Uh, no… they lashed out because she sucks. You made the wrong choice for a new singer by trying to make a DEI hire and now you’re coping.

Linkin Park's Mike Shinoda on Emily Armstrong fan backlash

nypost.com/2025/07/21/entertai…

in reply to Scott D Hansen

@scottdhansen I don’t know… she may be some people’s cup o’ tea, but not mine. I think she blows. I don’t know what Mike Shinoda was thinking. It’s like when Van Halen was thinking of hiring Patty Smythe of Scandal as the replacement for Roth. Think about how that would have gone over. Just not a good choice.

If Shinoda wanted to continue making music, he should have just “formed” a new band so as not to tarnish the LP body of work.

Barack Obama Now Squarely in Russiagate Crosshairs

Barack #Obama entered national politics with a smile that looked like Hope and Change. Amid rumors of family discord and disarray within the political party he once led, his face has hardened. He lately looks bitter, resentful, exhausted by the act.

In the wake of reports released by fellow Hawaiian and former Democrat Tulsi #Gabbard, he also has a new problem. It once seemed a lock that Obama would be remembered as the winsome hero of Shepard Fairey’s portrait, but Gabbard’s documents place him at the center of an unprecedented act of political sabotage, committed in his last Oval Office days as a humiliated lame-duck in the winter of 2016-2017. The new Director of National Intelligence is targeting Obama’s legacy and maybe even his freedom, detailing a “treasonous #conspiracy committed by officials at the highest level of our government,” announcing that everyone involved “must be investigated and prosecuted to the fullest extent of the law.”

Ten days ago, news broke that Donald #Trump’s Justice Department opened criminal investigations into two of Obama’s top deputies, former #FBI chief James #Comey and former #CIA head John #Brennan. Last Sunday, Gabbard’s ODNI hosted an “urgent” meeting to discuss “new information on Russiagate” with members of the Justice Department and the President’s Intelligence Advisory Board.

All week, Washington buzzed with rumors about imminent document releases, but what came out wasn’t what many expected. Gabbard’s documents show the Obama White House overruling months of reports downplaying Russian interference and ordering subordinates to set a time bomb of manipulated intelligence, with the aim of trying to, as Gabbard described it, “usurp” an incoming president. No longer a tertiary character, Obama is now “center square” in the #Russiagate scam, as one source put it.

Mainstream press outlets like the New York Times and Politico have already run pieces quoting Democratic Party mouthpieces shrugging off Gabbard’s reports as “baseless” and an attempt to “change the subject,” but coverage may not matter, as the investigation into the Trump-Russia hoax is no longer about trying to change hearts and minds. Multiple sources say Gabbard’s team is focused on “accountability” by gathering evidence for court-ready cases. The matter may soon need a special prosecutor, putting Obama in the same position Trump occupied in the first two years of his presidency, on the run from a high-profile fox hunt.

The information from Gabbard’s office was not the only news on the Russiagate front. This investigation is not just about “ten-year-old news,” as has been a common talking point, but may also involve never-reported Biden-era issues. A source close to the investigation said yesterday that the DOJ is focusing on conspiracy charges and looking at conduct “from 2016 to 2024.” Another with ties to the administration said “President Trump’s national security team is looking at evidence that members of his 2024 campaign were spied on as well.”

All of that is yet to be determined. Until then, here’s a detailed review of what yesterday’s releases say, and why they signal a shift toward former president Obama:

Gabbard’s office put out two files. One is a 114-page document titled, “Declassified evidence of Obama administration’s conspiracy to subvert Trump’s 2016 victory and presidency.” The other is an 11-page press release that highlights the same documents, in a timeline with commentary. Gabbard compressed the releases further in an email chain replete with flow charts:

The documents focus on emails to and from the office of then-Director of National Intelligence James Clapper, whose name was conspicuously absent when news about criminal investigations into other Obama-era intelligence chiefs broke. Clapper throughout the Trump-Russia affair has been more publicly reserved than Comey or especially Brennan, who in 2019 excitedly suggested Special Counsel Robert Mueller might deliver indictments on the “Ides of March.” In contrast, Clapper told Chuck Todd on Meet The Press at the outset of Russiagate mania that “we had no evidence of collusion” when he left office in January 2017:

