Welcome to the Newschoolers forums! You may read the forums as a guest, however you must be a registered member to post. Register to become a member today!
They are not easier or better becose of fractions, I could have 10,125cm and just 10 1/8 cm. Had a project this year, we had to build a small prototype and imperial was realy usefull to have something between the principal metric mesures. 1 inch = 2,54cm. 1/2 = 1.27cm. 3/8 = 0,95cm. 1/4=0,64cm. 1/8=0,32cm. So for exemple if I'm looking for a bearing of 0,9cm diameter and i don't have 100$ to get custum buy bearings and the standard metric bearings diameters are every 0,2cm (0.6cm, 0.8cm, 1.0cm, etc), then the best for me is a 3/8 imperial size bearing. Worked with metric and impertial during the whole project and it's not realy hard, inch is little more the 2,5cm, 3/8 is little less then 1cm, 1/8 is 3 mm. But yeah it can be annoying, teacher said one of NASA satelite they sended on mars crashed becose of some metric/imperial conversion mistakes... nice way to lose 5 billion dollars.
Think about ski lengths, they're all in cm's, and nobody shits the bed. You probably know pretty much how long 181cms is.
As for the 1/2 cup analogy, metric cups are quite common, and neatly measure a 1/4 litre. The US cup? That gets a litte confusing. Are you referring to a 1/2pint? Or the legal US cup, which is 8.12 fluid (US) ounces or 8.45 (UK) fluid ounces (but acutally defined as 240ml). (I LOVE WIKIPEDIA)
I think people who work in metric use fractions, but maybe not as much. As soon as you move into the 32nd's, most people get lost anyway. Quick, is 11/32's bigger or smaller than 3/8's!?
As for construction, imperial is easier because the material is sold in imperial units. Boardfeet etc. Its mostly habit. Consider that a 2x8 is actually a 1.5x7.25, and that often the "units" are really just "names" to identify standard sizes.
The one US measurement I like is tap sizes, because they tell you turns/inch and the number of threads. But metric taps are nice too, the M3, M4, M5 system, distinguished with Coarse and fine.
this.
I believe the only issue impeding us would be the cost of converting it all over to metric. It would be in the billions.