"Sylvia Else" wrote in message
...
On 10/02/2011 11:23 AM, Metro wrote:
"Sylvia wrote in message
...
I had occasion to dismantle a cheap pedestal fan the other day (Coles
Home
Collection). It hadn't failed, but I wanted to see how it was wired up
(that's another story).

The cover to the button panel was held in place by four screws which
were
identical except that two were philips head type, and the other two had
a
triangular socket in the head.

I have bits to cope with most things I've encountered, but not those.
What's the point? Are they worried about competition for repairing these
$10 fans?

Do consumers regularly electrocute themselves by taking fans apart
without
knowing what they're doing?

Sylvia.

They are only a tamperproof head of which there are various and easily
available.. Wait until you come across a coffin head screw.I believe the
reason for using them is that some countries prevent the dismantle of an
appliance without the use of a tool or special tool so this way all
fields
are covered in one assembly. Did you find out how it worked. They are
made
to break. Best way to keep them longer is to keep the Blades clean and
lubricate the bearings NOT with WD40 or the like.

As I said, it hadn't broken. I was actually trying to figure out which
wire was which leading to the induction motor. I had in mind making it run
backwards. Aerofoils don't perform as well backwards, but they do perform.
However, on further consideration I realised that the fan blades would be
aerodynamically stalled if the fan ran backwards, with the result that it
would probably not work much at all.


If the fan is symetrical - snap off pairs of opposing blades.

Doesn't matter if there's only 6 to start with - some helicopters have
"scissor" tail rotors.