Clapper even before Trump’s election argued against making broad claims about Russian interference, let alone interference on behalf of Donald Trump specifically. The first email in the release is from Clapper, and describes a meeting chaired by former Obama National Security Council chief Denis McDonough:

Yes; at the WH session today chaired by Denis, I brought up that I had asked my team to produce an NIE on cyber threats to our electoral infrastructure… this generated quite a bit of discussion.

That Clapper called for an NIE or National Intelligence Assessment on cyber threats — a large, formal report comprising input from the entire intelligence community — is significant because other chiefs like Brennan urged a smaller ICA or Intelligence Community Assessment, a more informal document involving as few as three or four agencies. There is little chance unsubstantiated information from ex-spy Christopher Steele could have made it into an NIE. An ICA was a different matter.

The next documents in the chain show that not only Clapper’s office but others, including the FBI, were relatively unconcerned about Russian interference. Figures like Virginia Senator and key Russiagate figure Mark Warner are already dismissing Gabbard’s report as an attempt to “cook the books” by comparing “apples and oranges,” the apples being Russian efforts to attack “election infrastructure,” the oranges being “influence” operations. But emails dating back to September 2016 show a dismissive attitude toward both concepts, as well as a lack of conviction about Russia’s ability to impact or “disrupt” the election outcome in any way.

On September 5th, for instance, an FBI official asked for a change in the draft of a potential ICA on cyber threats, writing:

The way it currently reads, it would indicate that we have definitive information that Russia does intend to disrupt our elections and we are uncomfortable making that assessment at this point.

An official from an unnamed agency added:

I sort of understood the emphasis to be on Russia probably not having the capability to influence the election.

A DHS official wrote, “Russia probably is not (and will not) trying to influence the election by using cyber means to manipulate computer-enabled election infrastructure,” which might fall under Warner’s “apples” heading. That same official however added:

We assess that foreign adversaries, notably Russia, are more likely to focus their cyber operations on undermining credibility/public confidence… That assessment feeds directly into the influence operations, some cyber-enabled, that we’ve seen related to current and historic election cycles.

An official from Clapper’s ODNI hit the same note, suggesting that any influence operations would fit a normal historical pattern of “less sophisticated” propaganda:

Russia probably is not trying to going to be able to? influence the election by using cyber means to manipulate computer-enabled election infrastructure. Russia probably is using cyber means primarily to influence the election by stealing campaign party data and leaking select items, and it is also using public propaganda. This fits an historical pattern of Russia using less sophisticated propaganda and information operations to influence US elections.

By December 7th, 2016, Clapper’s office prepared text for a Presidential Daily Briefing headed ACTIVITY ON AND SINCE ELECTION DAY and reading:

By the next day, December 8th, officials had text prepared that read, “Russian and criminal actors did not impact recent US election results by conducting malicious cyber activities against election infrastructure.”

This wording was scheduled to be entered into the PDB — not a public report, but a confidential briefing to President Obama — the next day, December 9th. However, Comey’s FBI on the afternoon of the 8th unexpectedly withdrew from the PDB.

“FBI will be drafting a dissent this afternoon,” a Bureau official wrote at 3:48 p.m. “Please remove our seal and annotations of co-authorship.” About an hour later, at 4:53 p.m., an official from Clapper’s office axed the PDB for the time being. “Based on some new guidance, we are going to push back publication of the PDB,” the official wrote. “It will not run tomorrow and is not likely to run until next week.”

