SAE to metric conversion?

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Rob Frankhamr
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Re: SAE to metric conversion?

Postby Rob Frankhamr » Tue Dec 29, 2020 6:02 pm


Good old Uncle Clive... I started out with his 'build it yourself' Hi Fi system, then it was the black calculator followed by the white scientific one and the 'Black Watch' My first computer was a ZX81 before veering off into Memotech and PCs. Now, for fun, I sometimes run a ZX81 emulation on a PC... trying to remember the keystrokes is great fun...

Rob
I bet you wish you still had the "black watch", unless you haven't seen what they fetch nowadays. Did yours actually work? I believe most didn't. The only Sinclair I built from a kit was the Micromatic radio. Most of Sinclair's designs were actually very good, technically - often ingeniously so. Then usually let down by cheapest-sourced components, cheap, flimsy cases and cost-cutting on things like heatsinks. The ZX81's "slow-mode" performance can be boosted by about 15% by adding one transistor and a couple of resistors that the bean-counters removed. Mine has a sensibly-sized heatsink fitted on the regulator and (so far) the over-utilised ULA chip has held out too.

EDIT: just popped into my head that electronic stuff tends to be based on imperial sizes (e.g. 0.1" pin spacings on DIL chips)
Nah, it's metric... 2.54 mm... in any case, you're cheating... using a metric division of an imperial unit. Should be one tenth of an inch. :grin:

Yes, the black watch did work for a bit but it went through batteries like they were going out of fashion and eventually, the buttons stopped - well - buttoning.

Rob
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Rob Frankhamr
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Re: SAE to metric conversion?

Postby Rob Frankhamr » Tue Dec 29, 2020 6:03 pm


Good old Uncle Clive... I started out with his 'build it yourself' Hi Fi system, then it was the black calculator followed by the white scientific one and the 'Black Watch' My first computer was a ZX81 before veering off into Memotech and PCs. Now, for fun, I sometimes run a ZX81 emulation on a PC... trying to remember the keystrokes is great fun...

Rob
I bet you wish you still had the "black watch", unless you haven't seen what they fetch nowadays. Did yours actually work? I believe most didn't. The only Sinclair I built from a kit was the Micromatic radio. Most of Sinclair's designs were actually very good, technically - often ingeniously so. Then usually let down by cheapest-sourced components, cheap, flimsy cases and cost-cutting on things like heatsinks. The ZX81's "slow-mode" performance can be boosted by about 15% by adding one transistor and a couple of resistors that the bean-counters removed. Mine has a sensibly-sized heatsink fitted on the regulator and (so far) the over-utilised ULA chip has held out too.

EDIT: just popped into my head that electronic stuff tends to be based on imperial sizes (e.g. 0.1" pin spacings on DIL chips)


Nah, it's metric... 2.54 mm... in any case, you're cheating... using a metric division of an imperial unit. Should be one tenth of an inch. :grin:

Yes, the black watch did work for a bit but it went through batteries like they were going out of fashion and eventually, the buttons stopped - well - buttoning.

Rob
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Frankhams retirement home for elderly Boxers.

Mjolinor
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Re: SAE to metric conversion?

Postby Mjolinor » Tue Dec 29, 2020 6:10 pm

I think there are more metric pin spacings than Imperial now. 1/10 is rarely used except for legacy stuff.

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Re: SAE to metric conversion?

Postby dacsceilings » Tue Dec 29, 2020 8:24 pm

Eeeee, they don't make nostalgia like they used to in my day

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Rob Frankhamr
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Re: SAE to metric conversion?

Postby Rob Frankhamr » Wed Dec 30, 2020 10:28 am

I think there are more metric pin spacings than Imperial now. 1/10 is rarely used except for legacy stuff.

I suspect that's a sign of the movement of electronic research and production to the Far East from the US...

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Re: SAE to metric conversion?

Postby Electrajohnt » Mon Jan 25, 2021 10:45 pm

Just been tracking down piston rings for a Matchless, they were sized in multiples of 3/64” for thickness. Good old Christian units, don’t want none of them heathen units now we are out.

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Re: SAE to metric conversion?

Postby windmill john » Tue Jan 26, 2021 8:54 am

3/64”... now is that in:

Whitworth
AF
BSP
UNC
BSW
BSP
Zzzzzzzzzzzzzzz :roll:

Give me metric :grin:

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Rob Frankhamr
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Re: SAE to metric conversion?

Postby Rob Frankhamr » Tue Jan 26, 2021 10:33 am

I wonder how many people born after - say - 1980 would be able to visual one sixtyfourth or work easily in fractions... let alone spell the words...

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Re: SAE to metric conversion?

Postby Mjolinor » Tue Jan 26, 2021 10:39 am

3/64”... now is that in:

Whitworth
AF
BSP
UNC
BSW
BSP
Zzzzzzzzzzzzzzz :roll:

Give me metric :grin:

I can almost hear Mjolinor running to his keyboard.
3/64 BSP, mon dieu, c'est impossible.

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windmill john
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Re: SAE to metric conversion?

Postby windmill john » Tue Jan 26, 2021 1:52 pm

I wonder how many people born after - say - 1980 would be able to visual one sixtyfourth or work easily in fractions... let alone spell the words...

Rob

I was born quite a bit before that, okay with factions, :grin: but can’t really recall using fractions or imperial since school; let’s ignore full miles and feet for a minute.
I don’t see 30mph as imperial, but I’d rather work in mph than kph, even though I know the main ones.

Of course the benefit of km is when touring aboard. When I see 200 km to blah blah, I see it as 200 miles... it comes down very quickly then!
http://www.kittos.co.uk
Best roads: 623 Burgos to Santander. A back road to Metz; can't remember which!
Tweety Pie, my F650GS
Ari, my 500 Classic
Gupta, my 350 Bullet.
Sold my Airheads, what an idiot.
Too many bikes have come and gone, trying to be sensible now!

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Re: SAE to metric conversion?

Postby Mjolinor » Tue Jan 26, 2021 2:59 pm

Of course the benefit of km is when touring aboard. When I see 200 km to blah blah, I see it as 200 miles... it comes down very quickly then!
Same here, I just love that about driving in Europe. :)

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Re: SAE to metric conversion?

Postby DEEP DIVER » Tue Jan 26, 2021 3:08 pm

I used both at work, I'd order steel strip 50mmx4mm in 10 ft lengths.
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Re: SAE to metric conversion?

Postby george baker » Tue Jan 26, 2021 10:16 pm

Hi
200 km to blah blah, I see it as 200 mile
I feel the same about litres and kg, but sometimes wonder why the steaks and beer fill me up so quickly -- must be the fresh air on holiday

George
Member 21, R100R, and an under used K75


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