[SEL] My 2 cents worth

[David Rotigel]

I'm still in favor of Ted Brookover's method of testing a magnet using  
ONLY a screwdriver!
	Dave

On Feb 19, 2010, at 9:02 PM, Ed Stoller wrote:

> I have a calibrated sensor ( A3516LUA) made by  Allegro Micro  
> Systems and
> distributed by Newark, I think I special ordered it. It has been a  
> while;
> the Calibration table is dated 1997. It is too early to know if I am  
> going
> to Portland, Ind, but it would be easy to bring.
>
> I am not satisfied with the 9 Volt battery source as I have to check  
> to see
> if the battery is going dead. I would like to use a 12 Volt battery  
> and
> Zener diode to substitute for it.
>
> Ed Stoller
> New Fairfield, CT
> http://home.earthlink.net/~edstoller/
> ----- Original Message -----
> From: "Elden DuRand" <edurand at mchsi.com>
> To: "The SEL email discussion list" <sel at lists.stationary-engine.com>
> Sent: Friday, February 19, 2010 7:14 PM
> Subject: Re: [SEL] My 2 cents worth
>
>
>> Ed:
>>
>> Do you have a source for calibrated Hall sensors?  I think my  
>> supplier,
>> Sprague, is out of the business.  I'd like to have a source to post  
>> on my
>> site.
>>
>> Take care - Elden
>> http://www.oldengine.org/members/durand
>>
>>> -----Original Message-----
>>> From: sel-bounces at lists.stationary-engine.com
>>> [mailto:sel-bounces at lists.stationary-engine.com]On
>>> Behalf Of Ed Stoller
>>> Sent: Friday, February 19, 2010 04:23 PM
>>> To: The SEL email discussion list
>>> Subject: Re: [SEL] My 2 cents worth
>>>
>>>
>>> I am a little late here, just back from a trip.
>>>
>>> The kits ( about 15 of them) I distributed look
>>> like those in the earlier
>>> link, http://www.coolmagnetman.com/magmeter.htm ,
>>> but made with a PC board.
>>> I do have a bag of some less sensitive sensors as
>>> I found the ones we used
>>> too sensitive. The most recent use of mine was
>>> for mapping the ignition
>>> trigger magnets on an Onan engine.
>>>
>>> The original idea of measuring magneto magnets
>>> was a bust as those charging
>>> the magnets would stick them to an iron beam,
>>> pull them off and know if the
>>> magnet was charged or not. I think we might look
>>> at the idea of measuring
>>> the magnetism of the magnets when still installed
>>> in a magneto so we would
>>> not have to disturb the magnets that were good.
>>>
>>> Ed Stoller
>>> New Fairfield, CT
>>> http://home.earthlink.net/~edstoller/
>>>
>>>
>>> ----- Original Message -----
>>> From: "William Young" <wmlyoung at yahoo.com>
>>> To: "The SEL email discussion list"
>>> <sel at lists.stationary-engine.com>
>>> Sent: Wednesday, February 10, 2010 9:51 AM
>>> Subject: Re: [SEL] My 2 cents worth
>>>
>>>
>>> TO: Jacob
>>> From: Bill Young
>>> RE; Gauss meter & "quantifier"
>>> Reply to: jacob warner jacob.warner at pdahome.com>
>>> Yours of December 3, 2009, 7:49 AM TO, SEL net
>>>
>>>
>>>
>>>
>>> Elden, Have you collected any data on gauss
>>> measurements for different types
>>> of
>>> magnetos? Jacob
>>>
>>> Jacob-san, I quite agree with Elden's comments
>>> and wish to add a couple of
>>> my own.
>>> (1) I wanted a gauss meter in the worst way. I
>>> imagined that I had a real
>>> need for one because I was doing many EKs for the
>>> local lads, I could not
>>> find a distributor in Japan.
>>> (2) So I built my own gauss "quantifier."
>>> (A) On the wall, I fashioned an EK holder.
>>> (B) Just below the EK armature I mounted a hinged
>>> lever arm. But before
>>> mounting, I made notches every inch and numbered
>>> them from 1 to 30 beginning
>>> at the hinge.
>>> (C) Then I made an "S" hook which
>>> would connect the lever arm to armature.
>>> (3) The last step was to fashion a one lb. weight
>>> which could be moved away
>>> from the hinge in one inch increments. Thus my
>>> "quantifier" gave me an idea
>>> of comparative magnetism in terms of inch pounds
>>> rather than Gauss.
>>> (4) Years later a Japanese engine lad found a
>>> company in Tokyo that sold
>>> Gauss meters -- not cheap. I was so happy with my
>>> purchase; I gaussed
>>> everything. It was then that I became
>>> disillusioned. Put the probe on any
>>> spot of any magnet; note the reading. Now, move
>>> the probe a quarter inch in
>>> any direction. Guess what? Different reading.
>>> (5) My current thinking is that my $2
>>> "quantifier" was a more useful tool
>>> than the expensive meter. I was getting an
>>> average reading of magnetic
>>> strength rather than point to point readings.
>>> Elden-san, Did you ever find your Gauss meter a
>>> useful instrument?
>>> My greatest satisfaction? I was the only guy on
>>> the block with one. Also in
>>> village and city, maybe even in the county.
>>> Comments please. Bill
>>>
>>> ( I am in Thailand now using yahoo address:
>>> wmlyoung at yahoo.com )
>>>
>>>
>>>
>>>
>>>
>>>
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>>
>>
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