[78-L] One or three holes?

[David Lennick]

I may still have one or I may have purged it last year..can't remember whether 
it looked as if it had had a punch-out or not, but I can't imagine a 
professional cutting engineer wanting to cope with the variable size of a large 
center hole on a blank. Playing the stupid things is enough of a pain.

dl

On 6/30/2011 4:06 PM, Robert M. Bratcher Jr. wrote:
> I saw a few 7" Audiodiscs with no label on them several years ago&  all had the proper 45 rpm center hole.
>
>
> From: David Lennick<dlennick at sympatico.ca>
>> To: 78-L Mail List<78-l at klickitat.78online.com>
>> Sent: Thursday, June 30, 2011 2:26 PM
>> Subject: Re: [78-L] One or three holes?
>>
>> By the way, there WERE 7-inch lacquer blanks made by Soundcraft with a
>> punchable center hole for the 45 spindle..found an ad for them in a 1953 High
>> Fiddledeedee.
>>
>> dl
>>
>> On 6/30/2011 3:17 PM, Martin Fisher wrote:
>>> Three holed urban legend.  These are erroneously referred to as "punch
>>> marks" by misinformed Elvis devotees who believe the pressing machine made
>>> them while extracting the finished 45 rpm records!
>>>
>>> Tee hee
>>>
>>> MF
>>>
>>> -----Original Message-----
>>> From: 78-l-bounces at klickitat.78online.com
>>> [mailto:78-l-bounces at klickitat.78online.com] On Behalf Of Milan P
>>> Milovanovic
>>> Sent: Thursday, June 30, 2011 2:08 PM
>>> To: 78-L Mail List
>>> Subject: Re: [78-L] One or three holes?
>>>
>>> Thank you so much for explanation!
>>>
>>> Best wishes,
>>>
>>> Milan
>>>
>>>
>>> ----- Original Message -----
>>> From: "Graham Newton"<gn at audio-restoration.com>
>>> To: "78-L Mail List"<78-l at klickitat.78online.com>
>>> Sent: Thursday, June 30, 2011 1:51 AM
>>> Subject: Re: [78-L] One or three holes?
>>>
>>>
>>>> Milan P Milovanovic wrote:
>>>>
>>>>> not so while ago, the discussion about details of lathes raised. I came
>>>>> across this record sample
>>>>
>>>>> http://youtu.be/tc2FrjRa9Os
>>>>>
>>>>> It is clearly visible only one hole mark besides spindle. I always
>>>>> thought that one additional hole on lacquer was reserved for amateurish
>>>>> type media and three additional holes for professional blank samples.
>>>>>
>>>>> Someone knows what's in case here? Why is there only one? Could it be
>>>>> possible that recording engineers used semi pro or amateur recording
>>>>> blanks?
>>>>
>>>> It depends on the type and design of the recording lathe.  The extra hole
>>>> or
>>>> three holes are drive holes to engage with a single (usually spring
>>>> loaded) pin
>>>> to prevent the lacquer disc from slipping as it is being cut for the
>>>> master.
>>>> Why some lacquers were supplied with three holes is a mystery, since I
>>>> never
>>>> encountered anything where more than one hole was needed.
>>>>
>>>> All home use disc cutting machines used discs with at least one drive
>>>> hole.
>>>>
>>>> Many professional mastering lathes like Scully and Neumann used lacquers
>>>> with
>>>> no drive holes, only the center pin, and it was hollow to allow vacuum to
>>>> be
>>>> conducted under the turntable platter to hold the lacquer flat while it
>>>> was
>>>> being cut.
>>>>
>>>> Lathes like Presto, RCA Victor and others found in broadcast studios
>>>> mostly
>>>> used lacquers with the drive hole since it was much cheaper to make a
>>>> non-suction-hold-down turntable.
>>>>
>>>>
>>>>
>>>>
>>>> ... Graham Newton (RCA Victor disc mastering engineer in a former life!)
>>>>