Friday, February 13, 2026

My Fingers Are Grateful

I bought a parting tool for the lathe.  This is a very sharp thin blade that mounts on the cross-slide for cutting off pieces of the victim at precise locations. 

In the past, if i need to cut a small amount off of a tube, I had to either hold the tube closer to the blade than I preferred or if the amount was small enough, use the lathe to slowly plane off a few thousandths of an inch, again and again.

In this case, I needed to remove 1.85" from the PVC tube.  It was so elegant. 

Why I Think The World-Shattering Nature of AI is Hype

This is not the first time a new technology has appeared with the fear that existing workers will soon be unemployed in vast numbers.  Remember that in 1790, 98%+ of Americans worked on farms. Yet we do not have a 98% unemployment rate.

The development of machine tools and other elements of the Industrial Revolution did not cause mass unemployment. Instead, there was something called "de-skilling." What had been highly skilled craftsmen were replaced by lesser skilled operatives using mills, lathes, and similar tools to mass produce identical parts that other lesser skilled workers assembled into clocks, guns, then eventually cars, aircraft, and houses. All these less skilled workers were paid far better than their craftsmen predecessors because the highly efficient factories were so profitable that employers could afford to pay high wages to attract workers.

How many Americans in 1790 owned a click or a watch.  Far fewer than today.  None could own modern marvels such as cars, revolvers, semiautomatic rifles, or dishwashers. Yes, none of those existed in 1790. That is my point. Each step forward created unimaginable wealth and creativity that allowed for new technologies and jobs to go with them. 

There are jobs that AI will destroy, the equivalent of individual flintlock rifle makers. Such makers continue to work into the mid-1800s. What they did was obsolete but they soldiered on and retired. I doubt many young men in 1840 looked for a chance to apprentice to one of these old-fashioned craftsmen,'who retired or died.

More Evidence AI Is Mostly Hype

2/10/26 Ars Technica:

Alphabet has lined up banks to sell a rare 100-year bond, stepping up a borrowing spree by Big Tech companies racing to fund their vast investments in AI this year.

As others have observed, few companies from 1926 have survived 100 years without completely evaporating (e.g., Texaco) or defaulting on their bonds (GM).  How many tech companies of 2000 are anything like their former importance?  A few. Many others are either gone or of such limited importance as to be unrealistic payers of bond interest.

For You Materials Science Nerds

 Why 304 stainless steel is less corrosion resistant than you may assume:


And if, like me, you have ever wondered what distinguishes 304 from 18/8 stainless steel.


Thursday, February 12, 2026

It Is Still in Need of Some Editing and Paint Touch-Up, But It Works


That is a 25mm eyepiece in it, not what I will use in it for the wide angle, high brightness finder.  
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The tube needs to be shortened another inch to get more infocus distance for the helical focuser to go between extension tube and eyepiece. Then a little touch up paint on the PVC. I am pleased with the optical quality of what was a $15 objective lens. This has not received much of a test; chromatic aberration is more of an issue as magnification and brightness go up 

With the 25mm eyepiece, I get 6x, 7.5 degree field of view. The exit pupil is 10mm so roughly 75% of the light gathering capacity is lost going into a 5mm human pupil.  That is still more than three magnitude deeper into the sky than the naked eye.  I have no stars available for testing but used outdoors, the image is noticeably brighter than naked eye.

A couple possible choices of eyepiece for finder. The Svbony 25mm Plossl is cheap. It would give me 6x, but the Plossl design has a slightly wider apparent field of view, so i would get 8.2 degrees of sky. The Svbony 40mm Plossl would get me 3.8x and more than 10 degrees of sky. AstroMania 40mm is a bit wider so 12 degrees of sky. I am not sure that the extra field of view is really necessary and lower magnification means giving away light 

Cutting Off Oil to Cuba

Are they not on board with reducing greenhouse gases?

Wednesday, February 11, 2026

What AI Is Good For

Define the problem.

For a 6" diameter 6061 aluminum disc supported at three edges with a 20 pound weight at center how thick should it be?

After showing how it calculated it. Grok said 0.04" then said triple that to avoid any problems with the various ways to interpret support positions. This is really quite a bit thinner than I expected. I had planned on 1/8" thick for CFC.