• 5v Fan on 3v line

    From Dr Stephen Strange@3:770/3 to All on Tue Aug 22 13:46:30 2023
    I have a Pi4 that came with a noisy 5v fan.

    If I connect the fan to the 3v line it spns slower and is much less noisy.

    Is this ok or will it damage the Pi

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  • From Jan Panteltje@3:770/3 to Strange on Tue Aug 22 14:16:04 2023
    On a sunny day (Tue, 22 Aug 2023 13:46:30 +0100) it happened Dr Stephen
    Strange <no.spam@me.com> wrote in <nvKcnT3WfrC7M3n5nZ2dnZfqn_WdnZ2d@brightview.co.uk>:

    I have a Pi4 that came with a noisy 5v fan.

    If I connect the fan to the 3v line it spns slower and is much less noisy.

    Is this ok or will it damage the Pi

    Not a good idea, the fan will likely overload the 3 V regulator in the Pi, also it may create noise on that 3V line
    that will affect the electronics.
    I had a noisy 5 V fan in the Pi4 4 GB, I took the fan apart, took the rotor out and greased the shaft with some vaseline.
    That was about 2 years ago.
    It has been quiet ever since, works perfectly, 24/7.

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  • From Dr Stephen Strange@3:770/3 to Jan Panteltje on Tue Aug 22 16:05:22 2023
    Jan Panteltje wrote:
    On a sunny day (Tue, 22 Aug 2023 13:46:30 +0100) it happened Dr Stephen Strange <no.spam@me.com> wrote in <nvKcnT3WfrC7M3n5nZ2dnZfqn_WdnZ2d@brightview.co.uk>:

    I have a Pi4 that came with a noisy 5v fan.

    If I connect the fan to the 3v line it spns slower and is much less noisy. >>
    Is this ok or will it damage the Pi

    Not a good idea, the fan will likely overload the 3 V regulator in the Pi, also it may create noise on that 3V line
    that will affect the electronics.
    I had a noisy 5 V fan in the Pi4 4 GB, I took the fan apart, took the rotor out and greased the shaft with some vaseline.
    That was about 2 years ago.
    It has been quiet ever since, works perfectly, 24/7.


    Ok - thanks

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  • From Dan Clough@1:135/115 to Jan Panteltje on Tue Aug 22 11:19:00 2023
    Jan Panteltje wrote to Strange <=-

    I have a Pi4 that came with a noisy 5v fan.

    If I connect the fan to the 3v line it spns slower and is much less noisy.

    Is this ok or will it damage the Pi

    Not a good idea, the fan will likely overload the 3 V regulator
    in the Pi, also it may create noise on that 3V line that will
    affect the electronics. I had a noisy 5 V fan in the Pi4 4 GB, I
    took the fan apart, took the rotor out and greased the shaft with
    some vaseline. That was about 2 years ago.
    It has been quiet ever since, works perfectly, 24/7.

    Hogwash. I've got a Pi4 that I've been running the fan on the 3v pin
    for at least 2 years, 24/7, and it's perfectly fine.



    ... Anything is possible if you don't know what you're talking about
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    --- SBBSecho 3.20-Linux
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  • From Brian Gregory@3:770/3 to Dr Stephen Strange on Tue Aug 22 17:47:36 2023
    On 22/08/2023 16:05, Dr Stephen Strange wrote:
    Jan Panteltje wrote:
    On a sunny day (Tue, 22 Aug 2023 13:46:30 +0100) it happened Dr Stephen
    Strange <no.spam@me.com> wrote in
    <nvKcnT3WfrC7M3n5nZ2dnZfqn_WdnZ2d@brightview.co.uk>:

    I have a Pi4 that came with a noisy 5v fan.

    If I connect the fan to the 3v line it spns slower and is much less
    noisy.

    Is this ok or will it damage the Pi

    Not a good idea, the fan will likely overload the 3 V regulator in the
    Pi, also it may create noise on that 3V line
    that will affect the electronics.
    I had a noisy 5 V fan in the Pi4 4 GB, I took the fan apart, took the
    rotor out and greased the shaft with some vaseline.
    That was about 2 years ago.
    It has been quiet ever since, works perfectly, 24/7.


