Yay! A conversion that doesn't cut off the resolution to something
useless! I was looking at wire grommets (for desks and the like) today,
and they stated 50mm/2". They were 50mm, but that means the fit will be
sloppy if you drill for 2". Either give me a reasonably precise
conversion or don't give me one at all.
Some countries have banned the use of imperial units in their
metrificiation efforts, which is why you get moronic stuff like this.
Rule of thumb: If there's no decimal points in a dual-system dimension,
one of the measurements is wrong.
Where would you find a situation where you would want to subtract a 1mm
firn a kilometer or 1/16 from a mile?
Even with GPS you can not measure a kilometer to that degree of
accuracy. The last time I checked GPS was accurate to about 100 feet.
Au contraire...at least w/ a little help... :)
Field guidance systems are 1-sigma absolute accuracy of about 4.5 cm. In
other words, can locate within 4.5 cm of a specific point 65% of the
time, and to under 10 cm around 95% of the time (2-sigma). Relative as
opposed to absolute accuracy is about 2.5 cm.
With the current self-guiding systems, absolute accuracy is now down to
about 2 cm, and relative accuracy in the millimeters.
Of course, this is done in firmware in the receiver using multiple
inputs, not a single satellite as used in the run-of-the-mill auto GPS
systems (altho I thought they were closer to 10-ft now rather than 100?).
Since they turned off the "selective availabilty" (or whatever
they called it - the intentional error that the US military
insisted be inserted into the GPS signal for non-military
uses) 10 feet (or 3000mm) would be about right for horizontal
measurement. GPS it quite a bit less accurate vertically
without special processing.
Reliably resolving below 10 ft without using differential (or
"relative") techniques is still a bit of a problem.
On 8/6/2016 5:13 PM, firstname.lastname@example.org wrote:
And I seriously believe this is the king of answer you get when dealing
with metric measurements.
Fortunately with Imperial feet and inches and fraction of an inch IMHO
make things a bit easier to visualize, sorta. Especially when dealing
with measurements for building a room or home.
I think "afraid" is erroneous; "stubborn" and "independent" is more
accurate I believe.
While a trained engineer and thus very conversant with and comfortable
using metric units, I am also one who is comfortable with the status quo
of imperial units in every-day life and would not welcome change. It's
comfortable to have things like the temperature and windspeed innately
relate to what one is used to as opposed to having to convert from some
differently-scaled unit that just "don't seem right!" 20 degrees
outdoor air temperature is (and should always be) cold, thank you very
much! :) OTOH, that that same air is at STP in some computation
involving it is also ok; they're just two different locales and keeping
them in their own context is far more natural.
Pressure is another; in the power industry, "balance of plant"
calculations around the reactor core were/are typically imperial. 2250
psia and ~650F saturation temperature for primary coolant has real
context as well; it just isn't natural in metric. OTOH, inside the core
for nuclear cross-sections and all, metric units are de rigueur.
Manufacturing can (and has) converted almost entirely other than for the
issues addressed elsethread of the fact that so much was done before the
need to convert and that it still isn't cost-effective to actually make
the hard, physical change (else't they'd have done so on their own, no
government mandate needed if economics is left to drive the decision).
In the US in general public, there's a very strong tradition of
independence and resistance against be forced into any position (albeit
with the aim by the progressives of weakening that as much as possible).
This is a very significant point, and is why in the UK so many
things are still sold in the odd size of 453g (otherwise known
as 1 pound). If your whole plant is tooled to use 1 pound
boxes or tins, it's simpler just to change the marking from
1lb to 453g than it is to change the plant to make 500g or 1kg
True, but it works against us at times. We want to buy cheap stuff from
Asian countries then bitch because it is metric. The little
manufacturing we have left wants to sell to other countries then bitch
because they don't buy our products because they are not metric.
It is not always about being forced, it is about being sensible to
Used to buy from a local hydraulics shop when we had older US made
machines. Starting in 1989 we added metric. When we needed something
for them, the guys at the shop said "if its metric, you're on your own".
They went out of business keeping strong traditions.
That's also a type of forcing but it's more nearly free will as being
your choice to continue to play in the game as opposed to being told by
a central government that as of tomorrow all road signs (say) will be in
km, not miles...that, as we've seen, did _not_ succeed in US owing
mostly I think to the above general tendency of American psyche being
resistive of direct edict.
Any manufacturing that is exporting anything with compatibility issues
has already converted and I posit the hydraulic shop of which you speak
wouldn't have lasted for other reasons besides simply non-SAE hose
fittings as there are a seemingly unlimited number of those. A link
There's a couple of other factors that come into play on
that particular example.
One is that, someone who's grown up with a given system
developes facility at estimating in that system, so US
drivers can estimate distances in miles, and not in km,
and so naturally resisted the more "difficult" system.
The other is the random coincidence that highway speed
works out to roughly 60mph (this was particularly true
when they tried metric roads, since the double-nickle was
in effect). Since our time system works on an increment
of 60, that's mile-a-minute, and you can easily figure
how long it'll take to get somewhere. 100kph doesn't
work out that way.
Fortunately, no-one has seriously suggested metric time.
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