Posidrive or slotted screws for woodwork?

Are there any luddites in here still preferring the old fashioned slotted screws?
--
Bod

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Bod wrote:

Furniture restorers love em and will usually buy up old stock. The rest of us realise the poziheads are generally superior to use especially where they won't be seen.
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On 10/01/2016 16:11, Bob Minchin wrote:

Indeed.
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I would standardize all screws as PZ2s.
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Agreed.
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On 10/01/2016 16:14, ARW wrote:

Might be a bit harsh for mobile phone manufacturers :-)
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On 10/01/2016 16:14, ARW wrote:

I wouldn't, PZ3 is a good intermediary before you get to coach screws. And PZ1 has its place on smaller stuff.
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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?
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On 10/01/2016 17:37, Mr Macaw wrote:

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
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On 10/01/2016 17:45, Malcolm Race wrote:

And I am pretty sure most cars manage with about half a dozen. Typically 10, 13, and 15 rather than 11 and 14.
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On 10/01/16 17:51, newshound wrote:

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. 3BA wasn't that common, but it was a standard.
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,
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newshound scribbled

A recent version of the MotoGP works Ducati motorcycle was *designed* with every bolt size imaginable. It caused all kinds of problems as the mechanics had to have all sizes of spanners to hand when they worked on the bike and it's very difficult to spot the difference between similar sizes. Making changes during setup of the bikes during practice took twice as long as necessary. There was no "correct engineering solution" shown by the designers whatever.
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On 10/01/16 17:51, newshound wrote:

google 'rigger jigger' 10mm and 13mm standard in the rowing world.
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On Sun, 10 Jan 2016 19:58:37 +0000, DJC wrote:

10mm and 13mm are the "preferred" head sizes for "preferred" ISO thread sizes, so they're what _SHOULD_ be used by anybody.
M5 = 8mm M6 = 10mm M8 = 13mm
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On Sun, 10 Jan 2016 17:51:35 +0000, newshound wrote:

Good ol' Citroen. 11 and 14 everywhere, rather than 10, 13, 15. Still, at least they used nice standard 8mm M5s.
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Shame they never work.
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On 10/01/2016 20:08, Adrian wrote:

Is that a 2CV? The BX and Xantias were more boringly conventional.
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On Sun, 10 Jan 2016 21:09:10 +0000, Clive George wrote:

That kind of era. IIRC CXs and Gs were similar. I've not worked on Ds much.
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9,11,13, 16 and 18mm spanner sizes are all fairly uncommon on cars.
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Even the bloody wheel nuts weren't standard on my Peugeot. I thought all cars used 17mm?
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