j4k3
@j4k3@lemmy.world
- Comment on What brings you peace in your life? 1 day ago:
gas lighting, the effulgence of a burning future.
- Comment on If there is a doctor that only saves killers, and a killer only kills other killers, I wonder who would save/kill more people? 2 days ago:
military hospital doc versus special forces… Doc’s more effective.
- Comment on Oi mates, I'm back. 2 days ago:
Gold of the gods. We are all spaceships for the microbes.
- Comment on Discord delays global age verification rollout after backlash - Dexerto 3 days ago:
Is fluxer as network f’ed up as Discord without the minimum democratic standard of human readable domains, or is it the slavery of dozens of undocumented raw IP addresses?
- Submitted 4 days ago to 3dprinting@lemmy.world | 1 comment
- Comment on Sometimes I wonder if my older brother and I both were in grave danger, who would my parents save first... 🤔 4 days ago:
Who would you want them to save first?
- Comment on Nevermind the drink I'm holding 5 days ago:
My ex wife. Bitch
- Comment on Cup cake 5 days ago:
- Comment on Why do I look like shit some days? 1 week ago:
Becoming a roadie and riding a bike everywhere for years fixed me feeling like this. I had to get over all of my insecurities being in public in a cycling kit. Being around other people riding and racing, it became my normal. Now… I don’t have to look at me, so why the fuck should I care what anyone thinks. They are used to it or whatever, who cares. I’m more interested in inferring their real intelligence versus narcissistic stupidity based on their responses. Old people are all ugly. “For your age” is just an excuse for it. The vanity is boring. People who are judgmental are just projecting their own inadequacy and internal misery.
- Comment on What books have a lot of useful information should I get? (I mean like a Wikipedia thing with vast knowledge, but non-electronic.) 1 week ago:
Chemistry, math, physics, optics, metallurgy… The thing that is hard is how your needs for knowledge will change over time and what is accessible to you at each stage.
For general electronics, The Art of Electronics is the goto book. For actually understanding practical stuff, you need to build a knowledge of the industrial revolution and how it evolved. The inventions of James Watt opened up steam. The Bessemer process scaled iron. Large heavy castings drove the potential for large lathes, but lathes are the key to everything. A lathe is capable of cutting a more precise screw than the one used to operate it. That old screw can be replaced with the new, until you achieve your desired precision.
A reference flat is made using two granite stones rubbed together with water in between until the top one creates suction that can lift the other.
Prussian blue and hand scraping are used to make machine flat surfaces.
Automotive suspension components like springs and torsion bars are a good source of cheap tool steel. Engine heads are a good source of casting scrap and quality hardware. Wipers, window motors, and starters are great for building machines. Understanding how to repair and diagnose this stuff is a major skill. Knowing how to make real controlled heat is fundamentally important.
I’ve never encountered single sources for this stuff.
- Comment on Question: Humidity controlled cabinet 1 week ago:
My experience may or may not apply here… In automotive paint refinishing back 15+ years ago, 2 part epoxy primers are special. Most primers are (were) 2k urethane. These are similar to automotive 2k clearcoat in how they work. They both have similar thicknesses, leveling after wet coats, and to a lesser extent - drying properties. With drying properties, the surface levels within a minute or so but it forms a surface film and the back side remains tacky for longer. (Where they differ is that clearcoat takes much longer to fully cure, like weeks to months, while primer is workable within an hour or less.) Epoxy primers are high build fillers. They get hard as a rock and are a pain in the ass to sand down. The two main reasons for using an epoxy are for super rough large surfaces, and this the the relevant bit here, they are used to seal the surface.
In paint, there are a ton of nightmare situations. Like let’s say some brake fluid got on the paint in a crash, or some idiot used rattle can enamel on a car. Often what happens is that the repair I am doing is not the first time the panel has been repaired. While I would like to clean the issue completely and use typical 2k primers, the previous repair may have used epoxy and buried something terrible. I’m not going to strip the whole panel and have to spray additional adjacent panels to color match when I did not estimate this in the cost quote. Epoxy seals out EVERYTHING. With stuff like spray can enamel, the painted surface never cures. It remains reactive to the solvent of anything sprayed on top of it. If ABS trim or bumper covers are exposed to acetone, similar issues with reactions will happen, unless 2 part epoxy primer is used. Epoxy primer is impermeable in the context of automotive paint; it is the nuclear option. Everything else allows some solvents to pass through it over time.
