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'[EE]: Data on pager motors'
2001\02\16@192046 by Malcolm Whinfield

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I can't remember the internet site for this but I know that you cant easily
remove them counterweight. I tried. The counterweight seems to be fairly
soft though and could be cut off (carefully) but myself I wouldn't
experiment.

I have a couple myself.

Malcolm Whinfield

{Original Message removed}

2001\02\16@224800 by Roman Black

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Bob Ammerman wrote:
>
> I saw a website which recommended removing the counterweight as follows:
>
> 1: Clamp counterweight in a vise.

1. Don't squeeze the counterweight! Get an old pair of
pliers or side cutters and put them under the weight.
Not clamped on the shaft either. You don't want to
squeeze anything, just to support the pulley. Rest
the pliers on the vice or bench.


> 2: Fashion a 'pin punch' out of a paper clip (I would think cutting the tip
> off a small brad would work well.

2. Make a pin punch out of an old jewellers
screwdriver (the little chrome ones) by grinding
it's tip flat. These are good hard steel.

> 3: Insert pin punch in hole on end of weight

3. HEAT counterweight with a flame (lighter?)
or soldering iron. Get it nice and hot. It's
not being squeezed so this won't take long to do.

> 4: Tap punch to drive motor shaft out of weight.

4. When it's nice and hot it expands, then gentle
tapping down on the motor shaft will remove the
weight or pulley without bending the delicate shaft.
Most small metalpulleys are heat fitted, and
you need to heat-unfit them.

This technique also works well on nice stepper
motors that have pressed on metal pulleys.
In my second year as an apprentice I did 6 months
in the motor rebuild shop. Did motors of all sizes,
from tiny model train motors to motors as big
as a car. :o)
-Roman

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2001\02\17@060952 by Peter L. Peres

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The weight can be removed by crushing it gently in a desk vise at two
positions 90 degrees apart, then pull it off.

Motor data is almost impossible to obtain unless it is an OEM type similar
to one available in a catalog. R/C rocket glider fans often make their own
servos, so maybe they have data. Try to search for them on the web.

Peter

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2001\02\17@094922 by mike

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On Fri, 16 Feb 2001 18:54:55 -0500, you wrote:

>Hi all,
>
>Does anyone know where I could get data (e.g. torque vs. speed vs. current
>graphs or at least a few points) for the tiny pager motors? Also, how easy
>it is (usually) to remove the weight from the shaft?
Weight removal is pretty easy. The important thing is NOT to apply any
force to the motor itself. Support the weight with a thin plate between the motor and weight, and
use a thin rod (e.g. dead 1mm PCB drill) and a hammer to punch the
shaft out of the weight

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2001\02\19@050045 by J.Feldhaar

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Hi Sean,

you might try to look on the homepage of a big manufacturer in China, I am
using their model OTL-7AL for a special paging application. I have tested them
for average lifespan, and found their 100 hours to be very conservative, mine
ran abt. 600 hrs under test conditions. I am using them in lots of 1000, and
then they come at USD 0,80 approx.
Their page is http://www.kotl.com. The data sheet gives abt. 7000 rpm, current is 80
mA at 1.3 V, but no values given for torque (of course, because they use it
with the weight attached...).

Hope this helps...

Jochen Feldhaar DH6FAZ

"Sean H. Breheny" schrieb:

{Quote hidden}

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2001\02\19@051115 by Alan B. Pearce

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>Their page is http://www.kotl.com.

I get Error 403 - "the page is forbidden" when I try and access it. What did you
do to get access?

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2001\02\19@052156 by J.Feldhaar

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Hello Alan,

sorry, I didn't test this myself, just got it out of their catalogue. You might try
http://www.asiansources.com/jinlong.co for a data sheet and email contact. If desired, I
can also provide address, fax phone numbers and a contact...
So far they have proven to be reliable...

Jochen Feldhaar DH6FAZ

"Alan B. Pearce" schrieb:

> >Their page is http://www.kotl.com.
>
> I get Error 403 - "the page is forbidden" when I try and access it. What did you
> do to get access?
>
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