Posidrive or slotted screws for woodwork?

Because they don't look old?

I don't get pozidrive falling out. As long as the screwdriver is perpendicular, and you're applying a downward force on it. I guess torx are tougher, but I'd think you could put in more pozis a minute.

I don't understand Philips still existing at all. Pozidrive is basically Phillips.1.

Isn't that silver instead of gold colour?

Errr, I though galvanised stuff never rusted. Sacrificial protection and all that.

And if your driver isn't aligned, you only have to turn it a maximum of

As with everything, too many inbetweens. For example, why does a car need 5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20mm bolts? Why not just 5, 8, 11, 14, 17, 20?

No, what is subjective is whether you prefer the look of pozidrive or straight.

But pozi screws allow it to drop in when it aligns, so you just start turning gently until it drops in.

Straight wouldn't be so bad if the groove stopped before the edge of the screw. The main problem is the driver slides out the side.

The sme reason as why the Rolls Royce Meriln engine used a 3BA bolt in one situation - because it was the correct engineering solution

Malcolm

And I am pretty sure most cars manage with about half a dozen. Typically

You don't need that many numbers. Where do you draw the line? A 3.78294572138mm bolt?

Exactly.

I thought decent antique stuff had all the screws hidden anyway.

Having done a fair amount of design, frankly 'the correct engineering solution' is a load of twaddle. 99.7% of engineering is 'good enough' - not 'exactly right'

There is a huge pressure to reduce stock inventory as well. which is why having a special screw that is M 5.638 or somesuch might just happen in a space mission, but nowhere else not even a Merlin engine.

Most cars do NOT use a zillion different bolts either. probably no more than half a dozen in any given car..however the next manufacturer whose car you fix, has a completely different half dozen. His inventory is different,

A number of my old woodwork teachers who were "old school" cabinet makers insisted that slotted screws in close proximity to each other or on adjacent hinges had their slots aligned.

Richard

I thought everybody did that - I made all the screws in my wall sockets horizontal. Pozis don't matter so much.

To not do so is similar to having your furniture scattered randomly around the room instead of in line with the wall.

I attempted to change to Torx screws but found that I needed 3 different size bits, whereas with PZ a No2 fitted the whole range.

Almost everything that needs fixing to a wall includes Phillips screws. They drive me mad, first thing I do is to throw them away.