[ARC5] A flame against the imperial system - (was cost of sets)

[Leslie Smith]

Hello mike:

I can't answer your question.  I'm astonished to believe that a machine shop would set up to produce a screw that size, since it's not metric.  I have an older friend who knows a good deal more on this subject than I do.  I'll ask Bruce.


Les


> ----- Original Message -----
> From: mstangelo at comcast.net
> To: "Discussion of AN/ARC-5 military radio equipment." <arc5 at mailman.qth.net>
> Subject: Re: [ARC5] A flame against the imperial system - (was cost of sets)
> Date: Fri, 24 Sep 2010 13:06:23 +0000 (UTC)
> 
> 
> 
> I wouldn't blame the Japanese for odd component and connector 
> dimensions. Many popular electronic components were designed in the 
> US and the package dimenstions were specified in inches. That's why 
> the common dip package pin spacing is 1/10 of and inch (2.54mm).
> 
> I found the best way of learning the metric system was to 
> understand it without refering to the Imperial system. For example, 
> a teacher would display a meter stick and claim 'this is a meter 
> stick, a tenth is a decimeter, one hundreth is a centimeter" and so 
> on. Saying a meter is 39.39 inches just confuses people.
> 
> I do, however, have one question about the Japanese adaption of the 
> metric system. A common metric small screw size is M2.5. Many 
> Japanese radios use M2.6 screws. Why did they adopt that size since 
> it was so close to M2.5?
> 
> Mike N2MS
> 
> ----- Original Message -----
> From: Leslie Smith <vk2bcu at operamail.com>
> To: Discussion of AN/ARC-5 military radio equipment. <arc5 at mailman.qth.net>
> Sent: Fri, 24 Sep 2010 11:52:32 -0000 (UTC)
> Subject: [ARC5] A flame against the imperial system - (was cost of sets)
> 
> <snip>
> 
> The ONE place where I prefer metrication is in PCB layout.  A pin 
> spacing of 0.1 inches is a LOT more useful than 2.50mm, especially 
> when it's a many element connector.  The Japs have bastardised the 
> PCB system.
> 
> Enough.  Best wishes from the theoretically metric Australia.
> 
> Les
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