Nuisance fastners - winge

I just used a small flat blade screwdriver to remove them. Got to be the right size though to jam along one flat of the triangle.

-- Sell your surplus electronic components at

Well, I got one of them undone using a tri-wing bit, but stripped the other attempting to do the same thing. However, I managed to see what I wanted to see.

Sylvia.

attempting to do the same thing. However, I managed to

Which was ? Is there a point to this thread apart from the type of screw you couldn't screw ?

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And how was it wired up ?

screw ?

The point is stupid is as stupid does (syliva) the screws are the manufactures way of saying no user serviceable parts do not open

I'm reminded of an old Rodriguez cartoon in Popular Electronics.

First panel: On a large speaker cabinet. "to prevent shock do not remove cover"

Second panel: Owner taking out a LOT of screws.

Third panel: Owner on floor clutching chest. Inside of huge cabinet has 2" transistor radio speaker inside.

Jeff

screw ?

It is their lawyer's way of attempting to avoid lawsuits.

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.

Metro

In a particular way.

Sylvia.

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.

Sylvia.

screw ?

Not really. The word "winge" in the subject line should have hinted at that.

Sylvia.

Did it work?

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.

Did you sue them?

That's not going to fix the problem of the blades being stalled.

What I would really need to do is fit the one-piece fan blade assembly on back to front (as well as reversing the motor), but the fan blade assembly is not designed to be attached the other way around.

Sylvia.

If it is a shaded-pole induction motor, it will not be possible to run it in reveres unless you dismantle the whole assembly and put the stator in the other way around. It would be more effective to get a spare fan boss and make new blades for it.

(I have made a shaded-pole gramophone motor run backwards, but I had to completely rebuild it and add extra windings to make it work.)

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Might sound silly, but cant the entire fan head (including motor) be rotated 180 degrees, or do you want the air intake without the motor in the way ?

It's not shaded pole. It has two sets of windings perpendicular to each other, and a capacitor which I believe is in series with one set of windings.

Sylvia.

The application is to suck cool air in through an open window at night. During the recent heat wave, it was noticeable that even though the temperature outside drops at night, the temperature of the house doesn't drop that much. The problem is lack of air flow.

A conventional pedestal fan blows in such a direction that when it's placed as near as possible to a window, the fan blades are still quite a way from the cool air, and so the result is not as effective as it might be. If I could reverse the direction of flow, then I could also turn then fan around, so that the blades would be much closer to the window.

I considered simply building a duct, but the cost of materials was excessive.

I'm thinking of using box fans instead.

Sylvia.