Convert a 45 RPM record to Metric

The old 45 RPM (revolutions per minute) vinyl records were called 45's
by everyone who had them.

If we were using a metric system at that time, would they still be
called 45 rpm, or would there be some metric numbers used instead?

I was having this discussion with a few people and no one knew the
answer.....
(Personally, I think they would still be 45 rpm, but I could be wrong).

 

[Taxed and Spent]

On 8/31/2017 9:00 AM, oldschool@tubes.com wrote:

The old 45 RPM (revolutions per minute) vinyl records were called 45's
by everyone who had them.

If we were using a metric system at that time, would they still be
called 45 rpm, or would there be some metric numbers used instead?

I was having this discussion with a few people and no one knew the
answer.....
(Personally, I think they would still be 45 rpm, but I could be wrong).

I think they would be 4.5 drpm.

 

On Thu, 31 Aug 2017 10:59:08 -0700, Taxed and Spent
<nospamplease@nonospam.com> wrote:

I stand by my answer: 4.5 drpm. Surely you have heard of Decca records!

What does the "d" stand for? Is it "D"ecca?

 

[Cursitor Doom]

On Thu, 31 Aug 2017 12:00:46 -0400, oldschool wrote:

The old 45 RPM (revolutions per minute) vinyl records were called 45's
by everyone who had them.

If we were using a metric system at that time, would they still be
called 45 rpm, or would there be some metric numbers used instead?

No difference at all.





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[pfjw@aol.com]

Revolutions per minute remain revolutions per minute in the old or new currency. Minutes and revolutions are neither metric nor SAE, nor Whitworth for that matter. all of them would count turns per time period the same.

There are also 45 rpm records of several diameters, to further confuse the issue for you.

But, each one revolves on the platter forty-five (45) turns per minute (60 seconds).

Note that in common use, RCA-base records were called 78s. Even though Edison discs were, most typically, 84s. LPs (33.3) were sometimes called "33s" but mostly LPs.

I suspect that those who were victims of your discussions were not so much uncertain of the answer as unable to formulate said answer in a way you could understand.

Peter Wieck
Melrose Park, PA

 

[Taxed and Spent]

On 8/31/2017 10:55 AM, pfjw@aol.com wrote:

Revolutions per minute remain revolutions per minute in the old or new currency. Minutes and revolutions are neither metric nor SAE, nor Whitworth for that matter. all of them would count turns per time period the same.

There are also 45 rpm records of several diameters, to further confuse the issue for you.

But, each one revolves on the platter forty-five (45) turns per minute (60 seconds).

Note that in common use, RCA-base records were called 78s. Even though Edison discs were, most typically, 84s. LPs (33.3) were sometimes called "33s" but mostly LPs.

I suspect that those who were victims of your discussions were not so much uncertain of the answer as unable to formulate said answer in a way you could understand.

Peter Wieck
Melrose Park, PA

I stand by my answer: 4.5 drpm. Surely you have heard of Decca records!

 

[Dave Platt]

In article <oo9ih4$ct8$1@dont-email.me>,
Taxed and Spent <nospamplease@nonospam.com> wrote:

>I stand by my answer: 4.5 drpm. Surely you have heard of Decca records!

Owww. May vile vinyl vengeance visit itself upon you.

 

[rickman]

oldschool@tubes.com wrote on 8/31/2017 12:00 PM:

The old 45 RPM (revolutions per minute) vinyl records were called 45's
by everyone who had them.

If we were using a metric system at that time, would they still be
called 45 rpm, or would there be some metric numbers used instead?

I was having this discussion with a few people and no one knew the
answer.....
(Personally, I think they would still be 45 rpm, but I could be wrong).

0.75 rps of course! I think I would call them 3/4 rips for short.

--

Rick C

Viewed the eclipse at Wintercrest Farms,
on the centerline of totality since 1998

 

[Adrian Caspersz]

On 31/08/17 17:00, oldschool@tubes.com wrote:

The old 45 RPM (revolutions per minute) vinyl records were called 45's
by everyone who had them.