    Ok - thanks


    You can just use a series resistor to slow the fan while still powering
    it from 5V. Exp0eriment with the value of resistor until you get the
    right speed.

    --
    Brian Gregory (in England).

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  • From druck@3:770/3 to Jan Panteltje on Tue Aug 22 21:32:36 2023
    On 22/08/2023 15:16, Jan Panteltje wrote:
    On a sunny day (Tue, 22 Aug 2023 13:46:30 +0100) it happened Dr Stephen Strange <no.spam@me.com> wrote in <nvKcnT3WfrC7M3n5nZ2dnZfqn_WdnZ2d@brightview.co.uk>:

    I have a Pi4 that came with a noisy 5v fan.

    If I connect the fan to the 3v line it spns slower and is much less noisy. >>
    Is this ok or will it damage the Pi

    Not a good idea, the fan will likely overload the 3 V regulator in the Pi, also it may create noise on that 3V line
    that will affect the electronics.
    I had a noisy 5 V fan in the Pi4 4 GB, I took the fan apart, took the rotor out and greased the

    Doesn't seem to be an issue, I've been running dozens of 3B's, 3B+'s and
    4B's with fans on 3.3V since they came out, and I've never had a failure.

    I've not used fans on the original B, 2B's Zero's or Zero 2's. The only
    Pi's I've had fail have been a Zero and a 4B which had a passive
    heatsinks and probably ran too hot for too long, so 3.3V fans can't be implicated in either of those, and could have even saved them.

    ---druck

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  • From Computer Nerd Kev@3:770/3 to Brian Gregory on Wed Aug 23 08:47:08 2023
    Brian Gregory <void-invalid-dead-dontuse@email.invalid> wrote:

    You can just use a series resistor to slow the fan while still powering
    it from 5V. Exp0eriment with the value of resistor until you get the
    right speed.

    That's a much better option than stressing the voltage regulator on
    the Pi. A 2V zener diode could also be used in series to avoid
    needing to experiment with the resistor value if 3v is considered
    roughly optimal. Or 2-3 normal silicon diodes in series.

    --
    __ __
    #_ < |\| |< _#

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  • From The Natural Philosopher@3:770/3 to Dan Clough on Wed Aug 23 08:01:34 2023
    On 21/08/2023 23:19, Dan Clough wrote:
    Jan Panteltje wrote to Strange <=-

    >I have a Pi4 that came with a noisy 5v fan.
    >
    >If I connect the fan to the 3v line it spns slower and is much less noisy.
    >
    >Is this ok or will it damage the Pi

    JP> Not a good idea, the fan will likely overload the 3 V regulator
    JP> in the Pi, also it may create noise on that 3V line that will
    JP> affect the electronics. I had a noisy 5 V fan in the Pi4 4 GB, I
    JP> took the fan apart, took the rotor out and greased the shaft with
    JP> some vaseline. That was about 2 years ago.
    JP> It has been quiet ever since, works perfectly, 24/7.

    Hogwash. I've got a Pi4 that I've been running the fan on the 3v pin
    for at least 2 years, 24/7, and it's perfectly fine.



    ... Anything is possible if you don't know what you're talking about
    === MultiMail/Linux v0.52

    Indeed. without knowing more about what it draws, 'is likely' is just
    pissing in the wind.

    --
    WOKE is an acronym... Without Originality, Knowledge or Education.

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  • From The Natural Philosopher@3:770/3 to Jan Panteltje on Wed Aug 23 08:00:20 2023
    On 22/08/2023 15:16, Jan Panteltje wrote:
    On a sunny day (Tue, 22 Aug 2023 13:46:30 +0100) it happened Dr Stephen Strange <no.spam@me.com> wrote in <nvKcnT3WfrC7M3n5nZ2dnZfqn_WdnZ2d@brightview.co.uk>:

    I have a Pi4 that came with a noisy 5v fan.

