Re: metric DIL packages

From: HÁRSFALVI Levente <>
Date: Mon, 02 Jun 2014 17:39:54 +0200
Message-ID: <>

On 2014-06-02 17:16, Marko Mäkelä wrote:
> After all, it is 0.04mm per pin, not 0.4mm. Only 19*0.04mm off for a
> 40-pin socket, and this one was smaller, right? Maybe you would notice
> the 0.76mm difference for a 40-pin socket and chip.

0.4 mm is the approximate worst-case misalignment (~0.76/2) of the four
outward pins if one aligns the chip cleverly ie. to the middle of the

> Maybe the ignorant could just dismiss the difference as Soviet
> tolerances :) Rumour has it that Russia redefined the railway gauge,
> extending the track width by 3mm, because it was cheaper than rebuilding
> all tracks after the collapse of the Soviet Union.

Wikipedia has an interesting article about the Russian rail gauge
(haven't known, for example, that Finland uses a broad gauge of similar
inheritance). They indeed mention a redefinition of the gauge size from
1524mm (5ft) to 1520mm starting from the '60s.


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Received on 2014-06-02 16:05:12

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