At that point, a meeting of Obama’s National Security Principals Committee was held. The list of attendees reads like an all-star collection of MSNBC green room visitors: John #Kerry, Victoria #Nuland, John #Brennan, Avril #Haines, Ben #Rhodes, and Andrew "McCabe, among others. One source told me to note the name Richard #Ledgett from the National Security Agency, who “played a role in this”:

This is the group that the next day received a group email from Clapper’s office headed “POTUS Tasking on Russia Election Meddling,” asking them to “produce an assessment per the President’s request,” with a target release date of January 9th, 2017:

The IC is prepared to produce an assessment per the President’s request, that pulls together the information we have on the tools Moscow used and the actions it took to influence the 2016 election, an explanation of why Moscow directed these activities, and how Moscow’s approach has changed over time, going back to 2008 and 2012 as reference points.

In sum, just before Obama was to receive a briefing that contained no reference to significant Russian interference, the briefing was called off and a high-level meeting of White House security officials was convened, after which Obama himself tasked them with a new assessment that would lean toward a more aggressive conclusion. Although this new effort was to be directed by Clapper’s office, the critical job of divining #Russia’s motives would be given to the CIA and Brennan:

ii. Why did Moscow direct these activities? What have the Russians hoped to accomplish? (CIA lead)

It’s suspicious that a Presidential Daily Briefing was postponed to make way for ICA ordered at Obama’s request, fishier yet that the evidence that Putin intended to help Trump came from a classified annex containing Steele dossier material, but the smoking gun is that these eventual conclusions leaked instantly — not one or two weeks after Obama ordered the ICA, but the same day, before any group work could possibly have been done.

On December 9th, 2016, the New York Times ran “Russian Hackers Acted to Aid Trump in Election, U.S. Says.” This piece not only led with the full-blown Steele Dossier saw about Putin having acted to help Trump at Hillary Clinton’s expense, it followed with aggressive conclusions about Russian hacks of both Democratic and Republican party infrastructure. Also that day, the Washington Post ran a piece describing a “secret assessment” that Russia had worked to help Trump, even though the group assessment had only just been assigned.

It's hard to square all of these instantaneous leaks with Obama’s alleged insistence that the ICA investigation be conducted “by the book,” as Obama’s National Security Adviser Susan Rice eventually documented in a letter to herself. Former CBS reporter Catherine Herridge, who reported on the letter, noted that Rice’s letter to herself takes on “new significance” in light of Gabbard’s documents.

On December 10, 2016, the Post ran another piece quoting senior intelligence officials claiming to be worried about their futures, noting the coming report could potentially pit “the entire U.S. intelligence community against a newly sworn-in president who has repeatedly denigrated their work.” Added another: “After Jan. 20… we’re in uncharted territory.” Remember at this point there’d been no evidence whatsoever linking Trump to Russia or even suggesting Russia sought to help Trump, apart from the bogus Steele material.

After that, leaks followed in rapid succession, on almost a daily basis. On Dec. 11, 2016, the Times ran “C.I.A. Judgment on Russia Built on Swell of Evidence,” claiming the “stunning new judgment” they’d just reported came from the CIA, but “does not appear to be the product of specific new intelligence obtained since the election.” Instead, “it was an analysis of what many believe is overwhelming circumstantial evidence — evidence that others feel does not support firm judgments — that the Russians put a thumb on the scale for Mr. Trump, and got their desired outcome.” The “stunning judgement” wasn’t based on new information, but a change in the political weather at the top of the administration allowing more aggressive “analysis.”

From there, officials built the Trump-Russia narrative brick by brick. On December 15th, the NSA’s Admiral Michael Rogers, who in private refused to upgrade his agency’s confidence level from “moderate” to “high,” told the Times there “shouldn’t be any doubt… This was a conscious effort by a nation-state to attempt to achieve a specific effect.” News that the FBI agreed ran the next day.

This is the process that led to the release of the much-discussed January 6th, 2017 Intelligence Community Assessment that concluded “[Vladimir] Putin and the Russian Government aspired to help President-elect Trump’s election chances when possible by discrediting Secretary Clinton.” When the report came out, via a pre-conceived format that involved a public document and private classified annexes, news of what was in the classified part leaked quickly.

