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What actually makes that "chattering" sound that old tape systems make?
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On Fri, 19 Dec 2008 09:26:25 +0000, Invisible <voi### [at] dev null> wrote:
>What actually makes that "chattering" sound that old tape systems make?
Are you talking about magnetic tape or paper tape?
--
Regards
Stephen
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Stephen wrote:
> On Fri, 19 Dec 2008 09:26:25 +0000, Invisible <voi### [at] devnull> wrote:
>
>> What actually makes that "chattering" sound that old tape systems make?
>
> Are you talking about magnetic tape or paper tape?
HAHAHAHA!
Good god man, magnetic! I've never *seen* paper tape, except in a museum...
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On Fri, 19 Dec 2008 09:56:05 +0000, Invisible <voi### [at] devnull> wrote:
>Stephen wrote:
>> On Fri, 19 Dec 2008 09:26:25 +0000, Invisible <voi### [at] devnull> wrote:
>>
>>> What actually makes that "chattering" sound that old tape systems make?
>>
>> Are you talking about magnetic tape or paper tape?
>
>HAHAHAHA!
>
>Good god man, magnetic! I've never *seen* paper tape, except in a museum...
Just asking! You have a wide range of interests.
The chattering is probably the tensioning system and the tape drive starting and
stopping as the data is read.
--
Regards
Stephen
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> What actually makes that "chattering" sound that old tape systems make?
Lots of complex mechanical parts in a tape playback system (clutches,
pulleys, idler gears, speed controllers, brakes etc) , the main "problem" is
that you need to control the speed of the tape during playback and recording
to a very accurate value. You also need to drive the two spools
appropiately to avoid the tape getting all bunched up or snapping. You need
to do this correctly for vastly different radii of tape on each spool (so
you can't just drive the spools at a fixed or calculated rate), plus during
fast forward and reverse.
I imagine the noise you are referring to could be anything within the whole
drive system within the tape player.
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>>> Are you talking about magnetic tape or paper tape?
>> HAHAHAHA!
>>
>> Good god man, magnetic! I've never *seen* paper tape, except in a museum...
>
> Just asking! You have a wide range of interests.
You're definitely showing your age. ;-) Paper tapes? Good Lord...
> The chattering is probably the tensioning system and the tape drive starting and
> stopping as the data is read.
Right. And it's so loud because the tape itself makes a good speaker cone?
(FWIW, the old tape system was pretty silent. This new one is quite noisey.)
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scott wrote:
>> What actually makes that "chattering" sound that old tape systems make?
>
> Lots of complex mechanical parts in a tape playback system (clutches,
> pulleys, idler gears, speed controllers, brakes etc) , the main
> "problem" is that you need to control the speed of the tape during
> playback and recording to a very accurate value. You also need to drive
> the two spools appropiately to avoid the tape getting all bunched up or
> snapping. You need to do this correctly for vastly different radii of
> tape on each spool (so you can't just drive the spools at a fixed or
> calculated rate), plus during fast forward and reverse.
>
> I imagine the noise you are referring to could be anything within the
> whole drive system within the tape player.
Our old DDS tape system was pretty quiet. Almost inaudible over the roar
of the air conditioning system and the cooling fans and harddrives of 5
servers.
The LTO1 tape robot we got after that was quite quiet. Reading from tape
was silent. Moving the caracel was audible; you could hear the cars go
round inside.
Our new LTO3 tape robot is... very loud. The robot itself makes all
mannar of grating and grinding noises as it works. (I checked the manual
several times to see if there's any restraining bolts you're supposed to
remove after transit or anything, but no...)
The tape *drive* itself is comparatively quiet. But when it first loads
the tape, and occasionally thereafter, it makes a "chattering" noise
which sounds *exactly* like the 1960s reel-to-reel tape streamers you
see in old movies.
I'm just wondering exactly what part of it makes the noise. It seems
logical that it would be some part of the tape drive system; I guess a
loop of taught tape makes a good sound board...
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On Fri, 19 Dec 2008 10:37:26 +0000, Invisible <voi### [at] devnull> wrote:
>>>> Are you talking about magnetic tape or paper tape?
>>> HAHAHAHA!
>>>
>>> Good god man, magnetic! I've never *seen* paper tape, except in a museum...
>>
>> Just asking! You have a wide range of interests.
>
>You're definitely showing your age. ;-) Paper tapes? Good Lord...
>
And card readers ;)
>> The chattering is probably the tensioning system and the tape drive starting and
>> stopping as the data is read.
>
>Right. And it's so loud because the tape itself makes a good speaker cone?
>
>(FWIW, the old tape system was pretty silent. This new one is quite noisey.)
That does not sound good. I'd check with the supplier.
--
Regards
Stephen
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On Fri, 19 Dec 2008 10:41:31 +0000, Invisible <voi### [at] devnull> wrote:
>
>I'm just wondering exactly what part of it makes the noise. It seems
>logical that it would be some part of the tape drive system; I guess a
>loop of taught tape makes a good sound board...
Use a small screwdriver as a stethoscope. Press the handle against the cartilage
in front of auditory canal, closing the ear and place the blade against the tape
drive at various places to see if you can identify where the noise is coming
from.
--
Regards
Stephen
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Stephen wrote:
> Use a small screwdriver as a stethoscope. Press the handle against the cartilage
> in front of auditory canal, closing the ear and place the blade against the tape
> drive at various places to see if you can identify where the noise is coming
> from.
*Clearly* you've done this a great many times before. ;-)
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