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Notice that all the screws in a mechanical wristwatch are slotted. There is a reason for this.
The original Phillips driver was designed for building aluminum aircraft. It was designed to cam out before the material being screwed into was damaged. Later cross-drive screws, e.g., frearson, were mostly not designed to cam out.
As others have said, with cross-drive screw heads the bit is self-centering. It isn't with slotted screw heads, but the slot is easily restored. If you ruin a cross drive head you need a screw extractor.
My main thought is that for every other type of screw, you need EXACTLY the correct size of screwdriver. So, for a general life, you need 6-8 sizes of Phillips, 8-10 of Torx, 4-6 of Robertson, but you can by with about three flat blade screwdrivers (small, medium, large). Specifically, in electronics, NO, I can think of no reason for a standard screw.
I find Robertson (square head) screws work best. You can put them on the driver and they stay there. Wonderful for drywalling. They are common in Canada, but do not seem to be used much in the USA. (Correct me if I am wrong).
In part, the Robertson screw didn't catch on in the US because after lengthy negotiations Henry Ford refused to license it for his cars.
Re sizes of slotted screws: A pro is that slotted screw heads can be turned with almost anything, such as coins, knife blades, putty knives, tin can lids, and so on. The corresponding con is that non-commercial users rarely have a screw bit that actually fits the screw they are trying to turn.
Moreover, the sides of the blade are often tapered, rather than parallel planes, with the thought that the bit can be wedged into a range of slot widths. But as a consequence of the wedge shape, the bit tends to cam out.
Pro screwdrivers are sold that have exactly the right tip width for, say, the standard slot on #6 wood screws, and have parallel sides. A pleasure to use.
If you can tell me how to do that with a Phillips or a slotted screw driver, I am very much interested
Of course you can't. No doubt Robertson screws are great. However, all modern designs share the same doesn't-fall-off property, even the old Allen, with the added advantage that instead of four possible insertion angles, you get six, eight, or even twelve.
If there hadn't been further advances in screw drive since P.L. Robertson, his design would be in common use everywhere. But even recently, Torx II is a big improvement over Torx.
Correction, as requested:
You have "square head" but Robertson is NOT square it is tapered. If you continued the lines of the corners you would have an elongated pyramid shape. That taper is their essence and why they are so effective in holding a screw and not chattering.
Personally I've never heard it called standard head. In the US, every where I go, it always referred to as "flat-head". So I will call it as that. There are two situation where I choose the screws.
1. Metal work, the screws mostly comes in with flat-head (slot as you put it), Phillip, or torx. My preferences are Torx, phillips then flat because on metal all holes are predrilled.
2. Wood work, the screws come in many types. My preferences are: Star, Square or Phillip. Torx is very rare for wood. I will not use flat-head screws. I will reluctantly use Phillips if I can't find squares or stars.
Aside from the crews themselves and for other purposes then what it was originally designed for, the flat-head screw driver is the most useful tool among all other types of screw driver.
If this is true, I may just have to subscribe to BritBox or something
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