    If I connect the fan to the 3v line it spns slower and is much less noisy. >>
    Is this ok or will it damage the Pi

    Not a good idea, the fan will likely overload the 3 V regulator in the Pi, also it may create noise on that 3V line
    that will affect the electronics.
    I had a noisy 5 V fan in the Pi4 4 GB, I took the fan apart, took the rotor out and greased the shaft with some vaseline.
    That was about 2 years ago.
    It has been quiet ever since, works perfectly, 24/7.

    you shouldn't use grease on small electric motors. Light sewing machine
    oil is best.
    --
    “The urge to save humanity is almost always only a false face for the
    urge to rule it.”
    – H. L. Mencken

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  • From Jan Panteltje@3:770/3 to Philosopher on Wed Aug 23 08:38:30 2023
    On a sunny day (Wed, 23 Aug 2023 08:00:21 +0100) it happened The Natural Philosopher <tnp@invalid.invalid> wrote in <uc4aq5$2qn7d$4@dont-email.me>:

    On 22/08/2023 15:16, Jan Panteltje wrote:
    On a sunny day (Tue, 22 Aug 2023 13:46:30 +0100) it happened Dr Stephen
    Strange <no.spam@me.com> wrote in
    <nvKcnT3WfrC7M3n5nZ2dnZfqn_WdnZ2d@brightview.co.uk>:

    I have a Pi4 that came with a noisy 5v fan.

    If I connect the fan to the 3v line it spns slower and is much less noisy. >>>
    Is this ok or will it damage the Pi

    Not a good idea, the fan will likely overload the 3 V regulator in the Pi, also it may create noise on that 3V line
    that will affect the electronics.
    I had a noisy 5 V fan in the Pi4 4 GB, I took the fan apart, took the rotor out and greased the shaft with some vaseline.
    That was about 2 years ago.
    It has been quiet ever since, works perfectly, 24/7.

    you shouldn't use grease on small electric motors.

    Well the fact that it works for years 24/7 with vaseline proves you wrong.
    And if you want to screw up your 3V regulator best of luck with it, wtf do I care.

    There are also people who climb mount Everest and make it
    But then again..
    LOL
    not me !!
    Maybe this newsgroup is not worth reading mostly your boring quotes...

    Go to hell and take your Usenet group with you.
    Unsubscribing

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  • From mm0fmf@3:770/3 to Jan Panteltje on Wed Aug 23 11:55:10 2023
    On 23/08/2023 09:38, Jan Panteltje wrote:

    [much snipping]

    Unsubscribing

    Result!

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  • From Charlie Gibbs@3:770/3 to The Natural Philosopher on Wed Aug 23 16:46:36 2023
    On 2023-08-23, The Natural Philosopher <tnp@invalid.invalid> wrote:

    On 22/08/2023 15:16, Jan Panteltje wrote:

    I had a noisy 5 V fan in the Pi4 4 GB, I took the fan apart,
    took the rotor out and greased the shaft with some vaseline.
    That was about 2 years ago.
    It has been quiet ever since, works perfectly, 24/7.

    you shouldn't use grease on small electric motors.
    Light sewing machine oil is best.

    Yup. I've revived a lot of fans with a few drops of 3-in-1 oil.

    --
    /~\ Charlie Gibbs | You can't save the earth
    \ / <cgibbs@kltpzyxm.invalid> | unless you're willing to
    X I'm really at ac.dekanfrus | make other people sacrifice.
    / \ if you read it the right way. | -- Dogbert the green consultant

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  • From David Higton@3:770/3 to Computer Nerd Kev on Wed Aug 23 17:33:30 2023
    In message <64e53aed@news.ausics.net>
    not@telling.you.invalid (Computer Nerd Kev) wrote:

    Brian Gregory <void-invalid-dead-dontuse@email.invalid> wrote:

    You can just use a series resistor to slow the fan while still powering
    it from 5V. Exp0eriment with the value of resistor until you get the
    right speed.

    That's a much better option than stressing the voltage regulator on the Pi.
    A 2V zener diode could also be used in series to avoid needing to
    experiment with the resistor value if 3v is considered roughly optimal. Or 2-3 normal silicon diodes in series.

    I too would recommend any of those solutions.

    Running a fan from the 3.3V line might work, and clearly it does for
    some people's cases; but it isn't possible to generalise from one or
    two cases. The 3.3V line may or may not have adequate spare capacity
    for a particular fan.

    David

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  • From Grant Weasner@1:229/317 to Dr Stephen Strange on Wed Aug 23 13:50:16 2023
    Dr Stephen Strange wrote to All <=-

    I have a Pi4 that came with a noisy 5v fan.