The first outlet to break the big news was CNN, which reported on January 10th, 2017 that President-elect Trump had been presented “a two-page synopsis that was appended to a report on Russian interference in the 2016 election” that included claims from a “former British intelligence operative” that allegations that Russians “claim to have compromising personal and financial information about Mr. Trump.” The Times quickly followed, noting the “author of the memos is Christopher Steele, a former British intelligence officer with MI-6, who once served in Moscow,” and “Former C.I.A. officials described him as an expert on Russia who is well respected in the spy world.”

Some of this timeline was known, but the sudden ditching of a tepid PDB and ordering of a new report “per the President’s request,” with emails conspicuously invoking “POTUS tasking,” never surfaced before. There is a reason many of the news reports about Gabbard’s releases have Obama’s name in the headline, along with the term “treasonous conspiracy.” The former president’s role in directing the reworked ICA is clearly a focus of Gabbard’s team.

Also new is testimony from a whistleblower in Clapper’s office, who was asked to sign off on the claims about Russian intent without being shown the alleged intelligence supporting the claims. “As for the 2017 ICA’s judgement of a decisive Russian preference for then-candidate Donald Trump,” he told Gabbard’s group, “I could not concur in good conscience based on information available, and my professional analytic judgement.” That whistleblower’s 2019 efforts to obtain documents relevant to the Steele material by Freedom of Information Request are also in the new package.

Not everyone in Trumpworld is thrilled with the new developments. The failure of senior intelligence officials who served in Trump’s last term to find and/or release these documents has a number of high profile figures upset. “So much corruption,” said one disgusted former Trump official. Another expressed skepticism that anything of significance would come of these investigations, and pointed to Special Counsel John Durham’s ill-fated probe: “It’s always something.” Thanks to the investigation kicked off by this ICA and the subsequent probe by Special Counsel Robert Mueller, there are people who went to jail, fell ill, went through family crises, and dealt with other serious problems. As a result, there are a lot of eyes on this investigation, and high expectations. Failure for Gabbard’s team to deliver real consequences would bring heavy criticism from both sides.

Gabbard’s team seems to understand they will be judged on the “accountability” question, and remain determined to continue. More releases are expected.

--M. #Taibbi

50 years of China-EU ties: Upcoming summit highlights China’s key role in shaping Europe’s future tehrantimes.com/news/515900/50…

more questions about yt-dlp arguments on debian (excluding av1, aborting an active download not shutting the terminal down)


debian 12.11, yt-dlp stable@2025.07.21

aim: to download the best video available with the largest height but no better than 1080p, excluding av1 as well.

What works:

yt-dlp -f bv*[ext=mp4]+ba[ext=m4a]/b[ext=mp4] -S height:1080 --all-subs


but this command downloads, if possible, av1, which target hardware doesn't support for longer than 5 minutes.

Argument I don't know to add correctly:

[vcodec!*=av01]


I tried:

yt-dlp -f bv[ext=mp4]+ba[ext=m4a]/b[ext=mp4][vcodec!=av01] -S height:1080 --all-subs


and other variations, but it didn't work.

second question, aborting an active download not shutting the terminal down: neither ctrl+c nor ctrl+q work and opening htop to kill the process seems overkill. What I now do is to simply shut the active tab, but there must be a faster way.

This entry was edited (1 month ago)

Still, politicians, media, and profiting corporations in the West remain silent or worse still support a genocidal regime that is out of control. Enough.

theguardian.com/world/live/202…

Like an audit?
thegatewaypundit.com/2025/07/t…

Russian Forces Press Multi-Front Offensive: Ukraine’s Defenses Stretched to Breaking Point southfront.press/russian-force…

Hi Fedi, Software and Electronic engineer looking for work here :blobwave: :boost_ok:

I'm looking for work in Berlin, or Germany, or remote. I'm especially experienced in programming language/compiler front end design, and working with DSLs, as well as all the usual backend and database skills in high level languages. I can also do basic frontend work. I'm also especially passionate about electronic engineering, with a degree in the subject and a lot of hobby work, especially around low-EMI board layout and design for manufacture.

