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My concern... is we use one system or the other... and not mix them.
Remember a service van I had years ago... there was no telling whether a bolt or nut would be metric or SAE... until you put a socket on it and determined if the socket fit or was just a little loose. Literally one bolt of the engine accessories (belt driven things on the front of the engine) would be 13MM... the next 1/2".
So either way is good... just please do not mix them on the same product!!!
Ah yes, but it only applies to soldered copper, in which the most common sizes are 15mm, 22mm and 28mm. As soon as you start with threaded fittings or pipework, it is back to imperial, sink taps are 1/2" bath taps 3/4", and a threaded adapter will be quoted as 15mm to 1/2 inch, or 22mm to 3/4"etc!
I used to run a remodeling co... we specialized in basement finishes. Did the water with copper pipe...
Then switched to heating and AC... noticed the copper pipe is a different size, yet called the same.
We have done a little commercial refrigeration (convenience store stuff)... even rigid pipe (tubing?) for refrigeration is the smaller size noted in the previous post.
So does it match in thickness the current plywood...
Even in the USA... going from one manufacturer to another... could cause a difference of as much as a 1/16" in thickness... both are called 3/4 BCX at the big box stores.
Point to remember... always start and finish a project with the same brand of lumber...
Before you order 3/4 inch plywood and by golly it was 3/4 inch thick.
Now it is close to 3/4 but to some 32 of an inch.
When we built the shop it has second floor with 16 centers on the joists and we wanted more heavy duty and after much homework selected 1 1/8 plytanium subfloor as it was APA rated 48 span meaning it on 48 inch joists were same as normal on 16 so given we had 16 span good to go.
Ordered 2 pallets of them and there were noticeable differences in thickness and there was no way to reasonably sort and size them.
We just used a 20 inch floor polisher with sanding disks to level it out and called it a day.
When we looked into it the responses were that size varied due to international standards and metric along w the many other excuses for lack of quality control.
Next time you are at the big box store look at the sheet stock and everything is just a bit thinner than standard and it is same as the 1.75 quart ice cream instead of 1/2 gallon or smaller cans of product that cause cooks grief and metric gets blamed sometimes but we know it is about profit....
I got it the other way round yesterday.
Bought a one metre length of 150mm steel tube but when I measured it back home it was 152.
Where does this come from?
neither 150 nor 152 is 6" so it wasnt just a straight swap.
the metric system was introduced in australia before i was born and i grew up on a farm where we had a sawmill as well so i ended up learning both from a young age. to be honest both systems have their positives and negatives. for some things i prefer metric and for others imperial.
I'm British, grew up with feet and inches. Living in USA I had to do some research. USA has used feet and inches based on Meter and Kilogram since 1864 Act of Congress which means USA HAS used kilo's and meters for over 150 years without even knowing it. Prior to 1864 act, the only standardised measurement was for gold and silver (Troy ounce)
Australia went metric 14th Feb 1966 if I remember the annoying jingle they used correctly?
Also had various rhyme's, 'liter of water a pint and three quarter' (UK pint, 20 fl. oz.)
'Two and quarter pots of jam, weigh about a kilogram' This was on British TV in the early 70's, almost 50 yrs later, it's still stuck in my head
Judging by the amount of students I had while teaching, US Military has used metric system for years
Yeah, I've been there. Due to a committee of contributors, our product had fasteners to be cataloged before
production, and (after some grousing and grumbling) mostly got sorted out. Everything was metric,
except one inserts-in-sheet-metal, so we rationalized at the toolkit. Four metric Allen wrenches, two or three
hex wrenches, and (for the lonely inch screws) Phillips head driver. The hard part was, one
or two socket heads could just barely be seen, and took a 18" (half meter) extension shaft driver
if you didn't want to skin your knuckles. Other than that, the whole multikilobuck
gizmo only needed the tools you could fit in a shirtpocket.
Three of the fasteners had to be done 'cleverly' (I hate that, SOMEONE a few years from now
won't get it right), so I felt a little ... unclean... about the design, but at least there wasn't a
wrong-measure-system wrench issue.
When I was teen I worked construction during the summer. This was in Scotland in the late 60's, just as they were changing to the metric system. The new system worked fine and the change was surprisingly smooth. Except for all the rules of thumb. I was frequently told to cut a piece of wood to (say) 1478mm. Less 1/4".
i was trained on the inch (imperial) system as a machinist in 1977-79, never learned metric, never needed it,dont see me learning it in the last half of my life either..in 1969 NASA put Neil Armstrong on the moon and brought him safely back to earth using the INCH system!!! if it was good enough f NASA and Neil Armstrong its still good enough f me !!!!!!! another story, last machine shop i worked in we had a russian lathe ,big long one 3o"x10ft because it had a power feed on the compound,it had a coolant pipe outlet on the carrige, pipe stuck up about a ft and had a swivaling extention on it so u could put coolant pouring on just the right spot where u were cutting,anyway i was cleaning the back side of lathe ,slipped and grabed coolant pipe ,it snapped in two like a twig !!! looked closer at it and it was pot metal, full of holes and air bubbles !!! anyway i removed it all and found some typical american plumbing pipe 3/4 and it threaded into the russian carrige hole like it was made for it !!! worked great, no leaks.
The old imperial system was based on the human body, one foot, duh. The Japanese and the Russians, even the French, had their own versions. For building furniture it's still a better system. Houses have been 16" OC for almost 200 years. For machinery, it's silly. Say the shaft is 80mm ,a pretty standard machine size, so I can grab a bearing just using the bearing's last two numbers and the type. Machinery is international . If a machinist makes a new shaft, instead of simple 80mm, he has to convert it to ????. . Now don't tell me that's not silly.
When my son was going through his apprenticeship he had to study the whole metric thing, that included learning to read a metric micrometer, only problem was there wasn't a metric mic anywhere on the plant site so he could practice