If we were using a metric system at that time, would they still be
called 45 rpm, or would there be some metric numbers used instead?

I was having this discussion with a few people and no one knew the
answer.....
(Personally, I think they would still be 45 rpm, but I could be wrong).

0.75 revs per second if you want to be completely non-SI about it?

https://physics.nist.gov/cuu/Units/outside.html

--
Adrian C

 

[Adrian Caspersz]

On 31/08/17 19:38, Adrian Caspersz wrote:

0.75 revs per second if you want to be completely non-SI about it?

https://physics.nist.gov/cuu/Units/outside.html

er, non-non-SI ...

--
Adrian C

 

[rickman]

Adrian Caspersz wrote on 8/31/2017 2:38 PM:

On 31/08/17 17:00, oldschool@tubes.com wrote:
The old 45 RPM (revolutions per minute) vinyl records were called 45's
by everyone who had them.

If we were using a metric system at that time, would they still be
called 45 rpm, or would there be some metric numbers used instead?

I was having this discussion with a few people and no one knew the
answer.....
(Personally, I think they would still be 45 rpm, but I could be wrong).


0.75 revs per second if you want to be completely non-SI about it?

https://physics.nist.gov/cuu/Units/outside.html

Depending on your usage of the info it might be 0.75*(2pi) or

4.712388980385 radians per second.

--

Rick C

Viewed the eclipse at Wintercrest Farms,
on the centerline of totality since 1998

 

[Robert Roland]

On Thu, 31 Aug 2017 12:00:46 -0400, oldschool@tubes.com wrote:

If we were using a metric system at that time, would they still be
called 45 rpm, or would there be some metric numbers used instead?

The metric part of the world also measures time in oddball units. I
think we are stuck with it. Switching to a new system would be
essentially insurmountable.

In the SI unit system, however, the unit for angular velocity is
radians per second. 45 RPM is a touch over 4.7 radians per second.
--
RoRo

 

[Mark Storkamp]

In article <oo9fh3$17a$1@dont-email.me>,
Taxed and Spent <nospamplease@nonospam.com> wrote:

On 8/31/2017 9:00 AM, oldschool@tubes.com wrote:
The old 45 RPM (revolutions per minute) vinyl records were called 45's
by everyone who had them.

If we were using a metric system at that time, would they still be
called 45 rpm, or would there be some metric numbers used instead?

I was having this discussion with a few people and no one knew the
answer.....
(Personally, I think they would still be 45 rpm, but I could be wrong).


I think they would be 4.5 drpm.

The French for a time tried decimal time where there were 10 hours in a
day and 100 minutes in an hour. So in decimal minutes, or dm, it would be
64.8 rpdm or 6.48 drpdm.

 

[Trevor Wilson]

On 1/09/2017 4:59 AM, Robert Roland wrote:

On Thu, 31 Aug 2017 12:00:46 -0400, oldschool@tubes.com wrote:

If we were using a metric system at that time, would they still be
called 45 rpm, or would there be some metric numbers used instead?

The metric part of the world also measures time in oddball units.

**Huh? You mean 'seconds'? Oddball?

BTW: The "metric part of the world" is 95% of the world. A pitifully
insignificant 5% holds out against the inevitable.


I

think we are stuck with it. Switching to a new system would be
essentially insurmountable.

**RPM?

In the SI unit system, however, the unit for angular velocity is
radians per second. 45 RPM is a touch over 4.7 radians per second.

**Rotating media is so last century. The number of users is utterly
insignificant. I am, however, one of them.


--
Trevor Wilson
www.rageaudio.com.au

 

[Percival P. Cassidy]

On 08/31/2017 02:42 PM, rickman wrote:

The old 45 RPM (revolutions per minute) vinyl records were called 45's
by everyone who had them.

If we were using a metric system at that time, would they still be
called 45 rpm, or would there be some metric numbers used instead?