If you have ever touched the paint of new cars and noticed the softness, that is uncured clearcoat that is still venting solvents in small quantities. This is also why jams painting inside of the seals is kept to a minimum clearcoat thickness. The thicker the clear, the longer it will take to fully cure. As an ex pro painter, that softness tells me a lot about a finish too. It actually starts forming around 5 minutes after the clear is shot, just after the fingerprint test does not pull a string when removed. That is the first moment when I am able to barely graze the surface with fingertips and not damage the surface. It is still very wet underneath at this stage.
Hopefully that illustrates how even the hardest of painted surfaces is still able to allow stuff to pass through it. If you want to stop that stuff, you need a paint that is made specifically to seal everything.
That said, the seals and other materials also need to be up for the task. Most of those are likely just dust seals. How you deal with corners is critical. Just look at stuff like Pelican cases.
- Comment on Little reverse engineering project - road bike indexed shifting designed to print 1 week ago:
Yeah. Got a kit of it from a thrift store years ago and try to use it in jigs to save printing when possible… 4.3mm bolt holes, 7×2.3mm square nut slots and 12.7mm pitch. I have it and M3 memorized.
- Submitted 1 week ago to 3dprinting@lemmy.world | 5 comments
- Comment on Does Prusas textured sheet...work at all? 5 weeks ago:
It is just a cleanliness standard. It is not required. I spent a decade in the details of automotive paint. I only covered the surface basics for paint. What I call clean for paint is an order of magnitude more dirty than a surgeon, and they are orders of magnitude more dirty than a silicon chip foundry. When it comes to making plastic stick and look pretty, an automotive painter might be helpful for framing the scope of what is possible. All I can tell you is I have a Prusa and never have these problems, so I explained my experience and methodology as to why I do as I said. Again, sorry this upsets you.
- Comment on Does Prusas textured sheet...work at all? 5 weeks ago:
I have not had problems with glass or PEI. Your other comments indicate you tried ABS. That will never work without an enclosure, and even then, it will not work particularly well on any Cartesian machine. Sorry that illustrative examples and abstractive reasoning are offensive to you.
- Comment on Does Prusas textured sheet...work at all? 5 weeks ago:
It can coat the inside of the drier. Use Bounty paper towels as a control when in question. Bounty are often uses in automotive paint shops for a few reasons, but they are trustworthy for composition. If the two plies are separated, they make a good strain filter. That is the primary reason they are used. They also tend to be lower lint though not perfect. A tack cloth is used in the booth with controlled filtered air flow either across or down draft, so it is not a concern for perfect paint.
One of the tricks of automotive painting is to add a couple of drops of Palmolive dish soap to the water bucket used with wet sanding. It makes 3M Imperial Wet/Dry sandpaper last several times longer and acts as a mild degreaser the whole time. Any residue is cleaned in the booth stage using a special Wax and Grease Remover solvent that is the least reactive of the painting solvents. While this solvent is used extensively, still the fact that Palmolive dish soap can be used at all indicates how it is clean, consistent, and chemically irrelevant. Automotive paint reacts with many chemicals but specifically silicon is the worst problem. It causes fisheyes aka little divot like holes to form in the clearcoat. In most situations involving contamination and adhesion, silicon is the main issue that will be very persistent. It is so bad in automotive paint that in the worst cases, we turn to adding an actual silicon solution into the 2k clearcoat and trying to guess what concentration will match the problem area to level it. Otherwise, the entire job must be stripped to the raw surface and start over. Silicon issues only show up in the final wet clearcoat layer shortly after it is sprayed and leveled.
