On 4/3/2017 3:53 PM, The Natural Philosopher wrote:
> On 03/04/17 20:45, rickman wrote:
>> On 4/3/2017 3:39 PM, The Natural Philosopher wrote:
>>> On 03/04/17 19:15, rickman wrote:
>>>> I was born with English units here in the US.  I hate them.
>>>
>>> Good greif! What have they ever done to you then?
>>>
>>> I neither love them nor hate them. They are what they are. History that
>>> refuses to quite die, and I work in imperial and metric simultaneously.
>>>
>>> I know exactly how many mm an inch is and how many grams a pound is.
>>
>> How many cubic inches in a cubic yard?
>
> 36^3

So you can't figure that in your head easily?


>   How much does a cubic yard of
>> water weigh?
>
> Getting on for 3/4 of  ton. +- a bit

Is "getting on" a technical term?


>  How many teaspoons in a quarter cup?
>
> That's not imperial
>
> The short answer is 'depends on the cup

A pint's a pound the world around (unless you are Imperial).  So a pint
is 16 ounces, a cup is half that or 8 ounces.  A teaspoon is 3 to a
tablespoon which is two to an ounce and Bob's your uncle, a quarter cup
is 2 * 2 * 3 or a dozen teaspoons!  I thought you liked dozens?


> There sis no standard on 'cooking' measurements
> because there is no requirement for precision.

Total BS.


>> I'll take metric any day of the week!
>>
> Fine.
>
> So what is a spark plug gap in mm?

Ha!  Depends on the plug doesn't it?

The last holdout in electronics seems to be PCB trace measurements.  We
like simple numbers like 6/6 design rules for 0.006 inch trace and
space.  But we are getting into fractions of a thou these days.  I see
recommended BGA layouts with 2.5 thou traces (0.0635 mm), so for me it's
metric all the way down!  The only concern is that PCB fab houses often
express their design rules in English units which are a tiny skosh
larger than the rounded metric.  So 0.1 mm clearance is certainly close
enough to 4 mil (3.937007874016) that it should suffice in all cases,
but will be rejected by the automatic rule checking at a PCB house if
the rules are in English units.  It's time to give up English units.

--

Rick C

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