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Rigid positive master mold is now done; compare this to the 3D model shown earlier. Next, a relatively hard but flexible polyaddition RTV silicone molding rubber (ACC M242, 42 Shore A) is poured into the mold and left to cure to produce a negative (or multiple negatives).
Getting this part right actually took three attempts on top of the earlier screw diameter typo, due to a bad behavior of the CAM program. The software - supposedly sampling the part and fitting toolpaths with a 0.001 mm resolution - failed to realize it should drive a 0.4 mm end mill to the very end of a region with a generous 0.41 mm allowance. This resulted in an imperceptible (0.2 mm or so missing) but significant flaw in gear tooth geometry that made the mechanism noisy and inefficient. Troubleshooting something you can't even see is hard - and indeed, it took a lot of poking, prodding, and manual toolpath analysis over the course of two days to figure out what went wrong.
The number of bugs and design issues that I stumbled upon in various CAM programs in the past two years nears 25 or so; and I run into them only when I am too lazy to run a simulation and examine it under a magnifying glass ;-)
This was for a family-oriented article about adults improving children's behavior. (why do all of my men have beards?)
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I thought he was really good in the second half, every carry made a difference. “We were very composed at half time, B...
This is not a client... This is actually my wife... I just found out last week that she is pregnant; and I'll be a father for the first time... :-)
Congratulations to me! LOL!
Positive Creations mural by Chris Dyer in the railroad underpass at Chicago Avenue and Lessing Street in the River West area of Chicago, Illinois.
hey little buddy....
not in the mood to shoot today and besides it's raining outside so I can't go out but not until I saw the result of my wife pregnancy test...
our newest family member, welcome to our family little boy (we hope)
Nassim Nicholas Taleb argues that as we face accelerating change and ever less predictable futures, we should orchestrate our lives to try to capture the upside of positive surprises…
unlike the banks, that lost it all thinking they could contain their exposure to negative surprises…
Taleb: “The payoff of a human venture is, in general, inversely proportional to what it is expected to be.
Contrary to social-science wisdom, almost no discovery, no technologies of note, came from design and planning—they were just Black Swans.
The reason free markets work is because they allow people to be lucky, thanks to aggressive trail and error, not by giving rewards or incentives for skill. The strategy is, then, to tinker as much as possible and try to collect as many Black Swan opportunities as you can.”
Taken in 1995 using positive slide film and a canon EOS Elan. The image was digitized using a Canon R5 in 2025, 30 years later.
A slot canyon is a long, narrow channel or drainageway with sheer rock walls that are typically eroded into either sandstone or other sedimentary rock. When the sun is high it throws light down in to the narrow-walled canyon illuminating the sandstone in to bright red, yellow, and purple colors. The beams of light are further exaggerated by people above the canyon, throwing sand down to the floor.
Back in 1995, these canyons were lightly visited
Image - Copyright 2025 Alan Vernon
May 3: It looks like we're about six weeks into another project that will keep us busy for about 19 years.
The "next phase" of the project should start around the end of December. Too bad we already used the name Noella. Although who knows, maybe it will be a Noel? Or a Holly?
June 13:
I had my 12 week check-up today. I'm having the same morning sickness I had with Noella, although it is not limited to the morning; in fact, I probably feel at my best in the morning. I feel sick everyday, although I don't get sick everyday. I've done it enough by now though, that Noella has taken to pretending to be sick in the bathtub "just like mumma", (although she doesn't say it in those exact words), she'll cough loudly into the tub and then turn to me with a big smile and say "coughing. Noella. Mumma". Paul is on diaper duty whenever possible.
As with Noella, the doctor couldn't find her heartbeat this morning, so we had to go right over to the hospital for an ultrasound. But, we weren't as panicked this time around. They were able to get the heartbeat, and all seems to be well. We got an early peek at the baby....he/she already looks pretty much like a little human, kicking legs and arms all over.
Our "official" due date is December 26. Noella was 10 days late......
Seemoos, Lake Constance
300 seconds exposure @ ISO 1,5
Camera: Harman TiTAN 4x5
Lightmeter: Sekonic L-508
Paper: Harman Direct Positive Paper FB Glossy
Developer: Tetenal Eukobrom (rotation development)
Stop Bath: Ilfostop
Fixer: Ilford Rapid Fixer
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To help inspire positive thinking and provide the motivation needed to reach huge success, Pinnacle Promotions...
27th May 2012. Sinar F 4x5 camera. Schneider Repro Claron 135mm f/8 lens at f/8 on Kentmere VC select (RC multigrade) paper, 1/2s.
Direct positive (reversal) process. Scanned directly, and tones corrected in the GIMP to look as close to final print as possible (i.e. there should be no artifacts from scanning/digitising). The yellow/blue duo-tone is how it comes out.