The reason why I have written all of this is to illustrate this point: the silicon is essentially floating on every underlying layer. The solvent has wet the area and the silicon just floats to the top of some filler, 2k primer, sealer, top coat color and when it gets to the clearcoat it blows a hole through it. There are two solutions. Use a two part epoxy primer that is a pain in the ass to sand, or clean the the raw surface with lacquer thinner or virgin acetone. In automotive paint, those two solvents are dangerous for causing a ton of other contamination and reactions issues. However, these are the only solvents that will take off silicon without diluting it and making the problem worse. Alcohol is a joke with no place in the automotive paint world when I was painting. I got out before water based stuff ruined the industry by making refinishing exponentially more expensive. That is only the color coat and some primers, so there may be alcohol used in some way in these, but it will not involve cleaning. Tire shine is the main source of silicon issues in automotive paint.
I have the empirical experience to know what I am looking at with cleaning and solvents. Alcohol is okay for minor issues, but think of it as constantly diluting and wiping the problem across the whole surface. Eventually, just use some virgin acetone to actually clean the thing properly. Paint is just plastic too. Each type requires a different type of tooth to mechanically bond to. With printing, I use 600 grit to lightly knock the shine off of the print plate surface. I go lighter on the textured sheet, but I only use the textured sheet with PETG because it is the only one that takes the textured pattern completely without showing layer lines. I print weekly on average, and use acetone and sandpaper around once a year. When I use glue stick, I clean the plate with dish soap after. I use alcohol in between. You will need an enclosure for ASA, ABS, and any larger PC prints regardless of the sheet or glue. Two IKEA Lack tables with legs stacked using double sided screws, then a clear shower curtain liner, and some tack nails does the job for under $50.
I would never use towels from any drier that has ever had fabric softener used in it for automotive paint. That is a contamination nightmare for me.
- Comment on Priming and sealing a painted print 5 weeks ago:
PLA will be better for hardware store and hobby junk. You cannot use automotive class finishes and expect them to last. Generally stick to one brand. Most paints are formulated for steel. ABS is the closest to steel in thermal properties. The expansion is the most important attribute. PLA has a different thermal profile so catalysed 2-part paints will not work very well long term. Rattle can enamel is junk by comparison, but it never fully cures like automotive paints. That property helps it stay in place longer in general. There are special adhesion promoters like bulldog for automotive stuff, but the thermal properties will still be an issue.
Pro automotive paint is 99.9% sanding and prep work. It is far more intense and rigorous than people realize. Perfection happens in the prep work. The actual paint is just a way of showing off that perfection. Mastering automotive paint is actually all about defeating yourself. Perfection is not subject to your emotions or expectations. It is right when it is perfect.
You want the highest pressure spray cans as possible. Also, if you do not used all of the can at once, flip it upside down and clear the nozzle by letting the siphon into the empty void and spraying. If you have a compressor that does not shoot out a bunch of oil or water, a cheap Harbor Freight pink gun with the nozzle of the can beside the spray gun will work wonders by atomizing the spray far more effectively.
- Comment on An Company(ies) that Converts Classic Automobiles to Automobiles with Solar Panels Built into Their Skins? 1 month ago:
I haven’t kept up with things, but that has to be like bicycle level light and lab conditions. I remember people talking about bicycling with solar and the required area was the size of a pickup truck just to power a basic hundred pound-ish touring kit, and even then it was only pedal assist on a cloudy day or hills. That was only 10-13 years ago. The main issue is that panels are not in any way optimally directional in practice. I expect 40 miles is down hill from the continental divide on I40, after parking the thing in the beam of a solar molten salt energy storage array for a day, during peak solar storm activity, but the fuck if I know bugger all. I know Dave did the math about one of the cars back when he was looking at various EVs. IIRC, no solar panels are more than 30% efficient, most are around 20-25% under optimal conditions. Then you half that or more when they are not directional. That gives a best case baseline for the energy they can produce based upon the sun’s output. I know panels have been improving, but we are well past any large scale optimizations and into the phase of scaling production to reduce cost. Do you know what they claim to have changed?
