Eranziel
@Eranziel@lemmy.world
- Comment on Canadian Athlete Caught Using Performance Enhancer 2 months ago:
Which athlete / event was this?
- Comment on why isn't anyone calling for Trump to drop out. 4 months ago:
There is no way that arming Taiwan results in Taiwan starting a war of aggression against China.
What arming Taiwan does is make it an increasingly bad idea for China to invade Taiwan. It’s a deterrent to make sure the nuclear power who constantly threatens Taiwan (read: China) doesn’t think they can just go and take what they want without consequence, and probably commit a little genocide on the side.
You know, like Ukraine.
- Comment on I Will Fucking Piledrive You If You Mention AI Again — Ludicity 4 months ago:
This. Satire would be writing the article in the voice of the most vapid executive saying they need to abandon fundamentals and turn exclusively to AI.
However, that would be indistinguishable from our current reality, which would make it poor satire.
- Comment on How many times will I tell you? 8 months ago:
No, close the lid because that’s how you avoid coating everything in the room with a film of urine and feces. Open toilets are disgusting.
- Comment on Why do we still use stepper motors? 9 months ago:
That sounds like a problem from using too small of a drive. Every torque curve I’ve seen for brushless DC or AC servos is constant torque from 0 to about 75% rated RPM, and then starts to drop off.
- Comment on Why do we still use stepper motors? 9 months ago:
Well, that’s why you use a proper servo drive. Yes, technically they oscillate at standstill, but it’s so little it literally does not matter. Closed loop servo control is a solved problem unless you’re trying to implement it yourself.
- Comment on Why do we still use stepper motors? 9 months ago:
I don’t know why you’re getting down voted. You’re correct, steppers are used due to cost.
- Comment on Why do we still use stepper motors? 9 months ago:
I disagree with all your points. What kind of servos are you talking about?
BLDC and AC servos maintain full torque at stop too, and have about 2-3× the torque of a stepper of similar size.
The only way a stepper can rival a servo for precision is with a high degree of microstepping, which is far from guaranteed positioning with open loop control.
I haven’t directly compared response time between steppers and servos, but I would be extremely surprised if there’s a significant enough difference to worry about. Most servo-controlled machines are larger and so are designed to accelerate slower than a printer, if that’s what you mean. This is intentional because inertia is a thing you have to worry about, not because the servo reacts to command changes slowly.
There are valid reasons steppers are used on printers, but it’s not because they have superior performance.
- Comment on Why do we still use stepper motors? 9 months ago:
Cost is the short version, yes.
I don’t know what kind of servos everyone here is talking about that are less precise than open loop steppers. Low quality hobbyist stuff, I guess? Proper servo motors & drives are the standard for good reason for robotics, industrial CNC machines, and pretty much everything else that needs powerful motors with high precision. Much higher power density, higher RPM (good for increasing torque with a gearbox), equivalent or better precision, plus closed loop control is a huge capability and safety gain.
That said, good, industrial quality servo motors are 1) expensive and 2) aren’t made in small enough sizes to be comparable to the steppers on most 3D printers. Even the smallest industrial servo + drive I’ve seen is about 5x as big as the steppers on a personal 3D printer and costs $800ish. Obviously, both are deal breakers for a personal 3D printer.
3D printers are a fairly ideal application for steppers. The moving parts are small and light, meaning you both don’t need a large motor and the danger of slippage is lower. Plus, steppers are cheap.
- Comment on WB’s ‘Ready Player One’ Blockchain, VR, AR, AI ‘Readyverse’ Will Of Course Be A Disaster 10 months ago:
NFTs do not solve the problem of proof of ownership. Nor can they. If someone steals it from you - whether by trickery, force, or any other means - it’s just as lost to you as any other stolen thing, digital or physical. (Not to touch on the fact that NFTs to date have just been URLs to web hosted media, i.e. ridiculously non-unique and insecure.)
Also, your whole paragraph about theoretical NFT replacement for DRM is just describing a different kind of DRM.
- Comment on Robot mistakes man for box of peppers, kills him — Malfunctioning sensor system blamed for technician’s death at Korean food plant 11 months ago:
In any industrial context, a “robot” is short for robotic arm. Those things you see in footage of automotive factories.
They also don’t have any kind of AI. It’s just a regular (if specialized) computer in control.
- Comment on Deepfake Porn Is Out of Control 1 year ago:
“Just stop considering it scandalous” is a severe lack of imagination. Even if/when the stigma of “having a sex life” is gone, the great majority of people consider their sex life to be private. Video floating around that looks like you having sex is a very different thing to hearsay rumors.
Keep in mind that the exact same techniques could be used to sabotage adult relationships, marriages, careers, just as easily as teenage bullying. This isn’t a problem society can shrug away by saying sex should be less stigmatized.
- Comment on X updates its Terms to prohibit crawling/scraping of its data 1 year ago:
Lol, then they would have to demonstrate that there were damages. The worst a TOS violation will get you is a ban.
- Comment on Why don’t we use radiators as heat sinks in the summer and pump cold water through them? 1 year ago:
It’s more because of the temperature differential. The more difference between the temperature of two objects, the faster they change temperature. A radiator with 50 degree water is ~30 degrees warmer than the room (or 80+ degrees for a steam rad), while cold water is going to be 10-15 degrees cooler than the room. Any colder and you need to use not-water so it doesn’t freeze. Condensation or frost is also a big concern to avoid property damage.
- Comment on A key feature of NFTs has completely broken / Web3 was supposed to make sure the original artist always got paid. Not so much anymore. 1 year ago:
It’s broken now? I’d say that’s a bold assumption that it ever worked in the first place.