I was having this discussion with a few people and no one knew the
answer.....
(Personally, I think they would still be 45 rpm, but I could be wrong).


0.75 revs per second if you want to be completely non-SI about it?

https://physics.nist.gov/cuu/Units/outside.html

Depending on your usage of the info it might be 0.75*(2pi) or

4.712388980385 radians per second.

Radians/sec. was the unit I assumed it would be, but I didn't bother
with the calculation

Perce

 

[Percival P. Cassidy]

On 08/31/2017 01:55 PM, pfjw@aol.com wrote:

Revolutions per minute remain revolutions per minute in the old or new currency. Minutes and revolutions are neither metric nor SAE, nor Whitworth for that matter. all of them would count turns per time period the same.

There are also 45 rpm records of several diameters, to further confuse the issue for you.

But, each one revolves on the platter forty-five (45) turns per minute (60 seconds).

Note that in common use, RCA-base records were called 78s. Even though Edison discs were, most typically, 84s. LPs (33.3) were sometimes called "33s" but mostly LPs.

I suspect that those who were victims of your discussions were not so much uncertain of the answer as unable to formulate said answer in a way you could understand.

Many decades ago, my father bought at an auction a wind-up gramophone
with a collection of records, some of which were old Columbia 80-rpm discs.

Perce

 

[Dave Platt]

In article <f0rb02Fnk97U1@mid.individual.net>,
Percival P. Cassidy <Nobody@NotMyISP.net> wrote:

Depending on your usage of the info it might be 0.75*(2pi) or

4.712388980385 radians per second.

Radians/sec. was the unit I assumed it would be, but I didn't bother
with the calculation

I prefer furlongs per fortnight (measured at the outer edge, of
course).

Since records can vary in diameter, this would require having at least
one reliable reference standard for the industry to work from. Like
the classic metric standards for length and weight, it should be of a
stable, noncorroding metal, kept in an inert atmosphere in either
Paris or Greenwich.

Gives new meaning to the term "platinum record", doesn't it?

 

[Look165]

Go and masturbate.

oldschool@tubes.com a écrit :

The old 45 RPM (revolutions per minute) vinyl records were called 45's
by everyone who had them.

If we were using a metric system at that time, would they still be
called 45 rpm, or would there be some metric numbers used instead?

I was having this discussion with a few people and no one knew the
answer.....
(Personally, I think they would still be 45 rpm, but I could be wrong).

 

On Thursday, 31 August 2017 19:33:44 UTC+1, rickman wrote:

oldschool@tubes.com wrote on 8/31/2017 12:00 PM:
The old 45 RPM (revolutions per minute) vinyl records were called 45's
by everyone who had them.

If we were using a metric system at that time, would they still be
called 45 rpm, or would there be some metric numbers used instead?

I was having this discussion with a few people and no one knew the
answer.....
(Personally, I think they would still be 45 rpm, but I could be wrong).

0.75 rps of course! I think I would call them 3/4 rips for short.

Nearly, the second being the standard unit of time. They would be 0.75Hz.


NT

 

[rickman]

Dave Platt wrote on 8/31/2017 5:48 PM:

In article <f0rb02Fnk97U1@mid.individual.net>,
Percival P. Cassidy <Nobody@NotMyISP.net> wrote:

Depending on your usage of the info it might be 0.75*(2pi) or

4.712388980385 radians per second.

Radians/sec. was the unit I assumed it would be, but I didn't bother
with the calculation

I prefer furlongs per fortnight (measured at the outer edge, of
course).

Since records can vary in diameter, this would require having at least
one reliable reference standard for the industry to work from. Like
the classic metric standards for length and weight, it should be of a
stable, noncorroding metal, kept in an inert atmosphere in either
Paris or Greenwich.

Gives new meaning to the term "platinum record", doesn't it?

lol

--

Rick C

Viewed the eclipse at Wintercrest Farms,
on the centerline of totality since 1998