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Actually I am betting on congealed oil in the bearings. About the only cure for this is to dissolve it with new oil. The right way to do it would be to tear down the motor and clean out the bearings with kerosene but that's a lot more work then a couple of drops of oil. Dan. Some of those box fans place a resistor in series to cause more slippage in the induction motor and let the fan run slow. This works with a fan because the load on the motor is always the same at a given speed. The resistor is usually not recognizable as a resistor but is distributed along the cable connecting the switch to the motor. In such a fan the cable will feel slightly warm after prolonged operation at medium or slow speed. The distributed resistor can become open, that is, burned out, although there is not likely to be any burned smell or scorched insulation. The fan might be repaired by replacing the resistance cable with a discrete resistor. A more usual way of changing the speed of a fan is to have taps on the motor winding. Such tapped windings are more expensive to manufacture than a simple coil. Which method is used is an economic decision by the manufacturer. Whether a tapped motor winding or a resistance cable costs more. Regards. Max. K 4 O D S. Email: [EMAIL PROTECTED] Transistor site http://www.funwithtransistors.net Vacuum tube site: http://www.funwithtubes.net Music site: http://www.maxsmusicplace.com To subscribe to the fun with tubes group send an email to, [EMAIL PROTECTED] ----- Original Message ----- From: "Dan Rossi" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Wednesday, August 16, 2006 10:47 AM Subject: Re: [BlindHandyMan] Fan maintenance > Just out of curiosity, can Max or Tom shed a bit more light on the fan > subject? I wonder if it is not something electronic and not just > mechanical, such as burned out coils on the transformer or something like > that. > > I also had a big box fan that I ran every night for white noise. I ran it > on medium speed for years. After a long time, if I turned the fan on > medium it would not start turning. I could possibly feel a bit of > vibration like it might sort of been trying to turn, but it just wouldn't > get started. However, if I turned it on low or high, it worked just fine. > If I turned it on high, let it get started, then turned it to medium, > sometimes it would stay going, but more often than not it would just slow > to a stop. > > Later. > > -- > Blue skies. > Dan Rossi > Carnegie Mellon University. > E-Mail: [EMAIL PROTECTED] > Tel: (412) 268-9081 > > > To listen to the show archives go to link > http://acbradio.org/handyman.html > or > ftp://ftp.acbradio.org/acbradio-archives/handyman/ > > The Pod Cast address for the Blind Handy Man Show is. > http://www.acbradio.org/news/xml/podcast.php?pgm=saturday > > The Pod Cast address for the Cooking In The Dark Show is. > http://www.gcast.com/u/cookingindark/main.xml > > Visit The New Blind Handy Man Files Page To Review Contributions From > Various List Members At The Following Address: > http://www.jaws-users.com/handyman/ > Visit the new archives page at the following address > http://www.mail-archive.com/[email protected]/ > For a complete list of email commands pertaining to the Blind Handy Man > list just send a blank message to: > [EMAIL PROTECTED] > Yahoo! Groups Links > > > > > > > > To listen to the show archives go to link http://acbradio.org/handyman.html or ftp://ftp.acbradio.org/acbradio-archives/handyman/ The Pod Cast address for the Blind Handy Man Show is. http://www.acbradio.org/news/xml/podcast.php?pgm=saturday The Pod Cast address for the Cooking In The Dark Show is. http://www.gcast.com/u/cookingindark/main.xml Visit The New Blind Handy Man Files Page To Review Contributions From Various List Members At The Following Address: http://www.jaws-users.com/handyman/ Visit the new archives page at the following address http://www.mail-archive.com/[email protected]/ For a complete list of email commands pertaining to the Blind Handy Man list just send a blank message to: [EMAIL PROTECTED] Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/blindhandyman/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