If this sounds like an opening you know of, or even if it doesn't quite fit but you think you have an interesting opening, feel free to message me!

#fedihire #getfedihired

in reply to 💙🩷💜Ⓑⓡⓔⓣⓣ🐡🍉🐧

@brettm it’s pretty different. with CGI the web server runs a program, sets env vars for it, pipes the request body into it, sends its stdout as the response, then the program’s life is over. with FastCGI a similar protocol is simulated, but the web server doesn’t run programs, it instead talks with a persistent FastCGI application server over a socket and goes like “hey server new request here is env vars here is stdin run the thingy and gimme stdout” and the fcgi server acts like it runs a program as requested and sends its stdout. The “Fast” of FastCGI is obtained from the fact that the fcgi server doesn’t actually need to exec a real executable and can be specialized for an application’s needs; php-fpm for example doesn’t need to run the php interpreter from scratch and parse and compile the php code every time, it can instead initialize it once and cache the compiled bytecode across requests, saving time

Some web servers like nginx support FastCGI but not CGI; it shouldn’t be difficult to make a fastcgi server that translates it to normal cgi, but having to run a fcgi server in addition to the web server might be a slight inconvenience

Yeah, let's give an American company access to loads of government data and pay them a load of money to run the government for us using software that systematically fabricates false information and has nasty racial biases. That'll surely stimulate the UK economy.

bbc.co.uk/news/articles/czdv68…

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everybody watch How Wings Are Attached to the Backs of Angels it's so beautiful
youtube.com/watch?v=NRHVzbJVx8…
This entry was edited (5 months ago)

A nuclear blast isn't the end. It's a test.
For discipline. For knowledge. For inner strength.
Panic kills faster than radiation.

What matters most:

Bright flash? Don’t look. Drop down. Cover your ears and mouth.

30 seconds — shockwave hits. It fears concrete.

First 10 minutes — survival window. Find shelter fast.

72 hours — critical radiation. Stay underground.

Iodine. Airtight seals. Air filters. Not heroism — calculation.

The bunker isn’t a refuge.
It’s a tool.
You are its operator.
Continue in my telegram channel:
t.me/gavart10

#SurvivalWisdom #NuclearProtection #BunkerLife #FalloutReady #ColdWarKnowledge #DeepShelter #NewWorldOrder #CrisisManual

Antiwar News with Dave DeCamp, 07/22/25: US-Alled Nations Condemn Israel's Killing of Civilians, Israel Buys Humvees With US Aid, and More youtube.com/watch?v=kUjApmLMzp…

Sulfuric Acid Attack, Propeller Tampering Reported ahead of Gaza Flotilla Launch #Palestine palestinechronicle.com/sulfuri…

Part_of You reshared this.

The file converter you’ll love is called Vert. All image, audio, and document processing is done on your device. Videos are converted on our lightning-fast servers. No file size limit, no ads, and completely open source. vert.sh/

12:42 Palestinian sources: Death toll from yesterday's aid seekers massacre in Al-Sudaniya, northwest Gaza, rises to 99 english.masirahtv.net/news/371…

Part_of You reshared this.

in reply to merompetehla

I think AVC1 is another word for H.264. That's the oldest one with lots of hardware acceleration available in old devices and by far the biggest one in file size. VP9 should roughly be on a similar level with H.265. The main difference is that VP9 is supposed to be royalty-free and H.265 isn't. The best one is of course AV1. But that also takes considerably more resources to encode and decode.
This entry was edited (1 month ago)

Ted Galen Carpenter: NATO’s Proxy War against Russia Becomes Increasingly Reckless original.antiwar.com/Ted_Galen…

Prédateur sexuel

Sensitive content

kolektiva.social/@igd_news/114…

""Scott says one of the most notable finds was an [Atlanta Police Foundation] letter lobbying the Atlanta City Council to stop a public referendum campaign, which sought to cancel the facility’s ground lease through a citywide vote."wabe.org/atlanta-community-pre…"

Nombreux articles sur Gaza, ce matin dans Le Monde. Si vous n’êtes pas abonné, ça peut valoir le coup d’acheter Le Monde papier de l’aprèm.

