I was in grade school in the 1950’s. It was way back then at least as I can remember that there was a big deal made about using the metric system. It was as if the U.S. (English, S.A.,E, etc.) measuring system of feet and inches (and all the rest) was under attack by the Metric system used in Europe and/or the “rest” of the world. It was the world of science and some engineering that was promoting this new “cause”.
As a “kid” what did I know. But I did get the impression that the USA was not going to change without a fight. It was like a foreign invasion, The emphasis was how to CONVERT from one measurement to the other. Awful conversions factors are required and it really was a math test.
I always thought it was stupid and awkward to do the conversions. I think it just made teachers feel good to have something in a math application they could grade (measure) for accuracy. Hmmm… Are grades in metric or English? How do you convert? Ha!
So we grew up dealing with both systems in grade school and awkwardly converting. It was like we had to preserve our “native” language. In reality, the total metric system actually has a lot going for it, but don’t say that too loudly.
Later in my life many published papers and drawings, where measurement are used, would group both measurements together. Let’s see that’s about 2 inches (51mm). That’s still done today. Most everything in commerce has both systems used in marketing as we are in a world wide economy. A rather clumsy accommodation, not likely to change soon.
Measurements and math are a form of language. In the real world, a person fluent in several languages actually thinks in… Continue reading
My daughter is a professional photographer working for a large commercial corporation. Some of the studio cameras use lenses that mount on a lens board as you see here. That is not a real piece of board, but rather a cast aluminum plate. I think the idea is to make lens changes and adjustments easier.
On this one someone bought the lens board with a hole that was too small. Maybe they got a deal? You can always make a hole bigger right? Problem is most people do not know how to make the hole bigger. If they know, they probably don’t have the proper tool.
I was given another lens board with the hole being much larger than necessary. “Just make the small hole half way bigger than the large hole.” I was told. I love those accurate working dimensions. Ha!
It was dang close to being a 2 inch hole I suspected I needed. I bored the small one out to about 1.995 inches. I was actually thinking 2 inch but short is better than taking too much.
My daughter took the lens board to work and sure enough the hole was still too small. “It needs just a hair more, Dad!” was her request. Uh… “What color hair, kinky, curly or straight?” I went for red, curly.
In the pix I went out to 2.010, so I’ll see if I got the color right…
OK, OK… I have kept this to myself for far too long.
There are lots of wonderful micro machine shop sites on the internet. One of them at the top of my list is called Micro-Machine Shop. Duh? I guess that’s not too hard to remember…
The old site URL was http://www.finelinehair.com/home/index.htm. That’s gone away. I didn’t know what fine line hair meant; I assumed it could be something to do with ultra precise measurement. Alan is a stickler for that, as a machinist should. I shortened the URL and it (he) is linked from a large hair products salon.
Yep, the creator of the site is named Alan. I haven’t found his surname yet (I did. Pinkus), but it may be buried in there somewhere. Maybe he just likes to be more private than myself. No matter, Alan publishes a wonderful site for us machine tool addicts.
Somehow I think Alan has more tools and variations and measuring devices than actually exist in the world. Just take any major supply catalog like J&L, Enco, etc. and order one of each on every page. He must own both companies. In any case, he doesn’t have a big investment in full size machines (hence the name “micro-machine shop”) but there is no shortage of accessories.
Many getting started machinist ask me what machines are best for the money they have. You will see here it is not the machines that require the most money; it is what you add to them. Alan has far more money and time than I can ever hope to invest.
Did I mention his photography is nothing less than extreme topnotch? Alan does in pictures what I do in words. In other words, about 1000 time more.
This is a… Continue reading