- Comment on An Company(ies) that Converts Classic Automobiles to Automobiles with Solar Panels Built into Their Skins? 1 month ago:
I think we may have a language barrier here. Solar panels on a car are a gimmick. They do not do not make significant energy to power the vehicle or change the batteries. The panels made are a sales gimmick to influence people that do not understand the technology and scales of the system. This is like putting the solar cell for a calculator onto an electric bicycle as an equivalent ratio of size and scope. The calculator runs on 3 milliwatts and the bike needs 300 watts.
- Comment on Those of you who are angry at the US for allowing ICE to stifle people's liberties - how do you channel your anger and irritation? 1 month ago:
- Comment on Those of you who are angry at the US for allowing ICE to stifle people's liberties - how do you channel your anger and irritation? 1 month ago:
No country on Earth is like this. No polity is unified without opposition. Additionally, making this statement here, when it is obviously false, in a place where at least half the people are from the US, and likely all of those are left leaning and just as much victims if not more so, seems like rather tepid malevolence.
- Comment on An Company(ies) that Converts Classic Automobiles to Automobiles with Solar Panels Built into Their Skins? 1 month ago:
The amount of power from built in panels is negligible relative to the battery. Solar panels are not vinyl film. They are actual semiconductors. They can be thin but are fragile. One can design a panel into some form of shape, but that is not a small task and is only possible with economy of scale for the tooling. Ultra thin solar panels have no real durability.
I am a pro automotive painter and have owned my own shop twice. I would not want this. Just reproduction body work is expensive. The custom stuff is even more. To make it into frivolous tech, that would cost orders of magnitude more, and the market to make it is so insignificant it would be a massive vanity project and loss. Then it is a nightmare when cars start burning from a few chips to the hood or roof on the highway because someone did not account for the short circuit potential in software and management circuitry. The total power of an optimal solar panel of equivalent size is irrelevant to the scale of an EV battery. Dave on the EEVBlog YT channel has covered this in years past with cars. Use the EEVBlog forum to search and learn more. That is the goto place for EEs.
- Comment on I built* an Android app to generate OpenPrintTags! 1 month ago:
You are solely responsible for vetting the software that you choose to run.
I do not review or care about the tools a person uses to create their projects. I appreciate the disclaimer when the person discloses their aptitude and confidence in their code.
Free software and Unix culture is a culture of hackers. Stallman’s very degree is in AI. Emacs is mostly a thing because lisp was adapted early on for AI development many decades ago.
Junk code is nothing new. X11 is notoriously bad, yet you likely have parts of it running on your hardware. Proprietary code is far far worse than anything a hacker posts as open source, yet you are running proprietary blobs on whatever device you are looking at now. Even if you are like myself with a libreboot machine, Leah readily admits that you need to run the core duo microcode if you want it to run right, and are not using that hardware for your primary device. The culture of antiAI is dogmatic nonsense. It is a tool, not a religion. It can be used harmfully or helpfully. I can’t fix stupid in anyone except myself. I do not fault anyone for what they run, the projects they share, or the background they come from. I encourage everyone to be positive and help their fellow hackers. I value participation and enthusiasm. Dogma and negativity are toxic.
I am ultra liberal. You have a right to all information, a right to skepticism, a right to error, and a right to protest in non violent forms aka the right to offend others. You do not have a right to infringe the rights of others.
This anti AI populism infringes the rights to all information and right to error if any administrative actions are taken. Your right to protest and skepticism is duly noted. If these become toxic in any ways that alter the dissemination of information, or toxic/harmful to the individual sharing information, I will remove the offending comments. If the person continues, I will escalate. I am only the janitor here. I clean up the messes. I do not matter, but neither does anyone else here. It is a community, and only the community matters. Garbage software is bog standard. Crusade against things that matter like proprietary software leveraged hardware theft and SaaS.
- Comment on I built* an Android app to generate OpenPrintTags! 1 month ago:
Thanks for sharing.
- Comment on Starlink Alternative that can't be blocked 1 month ago:
It is not a laser beam.