Et puis, il y a cet article sur le tourisme d’Israéliens à la longue-vue : À Sderot, chaque jour, des Israéliens viennent contempler, d’un promontoire transformé en mémorial du 7-Octobre, la guerre qui ravage l’enclave palestinienne. « C’est le meilleur spectacle en ville ! »

“Not all Israelis” sûrement, et ceux de Sderot ont souvent des proches victimes du 7 octobre, mais ça fait mal.

lemonde.fr/international/artic…

#Gaza #Sderot

"If they keep their promises, by the end of 2025, Meta, Amazon, Microsoft, Google and Tesla will have spent over $560 billion in capital expenditures on #AI in the last two years, all to make around $35 billion."

Just imagine if all that money were invested in making their businesses carbon neutral.

wheresyoured.at/the-haters-gui…

We have made the decision to not continue paying for BBB accreditation

Link: mycherrytree.com/blogs/news/wh…
Discussion: news.ycombinator.com/item?id=4…

I feel obliged to be very clear. I am not a luddite. I’m not anti-technology. In any case it would be a losing battle. I can see a lot of areas in which #AI has an important place and where it could make our lives much, much better.

The fact that it is being applied in areas that rob us of our voices, of our creative expression, of the need to build skill to attain the proficiency that engenders pride….

Wow. How fucking self-hating is that?

This entry was edited (1 month ago)

What the UK needs are *mass protests* with hundreds of thousands of people holding those “I OPPOSE GENOCIDE – I SUPPORT PALESTINE ACTION” signs.

They can arrest 50.

They can arrest 100.

They cannot arrest 100,000.

They cannot arrest a million.

#Palestine #PalestineAction #FreePalestine #UK #protest #israel #genocide #ethnicCleansing #apartheid #settlerColonialism #StopIsrael #StopArmingIsrael #StopTheGenocide #YourGovernmentHasFailed #powerToThePeople

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Please understand that I say this with the utmost sincerity: Go fuck yourself you genocidal piece of shit. People are being starved to death and being murdered with bullets while lining up for food while being starved to death and this is what you have to say, you utter piece of human trash? Assholes like you without a thread of human decency are the reason human suffering is allowed to exist. You make me sick. mastodon.social/@dodo1095zd/11…
in reply to Aral Balkan

Palestinian - pol

Sensitive content

in reply to Aral Balkan

He knows this line works on our racists. IMO we should still know how to refute it.

Thousands of non-combatants were held in Israeli torture facilities such as Sde Teiman. Their imprisonment was unlawful and a greater injustice. So Hamas took innocents, but Israel took many more. To demand one-sidedly they let go of their bargaining chip, shows Israel are again forcing their racism on the Palestinians, and that they kill random non-combatants when even some of them don't submit to it.

in reply to Aral Balkan

I just blocked and reported this (German) guy who argued the same way:

"Palestinians are starting war after war since 80 years and are constantly loosing the wars they started. Maybe, since they 'keep running against a wall' since 80 years, they should just accept what Israel 'offers' them. Also, it's their own fault if they're genocided, since they won't release the hostages."

social.tchncs.de/@AdeptVeritat…

Sheffield activists blockade arms factory
freedomnews.org.uk/2025/07/22/…

"Forged Solutions produce parts for Israeli F-35 fighter jets ~ Cristina Sykes ~ Sheffield group Stop Arming Israel says its activists early this morning (22 July) blockaded weapons parts manufacturer Forged Solutions in the Meadowhall industrial area. They plan to remain until 10am and expect this to result in the factory being shut down for
The post Sheffield activists

This is an interesting project.

I think I would switch to a simple laser pointer with perhaps a pinhole in front of it to narrow the beam, and I would make the eye stationary and move the laser instead.

This has the additional benefit of measuring angle, which makes it equivalent to an autocollimator - but it's actually better because it becomes more precise the further you place the eye from the emitter.

