𞋴𝛂𝛋𝛆

  • 525 Posts
  • 5.35K Comments
Joined 2 years ago
Cake day: June 9th, 2023
  • 𞋴𝛂𝛋𝛆@lemmy.worldOPMto3DPrinting@lemmy.world•[Blog] If fiber infused material is abrasive to soft metals, it may be useful as a sanding mediumEnglish
    2·
    17 hours ago

    So the trick to sanding longer with abrasives is wet sanding. In addition, in automotive work, a drop of Palmolive dish soap is added to a bucket of water. This addition makes a huge difference.

    Overall, the principal of like polishes like is important. In abstract, polish is just fine abrasion. Like your finger prints are around 5k-7k grit equivalent. Rub something long enough and you will both polish and abrade it the same as this grit. The oils in your skin are the polishing agent.

    I have played around with 10k grit wet sanding and then machine polishing with a light compound where places I rested my hand showed minor variations after stripping any oils and fillers with wax and grease remover (solvent).

    I can think of several aspects to increase the complexity here. One could add inserts into the outer vibrating shell. These could be any materials.

    I think the bigger issue will actually be the distance between the object and the shell. You see, the size of the random orbital action is the product of two concentric circles. In the pro automotive world, these are pneumatically driven. There are several models available with different properties related to this motion and the internal balance of the mechanism. Within this range of actuation, it is critical that abrasion does not follow a path of repetition. I think this likely means the shell must be larger than the radius of the largest of these two circles or maybe a more complicated size larger than the combination of overlapping radii including their central connection point. This should enable the part to move within the range of random sanding action. That range means the sanding is over a larger area.

    The best shell is likely one with gaps similar to a DA sander with ports for dust collection.

    Very little of any fiber touches the actual nozzle during printing. The actual fiber size used in filament is far far smaller than what most people imagine. It is only the waste dust from the production and processing of carbon fiber. All actual fibers of any useful length are sold in industry for use in composites. There are continuous fiber printers, but that is not at all related to what is used in 3d printing. If you actually look at the data from people testing materials, fiber infused materials are always weaker. They print better because they are breaking up the polymer bonds. Lots of people jump on the buzzword thinking it is technomagic mor betterer but do not pay attention to the details. If the fiber had any length to it, it would clog like crazy because a long bunch of fibers distributed in 1.75mm crammed into 0.4mm is never going to happen. It is just like a dust additive that happens to be available and is compatible. So it should be well distributed throughout. With ABS a wipe of acetone should help too, if left to completely flash off the solvent for a week or more. That needs to be super limited though. Acetone tends to get retained in bad bad ways with ABS. It is a massive no no to use in automotive applications.

  • 𞋴𝛂𝛋𝛆@lemmy.worldtoWelding@lemmy.ca•Is Laser replacing TIGEnglish
    2·
    2 days ago
    Yes, in automation this is relevant, but not in real world applications.

    I’ve done time as an operating engineer for asphalt plants, hobby hotrodding stuff, and painted cars professionally for several years where I mostly worked solo and do all operations, although I did have employees twice for a few years. I did some tig, but mostly mig in automotive and stick at asphalt plants while doing maintenance, which is likely far more than you realize.

    There are several hard facing jobs that get done at a plant. It is a nickel rod used to extend the wear surfaces of different parts. Hard facing gets you a lot of practice. It is applied to things like a wheeled front end loader’s bucket. You’re simply spending a couple of days making cross hatch patterns on all of the primary wear surfaces so the beads wear out instead of the bucket. The other one is the crushing hammers in a rock crusher.

    Most of the time with tig, you’re messing with ultra thin or dissimilar materials. There is a ton of nuance required to understand temperature, expansion, and how heat flows through various surfaces. Your prep and cleaning are super critical. These become the main job. Automotive paint is exponentially more prep oriented, but still, actually striking an arc is only around 5% of the work for tig. Your setup, cleaning, and prep are a far bigger part of the job. You’re building a strategy to manage heat and expansion. The actual process of controlling the molten pool is complex. In both welding and machining, your primary sensory feedback is actually sound. That is how you know when the settings are dialed correctly.

    In all of this, it is very possible to setup automation to replace the welder. You’re just going to need to spend a long time setting up the machines and ruin a couple dozen workpieces to dial in the operations until the weld passes xray and empirical tests.

    Seeing someone make metal sticky is totally irrelevant except in decorative consumer junk. If someone is going to be facing life or death because of the quality of the welds, the expectations and requirements are stringent. In those circumstances, the human welder will not be replaced unless the goal is to make hundreds of items or more. The human is far faster and cheaper at any smaller scales. One day there will be something like humaniform AGI, and long after these, one might specialize in this type of operation, but this kind of sensory and spacial awareness, with very complex feedback systems are orders of magnitude beyond anything that exists in the present. Just the software complexity for the humanoid robots that already exist is ridiculously impossible to coordinate in a high level meaningful way.

    If you want to weld, you’ll have a job. Just be aware that it sucks as a job. The fumes are toxic awful. Tig in particular sucks because you are going to slip and touch the tungsten to the weld pool from time to time. That causes a flash that is way brighter than any welding hood you can actually use will block. It will blind you over time. If you use an auto darkening hood at all with any form of welding, you will lose most if not all of your vision later in life. That fraction of a second before the glass darkens is faster than your brain can process, but it is not your brain getting damaged, it is your eyes, and that electromagnetic radiation and searing photons are still getting to your retina and damaging it a little bit every time. Selling your body parts off to eat today is an insidious haunt you’ll likely regret one day. You may think you’ll wear a mask/respirator, but you’re going to find yourself in extremely cramped, hot, dirty, nasty, scary AF places where you must find a way to get the weld done right. You do not matter in these circumstances. Your skill and pay is largely measured by your willingness and ability to never say no and get the job done. That is how you make a decent paycheck welding.

    I’ve been on a fully extended manlift a hundred feet in the air, in a gusty wind, with the tipping alarm going off, getting motion sickness, with the bucket periodically banging against a silo so hard I could barely stand.

    I’ve crawled into a tiny opening of a tractor trailer size drum cylinder made of steel that was barely under 140° F in air temperature, with it pitch back because I went in the actually pitch-tar shoot where hot dry aggregate mixes to make asphalt – exits to go up the silo elevator. I got burned through my coveralls because the surface was so hot. I was pouring sweat, and it sizzled on everything it touched. I replaced a large steel shelf called a flight inside. I had to cut it out, dig out the aggregate, and weld in the replacement as fast as humanly possible because the way the old flight failed stopped the elevator full of asphalt on the chain and buckets. If that stuff solidified beyond what the motor and transmission could overcome to restart, it would have cost hundreds of millions of dollars in the middle of a major freeway paving operation in the middle of the night. Chiseling out the elevator takes at least 3 whole days. I actually ruined my favorite boots doing that one, the bottoms were melted beyond any further use. That is the kind of thing to expect. In an expensive place like Southern California, if you can do jobs like that, and don’t mind the diesel fuel bath afterwards to get the tar off your skin and clothes, you’ll make a six figure income and afford to live in a lower end 3 bedroom house kind of life.

  • 𞋴𝛂𝛋𝛆@lemmy.worldOPtoFediverse@lemmy.world•I think the fediverse needs Android like hardware packagingEnglish
    1·
    2 days ago

    Not in terms of kernel supported encodings and long term kernel support, from what I have seen. I have not looked into this in depth. However, looking at git repo merged pulls, issues raised, and the lack of any consistent hardware commitments or consensus, implies to me that the hardware is very unstable in the long term. When I see any hardware with mostly only base Debian support, it screams that the hardware is on an orphaned kernel and will likely never get to mainline. The same applies to Arch to a lesser degree. Debian has the primary tool chain for bootstrapping and hardware hacking. When it is the primary option supported, I consider the hardware insecure and unsafe to connect to the internet. I’ve seen a few instances where people are talking about the limited forms of encoding support and the incomplete nature of those that do exist. It is far more important to have hardware that will be supported with mainline kernel security updates and is compatible with the majority of encodings. It would be terrible to find out the thing could not support common audio or video codecs. IIRC there was an issue along these lines with the RISC-V PineTab.

    I know the primary goto for RISC-V is SiFive, but I have not seen a goto LTS processor from them in terms of third party consistent use.

    Plus, while more open is mor betterer, RISC-V is not full proof from a proprietary blob either. The ISA addresses the monopolistic tyranny and extortion of players like Intel, but there is nothing preventing the inclusion of 3rd party proprietary module blocks. The entire point is to create an open market for the sale and inclusion of IP blocks that are compatible with an open standard. Nothing about these blocks is required to be open. I don’t know if such a thing could be set to a negative ring more privileged than the kernel, but I expect this to be the case.

  • 𞋴𝛂𝛋𝛆@lemmy.worldOPtoFediverse@lemmy.world•I think the fediverse needs Android like hardware packagingEnglish
    11·
    2 days ago

    Most people’s routers are already up 24/7.

    We should be able to do our own DNS. Who cares if it is on the wider clearweb. You are paying for an IP address with your internet connection. If you are running a server with verified hardware and signed code, all we need is a half dozen nodes mirroring our own DNS. There must be a backup proxy for the few terrible providers that cause issues with IP. The addresses are not static, but they do not change very often. At worse, you hit a manual button to reset or wait 10 minutes before the DNS updates.

  • 𞋴𝛂𝛋𝛆@lemmy.worldtomemes@lemmy.world•"Hey look son, this person did something impressive, why not be more like him/her?"English
    5·
    2 days ago

    Your slice of life is funny. At least you don’t get: …(news: “terrible shit is happening”) …the bible says…the sky is falling…the end times…Armageddon… Come back to (sadistic masochism where everyone goes through the motions and no one is intelligent or real or cares about anyone as evidenced by their actions) kingdom hall. (be like the rest of us that never paid any attention to the conspiracy level nonsensical explanation of the reason why Jehovah’s Witnesses exist in the Revelations book.)

    I don’t know, it might be fun to improvise against some fresh hate materials. The same thing all the time gets old but polished responses.

  • 𞋴𝛂𝛋𝛆@lemmy.worldOPtoFediverse@lemmy.world•I think the fediverse needs Android like hardware packagingEnglish
    11·
    2 days ago

    It is not about the people that already host. It is about enabling many more by giving them an option to buy a path of least resistance. In exchange, it creates a potential revenue source in a completely untapped demographic. The subscription/donations demographic is like a very unique and niche market. The vast majority of people do not exist within that space. Most people do not have the financial stability to engage like this. It is not that they are unable to accumulate adequate funds, it is that their pay fluctuates over time and their baseline constraints are far more stressful than spending from times of surplus and opportunity. Catering only to those with such surplus and gatekeeping the complexity of self hosting is massively limiting adoption.

    The rule in managing a chain of retail stores is that, no matter how you select products to stock in stores, it is impossible to only select products that will all sell on one platform. How you manage the overburden always determines your long term success. You must employ other platforms and demographics to prioritize the mobility of cash flow.

    Similarly but inverted, this place has a slice of all demographics. Efforts tailored to the various subsets should tap entirely new potential. A fool imagines they can convert the unstable poor*'r* into a reliable stable income source via donations. Someone like myself has means but not a situation that is compatible. If I have some tangible thing to purchase, I can make that happen. I do not have any subscriptions in life for anything at all. Heck, I won’t even shop on any of my devices I use regularly because I only buy what I intend to go looking to purchase with intent. That is not common, but what is common are spontaneous people that need time to align their finances with their desires. That person is likely to dread paying $5 every month compared to $250 in May when they get a couple thousand dollars on a tax return. Expecting the public to float the stability is stupid. That is not how the real world works. Real businesses always float the overhead. I’m talking about how to free the masses to self host everything for the cost of a nice router spent once with no techno leet filter.

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