Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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  #21   Report Post  
Old September 11th 07, 04:01 AM posted to sci.electronics.basics,sci.electronics.repair,rec.crafts.metalworking,alt.engineering.electrical
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Default how to bypass dremel tool internal variable speed control?

On Mon, 10 Sep 2007 21:39:17 -0400, Claude Desjardins
wrote:


I took a look at google images for his model and the dimmer really is
just a dimmer ... providing they sell brushes kits (2) for his model,
the principle was ok from the first post; plug it right to the input.

If the person who originally posted the question still follows the
discussion; it is strongly suggested that you do NOT use the tool wired
that way for too long as the motor will overheat and break (or some of
its internals will melt down)... take it as a temporary fix only.



Or do like I did. I took a 600 watt dimmer and put it in a project box
with a cord on one end, and a receptacle on the other. I use it to
control the speed of dremel type tools (anything with universal motor
under about 400 watts) and to regulate output of my soldering iron.
Also comes in handy to dim the occaisional lamp.

As long as you don't run it wide open for long periods of time it will
last as long as if you had the built-in speed control. My luck with
Dremels has been terrible. The cheap chinese crap lasts just as long,
for 1/4 the price. Much as I hate chinese crap.

--
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Old September 11th 07, 04:42 AM posted to sci.electronics.basics,sci.electronics.repair,rec.crafts.metalworking,alt.engineering.electrical
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Default how to bypass dremel tool internal variable speed control?

after you make your temporary repair, dremel sells all the parts you might
need for a nominal cost if you call customer service.


wrote in message
ups.com...
Thanks, folks. This discussion is exactly the type of info I
needed.


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Old September 11th 07, 07:38 AM posted to sci.electronics.basics,sci.electronics.repair,rec.crafts.metalworking,alt.engineering.electrical
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Default how to bypass dremel tool internal variable speed control?

clare at snyder.on.ca wrote:


Or do like I did. I took a 600 watt dimmer and put it in a project box
with a cord on one end, and a receptacle on the other. I use it to
control the speed of dremel type tools (anything with universal motor
under about 400 watts) and to regulate output of my soldering iron.
Also comes in handy to dim the occaisional lamp.

As long as you don't run it wide open for long periods of time it will
last as long as if you had the built-in speed control. My luck with
Dremels has been terrible. The cheap chinese crap lasts just as long,
for 1/4 the price. Much as I hate chinese crap.



I was like that once - long ago.

Then I got my first DIE GRINDER!

OOOOOoooohhhh Baby.

Atomic powered Dremel.

What a TOOL to have in hand. Oh, The POWER!

But warning - this dude ain't for balsa wood, kiddies.

And you probably outta practice on something else before trimming those
gnarly toe nails...


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Old September 11th 07, 05:14 PM posted to sci.electronics.basics,sci.electronics.repair,rec.crafts.metalworking,alt.engineering.electrical
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Default how to bypass dremel tool internal variable speed control?

On Sep 10, 11:55 am, Jamie
t wrote:
wrote:
Unfortuantely it doesn't seem that simple. The speed control has what
looks like a some kind of semiconductor/IC (3 leads), a diode, and
maybe a fixed resistor in addition to the slide pot. I don't know if
they're doing pulse width modulation or what.


That's a simple phase control SCR circuit.
the diode is a DIAC.. etc..
if it's not firing, I would check the pot and
resistor.


Trace it with a volt meter. Probably a bad solder job and the heat
from the controller loosened something up. Easy fix if you have a
decent iron.

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Old September 11th 07, 09:44 PM posted to sci.electronics.basics,sci.electronics.repair,rec.crafts.metalworking,alt.engineering.electrical
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Default how to bypass dremel tool internal variable speed control?

On Mon, 10 Sep 2007 23:01:45 -0400, clare at snyder.on.ca
wrote:

snip
Or do like I did. I took a 600 watt dimmer and put it in a project box
with a cord on one end, and a receptacle on the other. I use it to
control the speed of dremel type tools (anything with universal motor
under about 400 watts) and to regulate output of my soldering iron.
Also comes in handy to dim the occaisional lamp.

As long as you don't run it wide open for long periods of time it will
last as long as if you had the built-in speed control. My luck with
Dremels has been terrible. The cheap chinese crap lasts just as long,
for 1/4 the price. Much as I hate chinese crap.


More China crap...

You can get a Router Speed Control from Harbor Freight for
~$13 on sale pretty often.

