Self-aligning screw thread?

Methinks what you are looking for is called a "cork".

BTW, we teach our children the "turn it backwards" maneuver.

I only heard of it once, from my father when I was attempting to attach a lenshood onto a FED 4 35mm film camera, which has a very very fine thread.

BTW, it's manoeuvre.

What I'm looking for is an inventor to bring us into this century. I'm really not impressed with the devices we use today. On the one hand we have mobile phones which are more powerful than supercomputers a few decades ago, but then simple little things are still s*it. We still use the internal combustion engine for example. We can't cure the simplest of diseases. For goodness sake, priorities anyone?

In the ordinance business we had to unteach that trick for guys installing long time delay bomb fuses.

That’s not accurate with vaccination alone.

We’re doing fine with that with vaccination.

Some years ago there was a thred with three spirals on it. It was indeed hard to get it on badly.

I guess the self tapping screw was the solution they came up with, cheap and cheerful Brian

There are quite a few with two but mainly wood screws and you do not have to restart as often.

vaccination is not a cure, its a prophylactic.

The body cures simple diseases. All by itself.

Of course we can cure many others with antibiotics, but they have become so rare that no one gets them anymore.

Many cancers can be cured by chemotherapy.

'Commader Kinsey' is of course just another nym shift from a resident troll.

That sounds very useful, why aren't they all made like that?

They shouldn't call them self tapping because they rarely do unless the wood is very soft indeed. Usually the force to create the hole wears off the er.... the bit the screwdriver goes into. I almost always use a pilot drill first, unless I'm in a hurry, then I curse the bloody screws when they burr.

Not easily. Even catching a cold drains your energy.

Which isn't pleasant, and not all cancers.

ROTFPMSL! You shot yourself in the foot there. BillD is Rod Speed.

Cold vaccine anyone?

Stop repeating yourself Rod Speed.

That’s hair splitting given that smallpox has been eliminated from the wild. That’s a real cure.

Just how do you decide what is a ‘simple disease’ ?

No one gets what anymore ?

And by surgery.

It costs more to make it like that and doesn’t look as good with that bit sticking out of the nut.

Ordinance is stuff like artillery and so the maps were for them originally

We don’t have bone because it evolves too fast.

Works fine in sheet metal and in thicker metal if you get the hole size right.

Long time delay fuses (minutes to hours) have an anti tamper device that causes the bomb to go off immediately if you try to unscrew it.

Probably because they were originally derived from artillery range maps or drawn by the people who made that kind of map.

Depth of the hole or not wanting extra screw length on the back side?