Date: Fri Mar 20 17:36:01 2009 Back to Contents ------------------------------------------------------------------------

Author: Bill Norwood

Subject: Re: Driven Harmonic Motion Analyzer, PASCO, Brushes

Post:

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Hi Taplers,=20

=20

Re: trouble-shooting the contact brushes in our PASCO Driven Harmonic =
Motion Analyzer ME-9210A

=20

The geometry is attached (photos)

(Only the copy that is going to Bernard has the attachments. Will =
provide you a copy on request)

=20

I have read most of the link Bernard Cleyet provided about maintaining =
motor brushes,=20

=
http://www.uiitraining.com/b51a/300/3201and36021.htm

and see that silicon from a variety of sources can form an insulating =
film

=20

But I learn from: =
=
http://www.hifigear.co.uk/site/scripts/product_browse.php?category_id=3D&=
product_id=3D3862

that the DeoxIT we sometimes use on these contacts removes silicon.

Description they provide: Caig produce two products ideal for audio and =
AV use, these are DeoxIT and ProGold. DeoxIT is a contact cleaner =
featuring a fast-acting deoxidizing solution that cleans, preserves and =
lubricates as well as improving the conductivity on all metal connectors =
and contacts. DeoxIT is recommended for surfaces that have oxidation or =
corrosion. Even brand new audio or AV products benefit from their =
contacts being cleaned, as the connectors are often machined using =
silicon oil which is left to dry on after the manufacturing process.

BN? But why do the DeoxIT-soaked contacts still fail after a few hours =
of use or after a few months of sitting?

=20

But Erich Burton says,

Not sure about cleaning the brushes; I haven't had to do that in a =
while. I did have to replace a couple of the LEDs a while back, but I =
haven't opened one of those units up lately.

BN? Why doesn=E2=80=99t he have to clean his contacts regularly??

=20

And Jerry Hester smells something amiss,

Hmmm,
It seems that all kinds of electric motors use carbon brushes and run =
for years with no problems.
What is different in your setup?

BNR: Certainly much lower speeds, and the usage of steel and brass as =
the rotating surfaces, and, perhaps it matters that they are used in =
only one lab which runs these machines for just a week 3 times a year.

=20

And Bernard Cleyet writes,

Do not use solvents!...

I used chalk on a=EF=BF=BDmotor-generator=EF=BF=BDpowering a Beta-ray =
spectrometer (cylindrical type).

BN?: What=E2=80=99s wrong with solvents? DeoxIT is a solvent? How does =
chalk work?

=20

And LeRoy Frahm writes,

Bill,

On all my rotating or moving electrical contacts, I use a product =
that is a conducting

lubricant and cleaner to restore good contact and reduce arcing. What I =
use is Rawn

Aero 2000, Cleaner Lube. I get it from a local electronics supplier, I'm =
sure there are

other brands, but this works great and made in a small local town =
(Spooner) in Wisconsin.

There number is 1-800-826-6791.

All the Best,

LeRoy

BN? Why would this be any different from the DeoxIT in our application?

=20

=20

Many thanks for your brainstorming on this.

=20

Bill Norwood

U of MD at College Park

=20

=20

_____ =20

From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On =
Behalf Of Bernard Cleyet
Sent: Thursday, March 19, 2009 4:23 PM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Driven Harmonic Motion Analyzer, PASCO, Brushes

=20

I discover I didn't attache the link.

=20

=
http://www.uiitraining.com/b51a/300/3201and36021.htm

=20

bc

=20

=20

On 2009, Mar 19, , at 11:09, Bernard Cleyet wrote:

=20

Do not use solvents! (I don't know the geometry.)

=20

=
http://www.morganamt.com/pdf/TB11_DustRemoval.pdf

=20

I used chalk on a motor-generator powering a Beta-ray spectrometer =
(cylindrical type).

=20

Here's a rather detailed servicing of a motor generator. You may be =
having a problem w/ eccentricity. Note the instruction for resurfacing. =
[Go to cleaning slip rings.]

=20

Note: improper pressure, if the brush is worn the pressure may be too =
low. I suspect proper pressure results in self cleaning. Is the ambience =
high humidity?

=20

bc read just enuf to think should send

=20

=20

=20

=20

On 2009, Mar 19, , at 08:10, Bill Norwood wrote:

=20

Hi Taplers,

Back again with the PASCO ME-9210A Driven FHM Analyzer:

Due to dimming and eventual non-lighting of the rotating LED,

We must frequently clean the sliding contacts,

which uses up too much time and disrupts the labs.