"ROUTER SPEED CONTROL

Get better results and longer bit life when routing tough
woods, plastics, even aluminum. Plug your router into the
control unit and you instantly have a variable-speed tool.
Works with any universal AC/DC brush type motor, 15 amps and
under. Will not work with soft- or slow-start motors.

ITEM 43060-1VGA"

See:

http://www.harborfreight.com/cpi/cta...emnumber=43060

I have one and it works okay with my die grinder, drill,
table saw (cheapo, has universal motor), 4 inch angle
grinder...

Your going to have a hard time building one cheaper than
this and have it look and work as well.

--
Leon Fisk
Grand Rapids MI/Zone 5b
Remove no.spam for email


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Old September 12th 07, 12:07 AM posted to sci.electronics.basics,sci.electronics.repair,rec.crafts.metalworking,alt.engineering.electrical
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Default how to bypass dremel tool internal variable speed control?

On Sep 10, 12:06 pm, "Michael A. Terrell"
wrote:

BTW, have you seen the small DC powered clone at Harbor Freight? It
runs on 12 VDC, and comes with an AC adapter. I was thinking about
using one (or more, with different sized drills) with a homebrew CNC
machine to drill PC boards.


I have one of those HF pseudo-dremels. Not very torque-y at all. Bogs
down very easily. A very light touch is required.

Jerry

  #27   Report Post  
Old September 12th 07, 12:15 AM posted to sci.electronics.basics,sci.electronics.repair,rec.crafts.metalworking
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Default how to bypass dremel tool internal variable speed control?

Jerry ) writes:
On Sep 10, 12:06 pm, "Michael A. Terrell"
wrote:

BTW, have you seen the small DC powered clone at Harbor Freight? It
runs on 12 VDC, and comes with an AC adapter. I was thinking about
using one (or more, with different sized drills) with a homebrew CNC
machine to drill PC boards.


I have one of those HF pseudo-dremels. Not very torque-y at all. Bogs
down very easily. A very light touch is required.

But that's the point, those things have really high speed to do the
work, and you shouldn't be using much pressure.

Try sawing through a bolt. You'd have to use the hacksaw and lots
of pressure. Put a cutoff wheel in the "rotary tool", and you barely
need to apply any pressure. The first time I tried a cutoff wheel
in one of those things was the day I realized how wonderful they
were.

Now, your cheap one may have other problems. But a light touch
is what's required with "rotary tools" anyway.

Michael

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Old September 12th 07, 02:32 AM posted to sci.electronics.basics,sci.electronics.repair,rec.crafts.metalworking,alt.engineering.electrical
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Default how to bypass dremel tool internal variable speed control?

On Tue, 11 Sep 2007 01:38:45 -0500, cavelamb himself
wrote:

clare at snyder.on.ca wrote:


Or do like I did. I took a 600 watt dimmer and put it in a project box
with a cord on one end, and a receptacle on the other. I use it to
control the speed of dremel type tools (anything with universal motor
under about 400 watts) and to regulate output of my soldering iron.
Also comes in handy to dim the occaisional lamp.

As long as you don't run it wide open for long periods of time it will
last as long as if you had the built-in speed control. My luck with
Dremels has been terrible. The cheap chinese crap lasts just as long,
for 1/4 the price. Much as I hate chinese crap.



I was like that once - long ago.

Then I got my first DIE GRINDER!

OOOOOoooohhhh Baby.

Atomic powered Dremel.

What a TOOL to have in hand. Oh, The POWER!

But warning - this dude ain't for balsa wood, kiddies.

And you probably outta practice on something else before trimming those
gnarly toe nails...

I've got a good air powered one of those for the "serious stuff" but
the crappy dremels don't even stund up th the "balsa and toenails"
type jobs.

--
Posted via a free Usenet account from http://www.teranews.com

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Old September 12th 07, 02:35 AM posted to sci.electronics.basics,sci.electronics.repair,rec.crafts.metalworking,alt.engineering.electrical
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Default how to bypass dremel tool internal variable speed control?

On Tue, 11 Sep 2007 16:44:37 -0400, Leon Fisk
wrote:

Your going to have a hard time building one cheaper than
this and have it look and work as well.

Built mine about 15 or more years ago in a $2 surplus project box,
using the cord from an old iron and the receptacle from an old
stove-top with a dimmer I picked up in a box of stuff at an auction. I
think total cast was $5 or less and it STILL looks and works just
fine.

--
Posted via a free Usenet account from http://www.teranews.com

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