CHOICE membership

Items for sale with "imperial" dimensions


#108

https://roadsafety.transport.nsw.gov.au/speeding/speedcameras/calibration_certification.html

It just says it is done in accordance with manufacturer’s recommended method and specifications. I suspect that while the level of accuracy won’t be down to mm/hr, the level of accuracy will be sufficient to prove one was doing the speed measured.

I also see that one can request the calibration certificates for the device in most jurisdictions.


#109

Over the last 50 years it seems to me that those who stick with imperial units are clearly not numerate - they don’t do any calculations in the unit they quote and probably were those who did poorly at school. They may as well revert to cubits and pecks. If you actually use the units then the correct descriptors are used e.g. who calculates in funds, shillings and pence any more? USA scientists all switched to SI 50 years ago so their papers are understood by the international community - you can communicate with them, but as NASA found to its great cost when a space craft crashed into Mars, some diehards get the units mixed. Consumers would be better protected with laws and regulations that mandated SI for all things.


#110

Here’s a couple of interesting videos relating to redefining the kilogram that have a good balance between scientific jargon and sock puppets.


#111

I concur with your frustration. I was a fourth grader struggling with fractions when the metric system was introduced and quickly decided it was an easier and more logical way to measure the world. That was confirmed in Form 4 when Mr Beltrame plied us with the SI metric system of units as our introduction to Applied Science. My dad’s Peugot never saw an imperial bolt, nor did the subsequent Mazda.
Never underestimate the power of culture and national pride in this argument. In our case of course in Australia we have none of our own - we defer to the United States of America today who took over from Britain in the 60’s. Both hold pride in their differing imperial systems and will never accede to that world dominating French rubbish no matter how easy or logical it is.
I keep to the metric standards in all things I construct, but find in the building trade some imperial cannot be avoided. Tradition seems to have a more tenacious hold there, supported by cheap Chinese imports designed for the American market. It is also a world where a 1/2 of this or a 1/4 of that measured by eye works well enough. She’l be right mate, no need for that fiddly measuring thing. Once CAD gets into the picture though the metric system comes back, even if in the form of “decimal inches”. :laughing:
One area of engineering where the imperial system has a stranglehold is electronics. Component dimensions particularly of the older leaded kind are invariably built on a 0.1 inch grid. That comes about through the history of PCB’s having arisen primarily through American and post-war Japanese engineering. The Europeans did try and metricate it but it never came to dominate in the market.
So lets keep pushing back against the less logical and inconsistent imperial system’s traditions but work with it where we must.


#112

There are still those amongst us who appear challenged by the decimal point. It can be as confusing as fractions and counting in 12’s? Reality is there are instances where we still need to accept or understand there are differences. Some everyday items still contain engineering that in imperial is a whole number or neat fraction, which needs to be represented in 5 digits as micrometers when converted!

Yes, an all SI world and single ISO standard would be wonderful.

Note
I was being enlightened when we went metric and decimal. My text books were a blend of SI and American imperial units! The rules of thumb and everyday trades all worked in imperial.

There are still remnants of those days all around us. I still need two sets of tools to cover metric and imperial dimensioned equipment. Some of which if made for the US market is still very much in the 1950’s.

Ford pattern wheel studs? Golf buggy wheel rims?


#113

Automotive wheel rims :rofl: