[78-L] VARIABLE MICROGRADE 78

[Kristjan Saag]

Yes, I just saw that Joe S. already pointed this out a few days ago 
(about the pitch).
Kristjan

On 2013-05-07 03:51, Michael Biel wrote:
> From: Kristjan Saag <saag at telia.com>
>> The Variable Micrograde method, patented by Deutsche Grammophon in
>> 1946, had nothing to do with variable pitch. It was the cutting
>> speed that was varied, producing variable distance between grooves.
>
> There are Language problems here.  In Technical English, "Variable
> Pitch" DOES mean variation in the distance between the grooving with
> changes in lines-per-inch. "Cutting Speed" as you use it in this
> circumstance would mean the variation in the rotational speed of the
> feedscrew moving the cutter head forward.  When it turns faster the
> grooving gets spaced wider apart, slower moves them closer together.  In
> all instances the rotational speed of the DISC remains constant!!  Both
> terms are leading towards the same result.
>
> Mike Biel  mbiel at mbiel.com
>
>
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