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From: Phil Allison on 14 Mar 2010 04:06

"pawihte"
> Phil Allison wrote:
>> "pawihte"
>>>
>>> What common substance would be acceptable as a lubricant for consumer
>>> grade volume control pots?
>>
>> ** Pots do not need lubricating.
>>
>> How about you post a question properly for once ?
>>
>> What is the actual problem with the pots ??
>
> This is not about a problem with a particular pot. Many inexpensive carbon
> pots develop intermittent contacts and scratchy sounds in audio. This
> happens both with pots fitted in a product by a manufacturer and with pots
> bought from a shop. Some become defective within a couple of months of
> regular use, especially in a dusty environment and/or if they have dc
> current passing through them. Replacing them with better quality pots is
> not always an option. Flushing with a solvent usually makes them OK again
> for a while, but this also takes out the lubricant and makes the track
> wear out more quickly.


** Totally mangled nonsense - the track of a carbon ( or other) pot has no
lubricant applied during manufacture.

Any lubricant that resided on the track would prevent operation - cos
lubricants are insulators.

Rapidly evaporating solvents are rarely any use for fixing noisy pots while
slow evaporating ones that leave a thin oil residue are very good at the
job.

Also, rotary pots do not get " dust " inside them.

What actually causes all the trouble is a when a mix of fine carbon
particles from the track and grease from the shaft bearing accumulate on the
fingers of the two wipers and render them partially non conducting. Also,
the metal to metal wiper contacts suffer from surface contamination by the
moisture and sulphides in the air - a thin oily film helps prevent any
recurrence of this. The oil must be thin that rotating the pot displaces
all of it from the contact areas.

A mix of oil and petroleum solvent has a very low surface tension so easily
travels by capillary action to cover all the insides of a pot.

There is a very famous product that fits the bill exactly ...... W
something ......

One uses only a small amount ( a few drops) and then rotates the pot many
times to help it do the trick - repeating the process only if necessary.
If the pot is still noisy - replacement is the only option.

BTW

Some 100mm fader pots I looked at a week back did not respond to the above
treatment - when opened up I found the finger contacts on the slider were
worn completely away !!!



..... Phil



From: pawihte on 14 Mar 2010 05:19
Phil Allison wrote:
> "pawihte"
>> Phil Allison wrote:
>>> "pawihte"
>>>>
>>>> What common substance would be acceptable as a lubricant for
>>>> consumer grade volume control pots?
>>>
>>> ** Pots do not need lubricating.
>>>
>>> How about you post a question properly for once ?
>>>
>>> What is the actual problem with the pots ??
>>
>> This is not about a problem with a particular pot. Many
>> inexpensive
>> carbon pots develop intermittent contacts and scratchy sounds
>> in
>> audio. This happens both with pots fitted in a product by a
>> manufacturer and with pots bought from a shop. Some become
>> defective
>> within a couple of months of regular use, especially in a
>> dusty
>> environment and/or if they have dc current passing through
>> them.
>> Replacing them with better quality pots is not always an
>> option.
>> Flushing with a solvent usually makes them OK again for a
>> while, but
>> this also takes out the lubricant and makes the track wear out
>> more
>> quickly.
>
>
> ** Totally mangled nonsense - the track of a carbon ( or
> other) pot
> has no lubricant applied during manufacture.

Maybe not within your experience, but some manufacturers
certainly do apply lubricants on the track. As a hobbyist, I've
opened up many varieties of vulume control type pots, both rotary
and slide. I opened some of them when they were quite new and
there's no time for the fine grease-like substance to migrate
from the support mechanism to the tracks.

> Any lubricant that resided on the track would prevent
> operation - cos
> lubricants are insulators.

That's why I had to ask about suitable substances. Some of them
were still working flawlessly with "grease" on the tracks when I
opened them. In most cases, the lubricant had been pushed into a
ridge right beside the wiper path.

>
> Rapidly evaporating solvents are rarely any use for fixing
> noisy
> pots while slow evaporating ones that leave a thin oil residue
> are
> very good at the job.

So, if "a thin oil resude" works, why not some other lubricant?

>
> Also, rotary pots do not get " dust " inside them.

They most certainly do. There are often enough gaps in the
housing to let dust in.

