Date: Thu Mar 19 14:39:39 2009 ** **Back to Contents ** ------------------------------------------------------------------------ **

Author: Bernard Cleyet

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

Post:


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

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

I used chalk on a motor-generator powering a Beta-ray spectrometer =20
(cylindrical type).

Here's a rather detailed servicing of a motor generator. You may be =20=

having a problem w/ eccentricity. Note the instruction for =20
resurfacing. [Go to cleaning slip rings.]

Note: improper pressure, if the brush is worn the pressure may be =20
too low. I suspect proper pressure results in self cleaning. Is the =20=

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)
>
> We have tried:
> - alcohol & cue tip or rag.
> - Scotchbrite abrasion
> - DeoxIT-D5
>
> We have NOT yet tried suggestions by our local motor guys:
> - pencil eraser
> - omitting the carbon and just using metal-to-metal, since it is =20
> low speed.
>
> Anyone got any ideas
> as to how we could modify this apparatus
> so that no such maintenance would be required?
>
> I can send larger versions of the below pics on request.
>
> Many thanks, Bill Norwood, U of MD at college Park
>
>
=EF=BF=BC=EF=BF=BC=EF=BF=BC

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**
**Do not use solvents! =A0(I = don't know the geometry.)**
**
**
**http://www.morg= anamt.com/pdf/TB11_DustRemoval.pdf**
**
**
**I used = chalk on a=A0motor-generator=A0powering a Beta-ray
spectrometer = (cylindrical type).**
**
**
**Here's a rather detailed = servicing of a motor generator. =A0 You may
be having a problem w/ = eccentricity. =A0Note the instruction for
resurfacing. [Go to cleaning = slip rings.]**
**
**
**Note: =A0improper pressure, if the = brush is worn the pressure may be
too low. =A0I suspect proper pressure = results in self cleaning. =A0Is
the ambience high = humidity?**
**
**
**bc read just enuf to think should = send**
**
**
**
**
**
**
**
**
**On = 2009, Mar 19, , at 08:10, Bill Norwood wrote:**
**
**

**Hi = Taplers,**
**=A0PASCO=A0ME-9210A Driven FHM = Analyzer:**
**Due = to dimming and eventual non-lighting of the rotating = LED,**
**We = must frequently clean the sliding = contacts,**
**One = contact is carbon-to-steel (brush against rotating = shaft)**
**We = have tried:**
**- = alcohol & cue tip or rag.**
**- Scotchbrite = abrasion**
**- = DeoxIT-D5**
**We = have NOT yet tried suggestions by our local motor = guys:**
**- = pencil eraser**
**- = omitting the carbon and just using metal-to-metal, since it is
low = speed.**
**as to how we could modify this = apparatus**
**so = that no such maintenance would be = required?**
**I = can send larger versions of the below pics on = request.**
**=A0college = Park**
**=A0**
**=A0**
**<= /font>**

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SEnyo82aVz//2Q== --Apple-Mail-15--666567303--
--Apple-Mail-14--666567303-- From tap-l-owner@lists.ncsu.edu Thu Mar 19
14:39:39 2009 **

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