    If I connect the fan to the 3v line it spns slower and is much less noisy.

    Is this ok or will it damage the Pi

    It will be fine. I use 3v on my fan, and its way better. The fan will last longer as well.

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  • From Grant Weasner@1:229/317 to The Natural Philosopher on Thu Aug 24 01:02:58 2023
    The Natural Philosopher wrote to Jan Panteltje <=-

    On 22/08/2023 15:16, Jan Panteltje wrote:
    On a sunny day (Tue, 22 Aug 2023 13:46:30 +0100) it happened Dr Stephen Strange <no.spam@me.com> wrote in <nvKcnT3WfrC7M3n5nZ2dnZfqn_WdnZ2d@brightview.co.uk>:

    I have a Pi4 that came with a noisy 5v fan.

    If I connect the fan to the 3v line it spns slower and is much less noisy.

    Is this ok or will it damage the Pi

    Not a good idea, the fan will likely overload the 3 V regulator in the Pi,
    also it may create noise on that 3V line
    that will affect the electronics.
    I had a noisy 5 V fan in the Pi4 4 GB, I took the fan apart, took the rotor
    out and greased the shaft with some vaseline.
    That was about 2 years ago.
    It has been quiet ever since, works perfectly, 24/7.

    you shouldn't use grease on small electric motors. Light sewing machine oil is best.

    Its an easy fix if you've done it before. Almost all fans today electric that resemble computer type fan:
    on the flat side of fan, there is a sticker.
    Gently pull it off.
    Under the sticker is shaft for the rotor.
    Drop that tiny amount of oil in there (3 and 1) works pretty good, but use what you have.
    Put the sticker back on.
    Test fan. The noise should be better.


    NOTE: I use 3v pin and ground for my fan on all pies since they came out, and since 2013 my raspi comps are still working fine. I do this because I don't want to fix the fan as soon. Cooling with 3v works great.

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  • From Grant Weasner@1:229/317 to Charlie Gibbs on Thu Aug 24 01:02:58 2023
    Charlie Gibbs wrote to The Natural Philosopher <=-

    On 2023-08-23, The Natural Philosopher <tnp@invalid.invalid> wrote:

    On 22/08/2023 15:16, Jan Panteltje wrote:

    I had a noisy 5 V fan in the Pi4 4 GB, I took the fan apart,
    took the rotor out and greased the shaft with some vaseline.
    That was about 2 years ago.
    It has been quiet ever since, works perfectly, 24/7.

    you shouldn't use grease on small electric motors.
    Light sewing machine oil is best.

    Yup. I've revived a lot of fans with a few drops of 3-in-1 oil.

    Yeah don't use grease ... grease was just a poor word choice, 3-in-1 oil is what I used, but not always easy to get, depending where you live.

    --
    /~\ Charlie Gibbs | You can't save the earth
    \ / <cgibbs@kltpzyxm.invalid> | unless you're willing to
    X I'm really at ac.dekanfrus | make other people sacrifice.
    / \ if you read it the right way. | -- Dogbert the green
    consultant

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  • From The Natural Philosopher@3:770/3 to Grant Weasner on Thu Aug 24 08:28:02 2023
    On 23/08/2023 13:02, Grant Weasner wrote:
    The Natural Philosopher wrote to Jan Panteltje <=-

    TNP> On 22/08/2023 15:16, Jan Panteltje wrote:
    > On a sunny day (Tue, 22 Aug 2023 13:46:30 +0100) it happened Dr Stephen
    > Strange <no.spam@me.com> wrote in
    > <nvKcnT3WfrC7M3n5nZ2dnZfqn_WdnZ2d@brightview.co.uk>:
    >
    >> I have a Pi4 that came with a noisy 5v fan.
    >>
    >> If I connect the fan to the 3v line it spns slower and is much less noisy.
    >>
    >> Is this ok or will it damage the Pi
    >
    > Not a good idea, the fan will likely overload the 3 V regulator in the Pi,
    TNP> also it may create noise on that 3V line
    > that will affect the electronics.
    > I had a noisy 5 V fan in the Pi4 4 GB, I took the fan apart, took the rotor
    TNP> out and greased the shaft with some vaseline.
    > That was about 2 years ago.
    > It has been quiet ever since, works perfectly, 24/7.
    >
    TNP> you shouldn't use grease on small electric motors. Light sewing machine
    TNP> oil is best.

