[78-L] One or three holes?

[Robert M. Bratcher Jr.]

They may have been made for home & semi pro use on a cutting lathe that has the proper center spindle for 45 rpm.


From: David Lennick <dlennick at sympatico.ca>
>To: 78-L Mail List <78-l at klickitat.78online.com>
>Sent: Thursday, June 30, 2011 5:03 PM
>Subject: Re: [78-L] One or three holes?
>
>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!)
>>>>>
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