[ARC5] Cost of sets - 1950 and 2010

[J. Forster]

I don't have time to check right now, but I think there are at least three
"standard" pitches for some metric bolts.  IMO, it's a zoo.

-John

===============


> On 24 Sep 2010 at 12:53, Leslie Smith wrote:
>
>>
>> > "As far as I can tell, there are STILL no universally standardized
>> metric threads and diameters."
>>
>> You aren't serious?
>
> Quite.
>
> Come to the U.S. and take a close look at metric threads in use
> here. It has been a nightmare for the auto industry, among others.
> Furthermore, since the U.S. imports everything now, the plethora
> of DIFFERENT metric threads has compounded the problem.
>
> Possibly in Oz that has never been a problem, but it sure as heck
> has been here!!!!!!
>
> When I mentioned the Italian rapier with metric diameter and
> turns-per-inch, I was not kidding: I was speaking from experience.
>
> Also, as mentioned here, the Japanese version of metric totally
> fouls up their circuit boards as far as "standard" is concerned.
>
> I did not say that metric measurements were not far more logical
> and much easier to use than English/Imperial: what I said was
> that the latter have been actually, really, truly standardized for at
> least two centuries (I had forgotten that the 20th century is past),
> while, in the present world, due mainly to the European equivalent
> of "not invented here" metric threads have not been standardized
> yet.
>
> Oz might be different...
>
> As another example, I have never heard of "metric coarse", and
> although I am a VERY amateur machinist, I have had SOME
> experience in dealing with metric threads!!
>
> Ken Gordon W7EKB
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