    Its an easy fix if you've done it before. Almost all fans today electric that resemble computer type fan:
    on the flat side of fan, there is a sticker.
    Gently pull it off.
    Under the sticker is shaft for the rotor.
    Drop that tiny amount of oil in there (3 and 1) works pretty good, but use what
    you have.
    Put the sticker back on.
    Test fan. The noise should be better.

    Yes. Cheap fans will use bronze bearings, and these will absorb light
    oil. They seize up from the oil drying out. A good soaking in a light
    oil will sort them out. Grease will work, but it will dry out fast than oil. Better classes of fan would use sealed ball bearings, which you cant oil anyway.


    NOTE: I use 3v pin and ground for my fan on all pies since they came out, and since 2013 my raspi comps are still working fine. I do this because I don't want to fix the fan as soon. Cooling with 3v works great.

    My time on high powered electronics staring at the cooling curves of fan
    blown heatsinks shows that a huge draught is not required. Convection is
    a very slow air movement. As soon as *any* wind is persent, the heatloss improves massively. It is less a case of 'forced cooling' than 'removing
    the hot air just above the surface'.



    --
    Future generations will wonder in bemused amazement that the early
    twenty-first century’s developed world went into hysterical panic over a globally average temperature increase of a few tenths of a degree, and,
    on the basis of gross exaggerations of highly uncertain computer
    projections combined into implausible chains of inference, proceeded to contemplate a rollback of the industrial age.

    Richard Lindzen

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  • From The Natural Philosopher@3:770/3 to Grant Weasner on Thu Aug 24 08:33:04 2023
    On 23/08/2023 13:02, Grant Weasner wrote:
    Charlie Gibbs wrote to The Natural Philosopher <=-

    CG> On 2023-08-23, The Natural Philosopher <tnp@invalid.invalid> wrote:

    > On 22/08/2023 15:16, Jan Panteltje wrote:
    >
    >> I had a noisy 5 V fan in the Pi4 4 GB, I took the fan apart,
    >> took the rotor out and greased the shaft with some vaseline.
    >> That was about 2 years ago.
    >> It has been quiet ever since, works perfectly, 24/7.
    >
    > you shouldn't use grease on small electric motors.
    > Light sewing machine oil is best.

    CG> Yup. I've revived a lot of fans with a few drops of 3-in-1 oil.

    Yeah don't use grease ... grease was just a poor word choice, 3-in-1 oil is what I used, but not always easy to get, depending where you live.


    '3 in 1' is one brand, 'sewing machine oil' is another good term to
    search for. or 'light machine oil'. That last got me the most results on Amazon.

    The sort of stuff model train people use.

    --
    The higher up the mountainside
    The greener grows the grass.
    The higher up the monkey climbs
    The more he shows his arse.

    Traditional

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  • From Brian Gregory@3:770/3 to The Natural Philosopher on Thu Aug 24 23:25:34 2023
    On 24/08/2023 08:33, The Natural Philosopher wrote:
    On 23/08/2023 13:02, Grant Weasner wrote:
    Yeah don't use grease ... grease was just a poor word choice, 3-in-1
    oil is
    what I used, but not always easy to get, depending where you live.


    '3 in 1' is one brand, 'sewing machine oil' is another good term to
    search for. or 'light machine oil'. That last got me the most results on Amazon.

    The sort of stuff model train people use.


    3 in 1 oil is rather brown so when it eventually dries out what's left
    will be quite thick and sticky like tar. A light pale coloured sewing
    machine oil would be my choice.

    --
    Brian Gregory (in England).

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  • From Grant Weasner@1:229/317 to The Natural Philosopher on Fri Aug 25 03:02:58 2023
    The Natural Philosopher wrote to bbsing <=-

    On 23/08/2023 13:02, Grant Weasner wrote:
    Charlie Gibbs wrote to The Natural Philosopher <=-

    CG> On 2023-08-23, The Natural Philosopher <tnp@invalid.invalid> wrote:

    > On 22/08/2023 15:16, Jan Panteltje wrote:
    >
    >> I had a noisy 5 V fan in the Pi4 4 GB, I took the fan apart,
    >> took the rotor out and greased the shaft with some vaseline.
    >> That was about 2 years ago.
    >> It has been quiet ever since, works perfectly, 24/7.
    >
    > you shouldn't use grease on small electric motors.
    > Light sewing machine oil is best.

