3.57/25.4*64 = 8.99528... or, going backwards,
9/64*25.4 = 3.57187500...
It's just some idiot converting their original design documents from
imperial to write them in metric to make them "acceptable" for the EU
rules to be able to export product w/o having duplicate documentation.
It's much cheaper to reprint the datasheets and leave the product
unchanged than retool to the nominal nearest whole mm so they do the
former rather than the latter.
Likewise the 4.37 mm is 11/64" -- 11/64*25.4 = 4.365625000...
(Although I'm sure you knew this, "just venting"...)
And I suppose there's probably some EU regulation that requires them to
be precise to some level such that rounding to 4 is outside of allowable
tolerances as if 1/64" is going to make a hill of beans in the screw
location; you'll be lucky to keep it within that owing to grain unless
it's a fully automated production system that pays no attention to such
niceties by being full CNC-controlled or the like in a production
facility. By hand, it's in the noise...
Or, if may just be as noted first, just gave the job to some flunky to
compute the numbers and plug 'em in and nobody ever gave it a thought as
to whether it made any sense or not...you can see the same insanity in
the spec's for almost everything that is an existing product or made to
match up in building trades to the common use of feet-inches in layout
such as the 16" OC stud spacing leads to 4x8 ply and then the nominal
thicknesses for it and on and on and on. It'd one-up the Caterpillar in
Wonderland for riddles...
That's because they were made to Imperial dimensions which were then converted to
metric. Hardware made to metric dimensions isn't like that.
LIke I said... made to Imperial dimensions.
No, of course not. But 4.37 mm is 11/64", 3.57 mm is just about exactly 9/64" -- and both are
the result of some idiot making something in Imperial dimensions, then converting the
dimensions to metric.
Why didn't they just make it metric in the first place??
And while that sounds like a reasonable explanations there are some
metric standard measurements on the slides that are a common metric
standard. These slides are designed to be used with the 35mm system and
does have some dimensions in whole mm's. But then there is a
measurement that is 4.6mm (.18in.)
Maybe they got converted back and forth so many times common
measurements of either have become skewed because of rounding.
Yes but 4.6mm converts to .18" that is a little less than 3/16"
I think it was made to one standard and probably converted back and
forth too many times with the previous results.
3.57mm = 9/64". Such odd numbers show up because the original design of the
hardware was done in imperial not metric. If you are using truly metric
hardware you will find nice numbers like 5mm a lot but never a fraction in
Actually 3.57mm rounds down to 9/64. If you want the accuracy to be
that fine of resolution why not use easier to measure units. 1/8" would
have been fine instead of 9/64" If the hole spacing/placement needs to
be that fine they should specify what size screw to use in the hole also
as a smaller screw will allow movement. But hole spacing is not "that"
critical in this instance.
As already mentioned, that is a bastardized imperial translation. I've
been working with metric machines using metric tooling to make usually
metric dimensioned parts. It is rare to ever see a decimal and it is
always .5 on some small items.
Many people here bitch about having to use metric, but on the occasion
we give Imperial measurements of parts for tooling made in China, they
have no problem translating. Once you use it for a couple of week it is
really easy. You never have to wonder if you need a 23/64 or 3/8 wrench.
The strange thing about oil companies is that in most of their
international operations, drilling is in metres but in the US it is in
feet. The situation in South America is weird. Although the countries
have long been metric, they still drill in feet.
So are you saying that the metric system is like not being able to use
all of the letters of the alphabet to spell all of the words? LOL
I realize that metric is just as easy to use as imperial but I can see
how there can be some confusion if you are measuring a large difference
in values. It seems to me that if all resolutions of metric
measurements did not all have the suffix that they would be easier to
Working with Festool tools you learn quickly to measure and convert
between metric and imperial. There I said it, Festool! Get your points
while they are hot! LOL ;~)
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