He says it has a 3 micron pixel size, and if we just assume that's the resolution, then putting the sensor 2 meters from the emitter will give you 1/3 of 1 arc-second graduation. Putting it 4 meters away will give 1/6th of an arc-second. Putting it behind a rifle scope or telescope would result in an insane amount of angular precision, more than you can ever hope to actually make a part to.

youtube.com/watch?v=hnHjrz_inQ…

in reply to Caleb James DeLisle

It strikes me that you can make very high quality surfaces using only a low fidelity CNC router and a high precision flatness measuring technique.

What you do first is modify the CNC router so that it is able to spring on the Z axis, so that Z position in fact corresponds to downforce.

Then you need to derive a surface height map, and put that into an algorithm which can output a polishing tool path. The correct amount of downforce and time for removing a specific number of microns must be determined, for the tool, grit, and material.

But with that information known, you can put the map of high spots into a tool path plotting algorithm and it should give you a tool path that is believed will knock down the high spots.

Assuming the algorithm does actually remove the high spots and doesn't just make the problem worse, you can zero in on the goal by switching to more and more gentle polishing tools.

When you're down to nanometer scale diamond grit on a fuzzy pad making a mirror finish, you've basically gone as far as you can go.

You probably need to build a small random-orbital tool for the router because simple rotation does not do the right thing.

in reply to Caleb James DeLisle

The real limitation on laser angle measurement is dynamic range. If you put a 10x scope in front of a camera with a 5mm wide optical receiver, that's the equivalent of now having an 0.5mm wide optical receiver. But you only need 1 meter of distance for better than 1/10th of 1 arc-second graduations, which is very good.

Arc-seconds are small, about 5 microns per meter. If you had a mile long wrench and you pushed the far end of it by about 3/8ths of an inch, that will rotate the bolt 1 arc-second.

To aid in alignment, there can be a cover over the aperture with a hole the size and shape of the aperture itself, so that if the laser is missing the target, it is obvious whether it's missing left, right, high, or low.

Also 1/2 mm is a really small aperture, so you would think the laser also needs to be a 1/2 mm beam, but that's not how lenses work. The lens takes every ray of light with the same *angle* and directs it to the same point on the receiver, so the laser only needs to emit *parallel* light rays, it doesn't need to emit a point. Industrial lasers with adjustable focus are like 5$ online.

Putting a cover over the lens will still work because the lens tells the camera sensor exactly what *angle* the light comes from even if it's only catching 10% of it. In addition, it can help keep stray light out of the camera, and avoid the laser light from washing it out.

Minor errors in focus are a blessing in disguise because they spread the light over more pixels which gives you more confidence when you solve for the where is the center of the light.

In order to establish that a surface is flat, you need 2 optical receivers at a right angle from each other. In theory you could setup one and then move it, but it's not worth it to not be able to come back to your measurements because you dislocated the receiver.

To realistically set something up for measurement, the receivers need to be able to be adjusted up and down, but this does not require precision in any way, and it's just meant to bring them close enough that the laser hits the aperture, then they can be locked in place.

The measurement process would begin by leveling up the workpiece by eye, then verifying that the X receiver can pick up the laser at the 4 corners of the work - or at least 3 of them (in case of a very high corner). Then, without moving the part, you adjust the Y receiver until it can pick up the 4, or at least 3 corners that the X can pick up. Then you just start working over the part, collecting points and angular deviation which can be resolved into a height map.

Putting a "normal" camera above the workspace can help because then the computer can know where on the work you measured when you got a specific measurement, no need to manually record the results...

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mastodon - Link to source

Frikisada

@proyectouna hay algún texto sencillo en castellano sobre el tema? Tuve unos amigos de visita el otro día, en una librería vimos un libro, Fascist Yoga, y una amiga y yo vimos muy clara la relación pero el otro del grupo no, y la verdad es que no supimos explicar mucho más allá de que las soluciones individualistas acaban ahí, pero me gustaría poder mandarle algo (perdón si me estoy entrometiendo pero sabéis ambas muchas cosas)