    CG> Yup. I've revived a lot of fans with a few drops of 3-in-1 oil.

    Yeah don't use grease ... grease was just a poor word choice, 3-in-1 oil is what I used, but not always easy to get, depending where you live.


    '3 in 1' is one brand, 'sewing machine oil' is another good term to search for. or 'light machine oil'. That last got me the most results
    on Amazon.

    The sort of stuff model train people use.

    I didn't know '3 in 1' was a brand. So next time I need something good, I'll know how to better search for it online.

    Thanks The Natural Philosopher


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  • From The Natural Philosopher@3:770/3 to Brian Gregory on Fri Aug 25 08:13:24 2023
    On 24/08/2023 23:25, Brian Gregory wrote:
    On 24/08/2023 08:33, The Natural Philosopher wrote:
    On 23/08/2023 13:02, Grant Weasner wrote:
    Yeah don't use grease ... grease was just a poor word choice, 3-in-1
    oil is
    what I used, but not always easy to get, depending where you live.


    '3 in 1' is one brand, 'sewing machine oil' is another good term to
    search for. or 'light machine oil'. That last got me the most results
    on Amazon.

    The sort of stuff model train people use.


    3 in 1 oil is rather brown so when it eventually dries out what's left
    will be quite thick and sticky like tar. A light pale coloured sewing
    machine oil would be my choice.

    All oils that are blends of various fractions of oils will thicken as
    they dry out.
    Top quality oil is a blend of far fewer....and yes, Id go for sewing
    machine oil



    --
    I would rather have questions that cannot be answered...
    ...than to have answers that cannot be questioned

    Richard Feynman

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  • From The Natural Philosopher@3:770/3 to Grant Weasner on Fri Aug 25 08:48:52 2023
    On 24/08/2023 15:02, Grant Weasner wrote:
    The Natural Philosopher wrote to bbsing <=-

    TNP> On 23/08/2023 13:02, Grant Weasner wrote:
    > -=> Charlie Gibbs wrote to The Natural Philosopher <=-
    >
    > CG> On 2023-08-23, The Natural Philosopher <tnp@invalid.invalid> wrote:
    >
    > > On 22/08/2023 15:16, Jan Panteltje wrote:
    > >
    > >> I had a noisy 5 V fan in the Pi4 4 GB, I took the fan apart,
    > >> took the rotor out and greased the shaft with some vaseline.
    > >> That was about 2 years ago.
    > >> It has been quiet ever since, works perfectly, 24/7.
    > >
    > > you shouldn't use grease on small electric motors.
    > > Light sewing machine oil is best.
    >
    > CG> Yup. I've revived a lot of fans with a few drops of 3-in-1 oil.
    >
    > Yeah don't use grease ... grease was just a poor word choice, 3-in-1 oil is
    > what I used, but not always easy to get, depending where you live.
    >
    >
    TNP> '3 in 1' is one brand, 'sewing machine oil' is another good term to
    TNP> search for. or 'light machine oil'. That last got me the most results
    TNP> on Amazon.

    TNP> The sort of stuff model train people use.

    I didn't know '3 in 1' was a brand. So next time I need something good, I'll know how to better search for it online.

    Thanks The Natural Philosopher

    I have 3 in one in my model cupboard. Its OK for quite big motors, but
    from memory sewing machine oil is better for smaller stuff.

    I think the model train and slot car racing people use something lighter
    than 3 in 1

    As do clock and watch repair people.

    It seems that 5V fans are typically 300mA or less.

    On 3v Id expect them to be around 150mA. That is not a huge amount to
    load a 3V supply with.

