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RE: [TCML] LTR/STR and spark length
I agree - I'm not sure I see any reason to throttle down power to a FAN. Unlike a vacuum cleaner motor, fans don't put out a huge amount of air, make a lot of noise, or draw a lot of power. A fan should be good to go as-is.
Regards, Gary Lau
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of bartb
> Sent: Tuesday, March 04, 2008 10:10 PM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] LTR/STR and spark length
> Yes, but a dimmer for a fan speed control is fine (if desired).
> I would personally use a mechanical means unless electronic control was
> either required or cheaper (work ethic mostly).
> G Hunter wrote:
> > Lamp dimmers have some limited uses in coiling. I
> > have found that cheap, 120vac/600W lamp dimmers sold
> > at Wal-Mart and similar outlets make dandy speed
> > controls for vacuum cleaner motors (used on sucker
> > gaps). I have also used dimmers as speed controls for
> > asynchronous rotary spark gaps based on universal-type
> > brush motors. One ARSG was based on an angle grinder.
> > Another was based on a small Black & Decker router.
> > Dimmers controlled these with no issues. Lastly, a
> > dimmer and a series motor run capacitor work well for
> > exciting a 12v car ignition coil from a 120vac outlet.
> > I've tried this with various caps and ignition coils,
> > and it has always worked with no damage to the dimmer.
> > Not all motors will tolerate a dimmer. Most AC
> > induction motors--even the cheap little shaded pole
> > motors--will seize up when placed in series with a
> > dimmer. I've never ruined a motor or a dimmer this
> > way--the motors simply refused to rotate and made
> > scary buzzing sounds.
> > On the other hand, most brush-type "universal" motors
> > used in vacuum cleaners and many common power tools
> > respond very smoothly to dimmer speed control.
> > My cheesy, homebrew secondary coil winding jig uses a
> > gear motor from an ice cream maker (low RPM, lotsa
> > torque, great for coil winding). Unfortunately, the
> > little shaded pole induction motor inside the thing
> > balks at dimmer speed control--won't budge. With a
> > 10A variac in series, the thing can be smoothly
> > throttled across its whole RPM range. Sometimes, you
> > just gotta bite the bullet and shell out for a variac.
> > Cheers,
> > Greg
> > --- neal@xxxxxxxxxxxxxxxx wrote:
> >> Hi Scott,
> >> You think a dimmer wouldn't work properly even on a
> >> cooling fan? I do have a
> >> smaller (5 amp)variac that I could use, but like
> >> previously suggested, I may
> >> not adjust the flow at all. If I had to, I could go
> >> the baffle route. I've
> >> heard this before about dimmer switches. What is the
> >> problem with them, in
> >> relation to coils? Thanks for your help,
> >> Neal.
> >> Quoting Scott Bogard <teslas-intern@xxxxxxxxxxx>:
> >>> Neal,
> >>> Never use a dimmer with anything coil
> >> related, it will not work
> >>> properly. Many of us have been down this road, it
> >> never ends well.
> >>> Either buy a variac, or in this circumstance I
> >> would suggest that you
> >>> just build a baffle like Bart said. It can be as
> >> simple as a piece of
> >>> cardboard taped to the back or your fan covering
> >> it partly. Best of luck!
> >>> Scott Bogard.
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