1967 has always been my favorite year for American car style. Name a make & model, and chances are my favorite version of it will be the '67, from back when I was 9 years old. 🤓
My grade school's "playground" (the church parking lot) was adjacent to a major artery through town, leading to the bridge across the Mississippi. Every new model year, my buddies & I (and our dads) would check out all the new advance looks in the car mags, then before long we kids could watch the real deal, coming off the bridge on the big car carriers from points east, during recess out on the abrasive tarmac.
I thought the Mustang looked OK when it was introduced, but I still remember watching those beautiful new '67s going by on the trucks with that perfect new look - whew, love at first sight. We'd stand on the edge of the lot and whistle and cheer for the Mustangs and 'Cudas and Cougars, oh my! Sometimes the truckers would wave and honk.
I guess I feel a bit sad for kids these days. It's just not the same with new cars anymore. Or cars in general, I guess.
My grade school's "playground" (the church parking lot) was adjacent to a major artery through town, leading to the bridge across the Mississippi. Every new model year, my buddies & I (and our dads) would check out all the new advance looks in the car mags, then before long we kids could watch the real deal, coming off the bridge on the big car carriers from points east, during recess out on the abrasive tarmac.
I thought the Mustang looked OK when it was introduced, but I still remember watching those beautiful new '67s going by on the trucks with that perfect new look - whew, love at first sight. We'd stand on the edge of the lot and whistle and cheer for the Mustangs and 'Cudas and Cougars, oh my! Sometimes the truckers would wave and honk.
I guess I feel a bit sad for kids these days. It's just not the same with new cars anymore. Or cars in general, I guess.
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Through the evolution of this megathread Scott W has pointed us towards Richard Feynman's angelic perspective. A beautiful snippet:
Best to all for the upcoming challenging year,
Chris
Best to all for the upcoming challenging year,
Chris
An oldie goldie, stolen from a gas tank sticker on a Harley. Perfectly period correct for anything British or American, but embarrassing for my 1975 R90 airhead, which should have proper Teutonic reserve. We're all walking a line between death and diapers.
Or diapers and death. Cosmic , My Dude
Chris
Arf!
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Applies here, as I am home from the hospital recovering from covid.
Got sloppy and caught it.
Puts a new perspective and how many days you have left and what to do with them.
Stay safe and don't get sloppy guys.
Thanks Chris you made my morning !
Dennis, our wishes for full recovery.
Scott has to post since Sep 2021. Hope he is doing OK
George
I did wonder what Scott was up to. Assumed he was too busy with cooking and grand children to enter the swamp.
+1 for speedy recovery Dennis.
+1 for speedy recovery Dennis.
Thank you gentlemen for recovery wishes
(I am doing great)
Scott has not posted to ASR since September of 21 either
(I am doing great)
Scott has not posted to ASR since September of 21 either
Perhaps he has other issues.
https://www.jsonline.com/obituaries/mjs051077
Does look like he is still kicking and should be for a while.
https://www.jsonline.com/obituaries/mjs051077
Does look like he is still kicking and should be for a while.
Dennis: Glad to hear you are OK. I also had the pesky virus last month, was only really sick one day but that was Christmas Day. Of four people in our house four got covid over the holidays (well, one of the 4 brought it into the house).
Been following the launch and unfurling of the James Webb telescope and every so often having a 'how the hell have they done that' moment. Latest one came last night reading about the mirror adjustment. There are 144 actuators used to adjust the primary and secondary mirrors. All of them have to work for the telescope to work properly and they have to be able to position things to within a couple of nm whilst at -220C. Tribologists dream or nightmare?
https://www.esmats.eu/amspapers/pastpapers/pdfs/2006/warden.pdf interesting paper here talking about how it works. I'm seriously impressed they've got stepper motors to work in those conditions!
https://www.esmats.eu/amspapers/pastpapers/pdfs/2006/warden.pdf interesting paper here talking about how it works. I'm seriously impressed they've got stepper motors to work in those conditions!
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Indeed! "All bearings and gears are coated with a Ball proprietary dry film lube to enable operation at 30K." Metals sure love to contact-weld at vacuum...as anyone who has maintained vacuum metallizers can attest.
I'm not in the least surprised that steppers work in such balmy conditions, 55 Kelvin.. That's almost a warm summer day. The beauty of a stepper is the lack of brushes to fail in space. The choice over three phase brushless is most likely because the steppers do not need to be energized to maintain position where 3 phase ones usually do, and in vacuum you can't keep the coils on or they will overheat.
As for position resolution, 1 nanometer resolution absolute position linear encoders are off the shelf product, I'm using those for motion control of multi-ton objects..(the requirement was 1 micron accuracy, we settled with 5 nm). They even sell the optical scales in invar to prevent temperature dependence.
The bulk of the devices are either steel, aluminum, or neodymium, so the environmental temperature produces the biggest errors. Even a 1 degree C change causes expansion and contraction that far exceeds the 5 nm position repeatability. So that 5nm is really the encoder position accuracy..the mechanical engineers have to figure out how to minimize temperature dependence.
The most difficult aspect I see is getting all the electronics to operate at 55K, but that is common nowadays. Actually, having lots of experience with kapton films, I think the biggest problem is surviving a launch without ripping any of the films. Once kapton has a nick at the edge, it will easily tear under tension. I have no idea what pinhole defects in the film would do.
The best aspects of kapton is that it is the only plastic that still flexible at 4.5 Kelvin, and that stuff is huuugly radiation resistant.
John
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Yep, the 256K DRAM generation used kapton tape on top of the die, to shield it from alpha particles. But that was the last time an all-planar capacitor cell was used; now they're all 3D and much less sensitive to alpha strikes.
My work experience is in a very focussed and narrow regime.
However, I have three advantages over many....I watched every episode of "The repair shop" ( waiting with baited breath for the next season), and always look for "How it's made" episodes. Two of my favorite shows. And I stayed at a best western last night...
I think I helped design the manu process for the webb imaging arrays, soldering, TCE, matched expansion epoxies... not sure, the engineer I worked with retired, so I can't ask him if that was what it was for.. It might have been for some other project, not sure... Don't matter anyhoo..
John