    They are also incredibly cheap - $4 or less. Oil to fix a flagging bad
    one is probably more expensive




    ___ MultiMail/Linux v0.49


    --
    “it should be clear by now to everyone that activist environmentalism
    (or environmental activism) is becoming a general ideology about humans,
    about their freedom, about the relationship between the individual and
    the state, and about the manipulation of people under the guise of a
    'noble' idea. It is not an honest pursuit of 'sustainable development,'
    a matter of elementary environmental protection, or a search for
    rational mechanisms designed to achieve a healthy environment. Yet
    things do occur that make you shake your head and remind yourself that
    you live neither in Joseph Stalin’s Communist era, nor in the Orwellian utopia of 1984.”

    Vaclav Klaus

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  • From Ahem A Rivet's Shot@3:770/3 to The Natural Philosopher on Fri Aug 25 16:28:22 2023
    On Fri, 25 Aug 2023 08:48:53 +0100
    The Natural Philosopher <tnp@invalid.invalid> wrote:

    As do clock and watch repair people.

    They generally use a really nice synthetic oil that's certain not
    to damage brass.

    --
    Steve O'Hara-Smith
    Odds and Ends at http://www.sohara.org/
    Host: Beautiful Theory meet Inconvenient Fact
    Obit: Beautiful Theory died today of factual inconsistency

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  • From Jim H@3:770/3 to dave@davehigton.me.uk on Fri Aug 25 17:54:12 2023
    On Wed, 23 Aug 2023 17:33:31 +0100, in
    <e40f86d85a.DaveMeUK@BeagleBoard-xM>, David Higton
    <dave@davehigton.me.uk> wrote:

    In message <64e53aed@news.ausics.net>
    not@telling.you.invalid (Computer Nerd Kev) wrote:

    Brian Gregory <void-invalid-dead-dontuse@email.invalid> wrote:

    You can just use a series resistor to slow the fan while still powering
    it from 5V. Exp0eriment with the value of resistor until you get the
    right speed.

    That's a much better option than stressing the voltage regulator on the Pi. >> A 2V zener diode could also be used in series to avoid needing to
    experiment with the resistor value if 3v is considered roughly optimal. Or >> 2-3 normal silicon diodes in series.

    I too would recommend any of those solutions.

    Running a fan from the 3.3V line might work, and clearly it does for
    some people's cases; but it isn't possible to generalise from one or
    two cases. The 3.3V line may or may not have adequate spare capacity
    for a particular fan.


    I imagine a fan works fine off the 3.3v line if the only things
    drawing power are the Pi and a fan, but for those who also have one or
    more hats I wouldn't dream of powering a fan off the 3.3v line. It's
    too easy to add a resistor or diodes, as mentioned above, and power
    from the 5v supply.

    Sewing machine oil can be either natural, synthetic or petrochemical.
    I'd use synthetic (silicone), but not the other two, esp not natural.
    Natural oil ages, oxidizes and evaporates over time. Good luck if the
    can the oil comes in specifies what's what.

    I'd also use a fan with ball bearings, not sleeve bearings.
    --
    Jim H

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  • From Andrew Smallshaw@3:770/3 to The Natural Philosopher on Fri Aug 25 20:27:16 2023
    On 2023-08-25, The Natural Philosopher <tnp@invalid.invalid> wrote:

    It seems that 5V fans are typically 300mA or less.

    On 3v Id expect them to be around 150mA. That is not a huge amount to
    load a 3V supply with.

    I've only actually taken measurements a couple of times previously
    but in my experience BLDC fans work to a first approximation as a
    constant current sink. E.g. if a fan draws 200mA at 12V it'll draw
    near as dammit 200mA on 5, 6, or 7V.

    They are also incredibly cheap - $4 or less. Oil to fix a flagging bad
    one is probably more expensive

    Careful though, those cheap fans may work out very expensive
    especially when the hassle as well as expense of premature further
    replacement is factored in. It generally pays to get something
    mid-market (or nearer the premium end of the computer market) with
    a longer expected service life otherwise you are just replacing
    junk with junk.

    On the other hand, you'd probably find it difficult to justify true
    premium replacements - e.g. you could easily multiply that budget
    by ten for certain Papst ranges. Great fans sure, but several tens
    of dollars each probably isn't a justifed investment.