>
> What actually causes all the trouble is a when a mix of fine
> carbon
> particles from the track and grease from the shaft bearing
> accumulate
> on the fingers of the two wipers and render them partially non
> conducting. Also, the metal to metal wiper contacts suffer
> from
> surface contamination by the moisture and sulphides in the
> air - a
> thin oily film helps prevent any recurrence of this. The oil
> must be
> thin that rotating the pot displaces all of it from the contact
> areas.
>
> A mix of oil and petroleum solvent has a very low surface
> tension so
> easily travels by capillary action to cover all the insides of
> a pot.
>
> There is a very famous product that fits the bill exactly
> ...... W
> something ......
>
> One uses only a small amount ( a few drops) and then rotates
> the pot
> many times to help it do the trick - repeating the process
> only if
> necessary. If the pot is still noisy - replacement is the only
> option.

As I said at the beginning, it is sometimes difficult to get a
replacement of the same type. Gone are the days when most volume
control pots were of about one-inch
diameter, with a 1/4-inch steel shaft and eyelet solder tags,
secured to a metal chassis with a nut.

>
> BTW
>
> Some 100mm fader pots I looked at a week back did not respond
> to the
> above treatment - when opened up I found the finger contacts
> on the
> slider were worn completely away !!!

I've come across such wear effects too, but that's not what I was
talking about. What I did mention was that they wear more rapidly
without lubricant.


From: Phil Allison on 14 Mar 2010 05:49

"pawihte"

>> ** Totally mangled nonsense - the track of a carbon ( or other) pot has
>> no lubricant applied during manufacture.
>
> Maybe not within your experience, but some manufacturers certainly do
> apply lubricants on the track.

** Bollocks.


>> Any lubricant that resided on the track would prevent operation - cos
>> lubricants are insulators.
>
> That's why I had to ask about suitable substances. Some of them were still
> working flawlessly with "grease" on the tracks when I opened them. In most
> cases, the lubricant had been pushed into a ridge right beside the wiper
> path.

** Then there is NONE lubricating the conducting surfaces !!!!

You earlier claim is 100% bogus.


>> Also, rotary pots do not get " dust " inside them.
>
> They most certainly do.


** Utter bollocks.


>> If the pot is still noisy - replacement is the only option.
>
> As I said at the beginning, it is sometimes difficult to get a replacement
> of the same type.


** Your problem.


> I've come across such wear effects too, but that's not what I was talking
> about. What I did mention was that they wear more rapidly without
> lubricant.

** There can be NONE on the conducting surfaces.

Your thinking is totally irrational.

And you're an arrogant pig.



...... Phil




From: pawihte on 14 Mar 2010 06:15
Phil Allison wrote:
> "pawihte"
>
>>> ** Totally mangled nonsense - the track of a carbon ( or
>>> other)
>>> pot has no lubricant applied during manufacture.
>>
>> Maybe not within your experience, but some manufacturers
>> certainly do
>> apply lubricants on the track.
>
> ** Bollocks.
>
>
>>> Any lubricant that resided on the track would prevent
>>> operation - cos lubricants are insulators.
>>
>> That's why I had to ask about suitable substances. Some of
>> them were
>> still working flawlessly with "grease" on the tracks when I
>> opened
>> them. In most cases, the lubricant had been pushed into a
>> ridge
>> right beside the wiper path.
>
> ** Then there is NONE lubricating the conducting surfaces
> !!!!
>
> You earlier claim is 100% bogus.
>
>
>>> Also, rotary pots do not get " dust " inside them.
>>
>> They most certainly do.
>
>
> ** Utter bollocks.
>
>
>>> If the pot is still noisy - replacement is the only option.
>>
>> As I said at the beginning, it is sometimes difficult to get a
>> replacement of the same type.
>
>
> ** Your problem.
>
>
>> I've come across such wear effects too, but that's not what I
>> was
>> talking about. What I did mention was that they wear more
>> rapidly
>> without lubricant.
>
> ** There can be NONE on the conducting surfaces.

Not at the point of contact at the time of contact, at least not
in enough thickness to prevent conduction.What about oil-filled
switches and contactors, eh? The oil or grease simply gets
squeezed out of the way at the point of contact and then flow in
again.

>
> Your thinking is totally irrational.
>
> And you're an arrogant pig.

At least you're consistent. Did mommy forget to give you your
medicine again? Good. Don't ever change. You're good for comic
relief.


From: Phil Allison on 14 Mar 2010 06:29


"pawihte"

Your thinking is totally insane.

And you're a pig ignorant turd.

Drop dead.



...... Phil





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