One contact is carbon-to-steel (brush against rotating shaft)

Other contact is carbon-to-brass (brush against rotating annular ring)

cut


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Hi Taplers, =



=

Re: trouble-shooting the contact = brushes in our PASCO Driven
Harmonic = Motion Analyzer ME-9210A



=

The geometry is attached = (photos)

(Only the copy that is going to = Bernard has the attachments. Will
provide you a copy on = request)



=

I have read most of the link = Bernard Cleyet provided about
maintaining motor brushes, =

http://www.uiitraining.com/b51= a/300/3201and36021.htm
<3D"http://www.uiitraining.com/b51a/300/3201and36021.htm">

and see that silicon from a = variety of sources can form an
insulating film



=

But I learn from: http://www.hifigear.co.uk/site=
/scripts/product_browse.php?category_id=3D&product_id=3D3862
<3D"http://www.hifigear.co.uk/site/scripts/product_browse.php?categor=>

that the DeoxIT we sometimes use = on these contacts removes silicon.

Description they provide: Caig = produce two products ideal for
audio and AV use, these are DeoxIT and ProGold. = DeoxIT is a
contact cleaner featuring a fast-acting deoxidizing solution that =
cleans, preserves and lubricates as well as improving the
conductivity on all = metal connectors and contacts. DeoxIT is
recommended for surfaces that have = oxidation or corrosion. Even
brand new audio or AV products benefit from their = contacts being
cleaned, as the connectors are often machined using silicon oil =
which is left to dry on after the manufacturing = process.

BN? But why do the = DeoxIT-soaked contacts still fail after a few
hours of use or after a few months of = sitting?



=

But Erich Burton = says,

Not sure about cleaning the = brushes; I haven't had to do that in a
while. I did have to replace a couple of the = LEDs a while back,
but I haven't opened one of those units up = lately.

BN? Why doesn=E2=80=99t he = have to clean his contacts regularly??



=

And Jerry Hester smells something = amiss,

Hmmm,
It seems that all kinds of electric motors use carbon brushes and
run = for years with no problems.
What is different in your setup?

BNR: Certainly much lower speeds, = and the usage of steel and brass
as the rotating surfaces, and, perhaps it = matters that they are
used in only one lab which runs these machines for just a week = 3
times a year.



=

And Bernard Cleyet = writes,

Do not use = solvents!...

I used chalk on = a=EF=BF=BDmotor-generator=EF=BF=BDpowering a =
Beta-ray spectrometer (cylindrical type).

BN?: What=E2=80=99s wrong = with solvents? DeoxIT is a solvent? How
does chalk work?



=

And LeRoy Frahm = writes,

Bill,

On all my = rotating or moving electrical contacts, I use a
product that is a = conducting

lubricant and cleaner to restore = good contact and reduce arcing.
What I use is = Rawn

Aero 2000, Cleaner Lube. I get it = from a local electronics
supplier, I'm sure there = are

other brands, but this works great = and made in a small local town
(Spooner) in Wisconsin.

There number is = 1-800-826-6791.

All the = Best,

= LeRoy

BN? Why would this be any = different from the DeoxIT in our
application?



=



=

Many thanks for your brainstorming = on this.



=

Bill = Norwood

U of MD at College = Park



=



=
------------------------------------------------------------------------

From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu]
On Behalf Of Bernard Cleyet
Sent: Thursday, March 19, 2009 4:23 PM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Driven Harmonic Motion Analyzer, PASCO, = Brushes



=

I discover I didn't attache the = link.



=

http://www.uiitraining.com/b51= a/300/3201and36021.htm
<3D"http://www.uiitraining.com/b51a/300/3201and36021.htm">



=

bc



=



=

On 2009, Mar 19, , at 11:09, = Bernard Cleyet wrote:



Do not use solvents! (I don't know = the geometry.)



=

http://www.morganamt.com/pdf/T= B11_DustRemoval.pdf
<3D"http://www.morganamt.com/pdf/TB11_DustRemoval.pdf">



=

I used chalk on a motor-generator powering a Beta-ray spectrometer
(cylindrical = type).



=

Here's a rather detailed servicing = of a motor generator. You may
be having a problem w/ eccentricity. Note the instruction for
resurfacing. [Go to cleaning slip = rings.]



=

Note: improper pressure, if the = brush is worn the pressure may be
too low. I suspect proper pressure results in = self cleaning. Is
the ambience high humidity?



=

bc read just enuf to think should = send



=



=



=



=

On 2009, Mar 19, , at 08:10, Bill = Norwood wrote:



Hi Taplers,

Back again with the = PASCO ME-9210A = Driven FHM Analyzer:

Due to dimming and = eventual non-lighting of the rotating = LED,

We must frequently clean the = sliding contacts,

which uses up too much time and = disrupts the labs.

One contact is = carbon-to-steel (brush against rotating shaft)

Other contact is carbon-to-brass = (brush against rotating annular ring)

cut



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From tap-l-owner@lists.ncsu.edu Fri Mar 20 17:36:01 2009

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