    --
    Andrew Smallshaw
    andrews@sdf.org

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  • From Robert Riches@3:770/3 to Grant Weasner on Sat Aug 26 02:30:34 2023
    On 2023-08-24, Grant Weasner <nospam.Grant.Weasner@f317.n229.z1.fidonet.org> wrote:
    The Natural Philosopher wrote to bbsing <=-

    On 23/08/2023 13:02, Grant Weasner wrote:
    Charlie Gibbs wrote to The Natural Philosopher <=-

    CG> On 2023-08-23, The Natural Philosopher <tnp@invalid.invalid> wrote:

    > On 22/08/2023 15:16, Jan Panteltje wrote:
    >
    >> I had a noisy 5 V fan in the Pi4 4 GB, I took the fan apart,
    >> took the rotor out and greased the shaft with some vaseline.
    >> That was about 2 years ago.
    >> It has been quiet ever since, works perfectly, 24/7.
    >
    > you shouldn't use grease on small electric motors.
    > Light sewing machine oil is best.

    CG> Yup. I've revived a lot of fans with a few drops of 3-in-1 oil.

    Yeah don't use grease ... grease was just a poor word choice, 3-in-1 oil is what I used, but not always easy to get, depending where you live.


    '3 in 1' is one brand, 'sewing machine oil' is another good term to search for. or 'light machine oil'. That last got me the most results on Amazon.

    The sort of stuff model train people use.

    I didn't know '3 in 1' was a brand. So next time I need something good, I'll know how to better search for it online.

    Thanks The Natural Philosopher


    ___ MultiMail/Linux v0.49

    https://duckduckgo.com/?q=3-in-1+oil&hps=1&start=1&ia=web

    It has been a brand in the US for at least 55-60 years. I have a
    metal can of it in my box of misc. hobby chemicals (glues, oils,
    etc.) that I think my father had when I was in grade school. The
    paint is all worn out, but the oil seems to have maintained at
    least a decent character.

    HTH

    --
    Robert Riches
    spamtrap42@jacob21819.net
    (Yes, that is one of my email addresses.)

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  • From Ahem A Rivet's Shot@3:770/3 to Robert Riches on Sat Aug 26 07:49:34 2023
    On 26 Aug 2023 02:30:35 GMT
    Robert Riches <spamtrap42@jacob21819.net> wrote:

    3-in-1

    It has been a brand in the US for at least 55-60 years.

    Also in the UK.

    --
    Steve O'Hara-Smith
    Odds and Ends at http://www.sohara.org/
    Host: Beautiful Theory meet Inconvenient Fact
    Obit: Beautiful Theory died today of factual inconsistency

    --- SoupGate-Win32 v1.05
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  • From The Natural Philosopher@3:770/3 to Ahem A Rivet's Shot on Sat Aug 26 10:11:42 2023
    On 26/08/2023 07:49, Ahem A Rivet's Shot wrote:
    On 26 Aug 2023 02:30:35 GMT
    Robert Riches <spamtrap42@jacob21819.net> wrote:

    3-in-1

    It has been a brand in the US for at least 55-60 years.

    Also in the UK.

    "3-in-One Oil is a general-purpose lubricating oil sold for household
    and do-it-yourself use. It was originally formulated in 1894 for use on bicycles, and remains a popular lubricant for their chains. Its name,
    given by inventor George W. Cole of New Jersey in 1894, reflects the
    product's triple ability to "clean, lubricate and protect".

    The product changed ownership many times throughout the 20th century and
    was bought by its current owners, the WD-40 Company, in 1995."

    --
    “Some people like to travel by train because it combines the slowness of
    a car with the cramped public exposure of 
an airplane.”

    Dennis Miller

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  • From Ahem A Rivet's Shot@3:770/3 to The Natural Philosopher on Sat Aug 26 10:44:44 2023
    On Sat, 26 Aug 2023 10:11:43 +0100
    The Natural Philosopher <tnp@invalid.invalid> wrote:

    It was originally formulated in 1894 for use on
    bicycles, and remains a popular lubricant for their chains.

    That's what I used it for mainly - it kept my bikes running smoothly for a couple of decades.

    --
    Steve O'Hara-Smith
    Odds and Ends at http://www.sohara.org/
    Host: Beautiful Theory meet Inconvenient Fact
    Obit: Beautiful Theory died today of factual inconsistency

    --- SoupGate-Win32 v1.05
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