Ok, I have a workbench plan in metric. I've gone thru all of the
to inch conversions and wanted to ask those who have done this
what happens here.
For instance, one my measurement is for 90 x 45 x 700 which
converts to (roughly) 3.54 x 1.7 x 27.5 = I have a feeling that
this is close enough to standard 2 x 4 = 3.5 x 1.5 - the 27.5, is
really depended upon how long I need this piece and might
be subject to other components.
However, I've got one at this: 70 x 70 x 810 which equals 2.75 x 2.75 x 31.8.
Should I make this 2.5 or 2 3/4 or 3 inches? Again, I recognize
that it could change depending upon the other pieces, but for the
purpose of buying lumber, do I just get something I can plane
down to below 3 or AT 3 inches?
Experiences shared appreciated.
On Jul 5, 5:54 pm, email@example.com wrote:
Is this a dressy bench or a work bench? If it's a dressy bench and
you want to show off the wood, then you should buy thicker stock,
joint it and plane it to thickness. If it's work bench you could
built it up from dressed stock and make minor adjustments so you
wouldn't have to do the milling operations 2 @ 5/4 stock + 1 @ 1x
stock puts your right around the 2.75. Making it from built up stock
also provides "instant" tenons and mortises by having the middle piece
project to form a tenon or having a void to form a mortise.
A large part of the world has gone metric in the last 50yrs but it hasn't
been a simple process. The international timber trade for instance remains
Imperial and so even in Europe we are often working in metricised imperial.
This means for instance that we buy sheet materials in a standard size of
1220 x 2440mm which turns out to be an 8' x 4' sheet. The thickness of the
sheet however is metric, precisely sanded to 6, 12, 18, or 25mm -
increments of six millimeters, except they aren't because they are metric
equivalents of 1/4, 1/2, 3/4, ad 1". And that doesn't apply to certain thin
materials which are sold as say 3.2mm thick but which are actually 1/8".
Confused? You will be.
As for your plans, the dimensions are clearly metricised inches in that 70mm
is 3" planed in a metric planing machine to a metric 2 3/4" (What we call a
nominal 3"). 45mm again is 2" sawn timber planed both sides to finish at
45mm. So by all means convert to inches again but there are two pitfalls to
1. Check three times that things 'add up'. eg 12mm (1/2") plus 12mm(1/2")
makes 24mm which is not as much as an inch or even 25mm which is a metric
2. Never add or subtract a mixture of the two systems. A millimeter less
than an inch is a dimension on no rule which cannot even be expressed as a
decimal or fraction of either system.
If you go for a beer in a bar in France you always ask for a 'demi' which
means a 'half' and the barman gives you 250cl, a quarter litre.Why? Because
it is a metric half pint, despite the metric system being standard for
200yrs in France beer is still drunk in pints which aren't Imperial Pints
but metric equivalents, and not for that matter anything to do with American
pints which are something else again.
And a pint's a pound the world around...
Another reason customary units (some Imperial,
some SI, some American, some others) is that
they were determined by custom to be convenient
for particular applications. Stress analysis is simpler
with force-based units as you don't have to divide or
multiply by the acceleration due to gravity. Pascals
are way too small to be practical, for most uses,
it takes several hundred thousand of them just to
blow up a party balloon. If you have to stick a 'k'
'M' or 'm' in front of the unit most of time you use
it, it's the wrong size to begin with.
As I mentioned before, when I was a kid in Holland, a "pond" was the
same as 1/2 kilo, 500 ram, not the 453 or so grams a pound weighs.
Moreover, an "ons" (pronounced almost the same as an ounce) always was
100 grams, not the 28 or so a "real" ounce is.
Hmmm, here in NZ which has been metric for 50 years or so,
sheets also come in 1200x2400, (very few in 1220x2440) and
additionally to your imperian fractions in 7mm, 9mm, 15mm and
16mm and 20mm thick, depending on material.
An interesting thought. 250cl is a very large glass of beer.
2.5 litres. Gosh. Those French sure can put it away. Just a bit
more than 4 pints, by the way.
A standard glass of Beer in Germany used to be "A Half" ( of a
litre) being 500ml. For people with less capacity, or thirst,
you could get "A Small" (1/4 litre). Except the beer industry
wanted to raise prices, but didn't dare do that, so they
shipped smaller glasses and the sizes became 400ml (or 40cl)
and 200ml (or 20cl) respectively.
I expect the French demi will refer to 1/2 a standard beer,
rather than half a pint, the latter would be closer to 300ml
firstname dot lastname at gmail fullstop com
And often when you buy 1/2" plywood you'll actually get 15/23"' buy 3/4"
and you might get 11/16", etc. etc.
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Spruce ply and other sheeting types plywood's and other rough construction
sticks (2x4s etc) are imperial thicknesses, Fir ply and hardwood veneer ply
is in metric thicknesses.
Only 3 countries left in the world still on the imperial system, Libya,
Burma, USA. Come on! Get with the program. Why convert? Buy a metric tape
and a couple of steel rules.
Stuff that comes in 23rds is a bear to work with.
I know. my bad... just a typo..
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