead
>> wax is larger, the eccentric pair is really large, but if the dead wax
>> is small, the eccentric pair shrinks. If they used a cam on one of their
>> machines, it would have to be adjustable in some way.
>>
>> Early Capitols and I believe some early Deccas are cut with an eccentric
>> runout spiral. This would indicate shifting the wax or lacquer disc
>> somewhat while the spiral and locked groove were being cut, I think...
>>
>> MS
>>
>>
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