- Comment on Starlink Alternative that can't be blocked 1 month ago:
No. The primary way of blocking radio is by raising the noise floor across the band. The type of radio is irrelevant. The protocol is irrelevant. It is all only the electromagnetic spectrum from infrared light, to visible spectrum light, to radio light, through to xray or gamma ray light. How we divide that up into protocols, bands, and names is totally irrelevant. When transmitting radio light, we are all restricted in how much power we are allowed to send. All receiver circuits are listening for meaningful information above the noise floor. Bands are allocated to try to create spaces for certain types of communications. This controls the noise floor. Then electrical engineers design the hardware you buy to operate within this specification. If that noise floor is raised, the physical hardware is unable to retrieve information and effectively makes it useless. If you are a radio wizard and build your own transmitter that has more power, you just created a giant beacon that anyone will track easily to your location. Transmitting always reveals your exact location. In military operations, you constantly hear about some entity going radio silent. This is why. If you are a soldier, you may not carry a cell phone at all when on the job because it is constantly revealing your location. The only way to avoid this is with actually hard wire connections. You are able to use lasers for line of sight communications, but in practice, you will be limited by the optical lens focusing complexity and atmospheric distortion even from the ground with point to point regional communication. If anyone crosses the beam it will still be detected and is likely to leak some light depending on conditions and design.
Ultimately, your only real option is the sneaker net which is damn near useless in US suburbia hell. Don’t forget that the freeway system was not created for the citizenry. It is only about military mobility. That is why the Germans made the autobahn and why the USA and others had to copy the idea. Your only defense is in the democratic political space.
- Comment on YSK that Elena Kostyuchenko is an extraordinarily brave woman. 2 months ago:
Sure
- Comment on Expecting a LLM to become conscious, is like expecting a painting to become alive 2 months ago:
The first life did not possess a sentient consciousness. Yet here you are reading this now. No one even trued to direct that. Quite the opposite, everything has been trying to kill you from the very start.
- Comment on The family name goes first in East Asian names, reflecting the fact that they view family over individual; Whatever the parents' idea of "family" is, triumphs over the children's individuality. 2 months ago:
How do you punch holes in that dogma? I can think if many logical ways, but that is meaningless against the tribal structure.
- If family is so valuable, why didn’t strong families usher in the present age of technology
- intelligence, business acumen, and competency are not hereditary.
- team sports are a capitalist marketing scam. Putting a blue jersey on your sperm does not make it relevant or better than purple jersey’d sperm.
- patriarchal male culture is chauvinistic ineptitude and masochism marketed as a replacement for intelligence. It is an admission of subservience to those that dominate by thought and fundamental logic. Fools only fear a brute, civilizations fear a physicist.
- Strong families are only peripherally useful if capable of creating the opportunities and support needed to produce a physicist.
- We are all only a product of our environment. That environment is primarily a result of the opportunities and support given freely by its members. So if your family is not strong, one should look in the mirror first.
- A plant dies because you did not water it, not because of the room it was placed within.
- Comment on Chernobyl Fungus Appears to Have Evolved an Incredible Ability 2 months ago:
Obviously, all the junk noncoding DNA most life is carrying around likely includes some coping mechanisms for whatever potential situations arise. Like there is the one town in Iran with something like ten times Earth’s nominal background radiation and people are fine living there.
Makes me a bit concerned when this kind of thing is talked about and researched. Probably my cynicism, but if it gets out that most species have some genetic tolerance in a significant portion of the population, the potential for nuclear weapons use increases dramatically. I believe it is likely that early life had a lot more exposure to radiation, so early ancestors likely evolved the machinery. When the vast majority of DNA is noncoding, I think the probability is high. We come at the medical issue backwards, playing wack-a-mole with symptoms, rather than building a full ontological understanding of biology. That level is still centuries away. Hopefully we are less primitive murder orgy fans by then. We survived the world war of chemicals, and physics that followed. If we survive the world war of computer science, the world war of biology will be the brutal final boss for the starting planetary level of Evo’ Universe. Who bets we can beat the game on one evo life?
