WaterWaiver

joined 2 years ago
[–] [email protected] 3 points 1 week ago* (last edited 1 week ago)

There are some youtube videos of people machining them (sadly my browser does not support smell). Looks like you treat it like any other solid material: hobb or mill the teeth. This is much more expensive than 3d printing.

You might be surprised by your 3d printed gears. If you keep the detail size large they work really well, but backlash is definitely an issue.

 

FR2 is the brownish material that many cheap circuit boards are made of. It's a mixture of phenolic resin and paper. Apparently it's quite useful to make gears out of:

Phenolic Gears exhibits superior shear force, help reduce machinery noise, absorbs destructive vibration unlike metal gears, phenolic is non-conductive, protects the mating metal gear train, and are known to outlast metal gears under severe continuous service. (source: https://www.knowbirs.com/phenolic-gears )

(Main pic stolen from here)

(Many more pics here)

Has anyone seen these used anywhere? I've read a hint regarding pool equipment, but I have never seen them there. I assume the fibres allow them to last longer than plastic/resin only gears.

[–] [email protected] 2 points 2 weeks ago* (last edited 2 weeks ago)

I happily ran THUGPRO under wine, so I assume rethawed would be the same. Dunno.

Where am I even supposed to buy it if I wanted to, which I don’t really,

Looks like it's abandonware. Yeah, publisher dropped the ball.

[–] [email protected] 2 points 2 weeks ago

Changing virtual desktops works for me, no patches needed. I have to use it often because of how many games don't understand multiple monitors.

[–] [email protected] 2 points 2 weeks ago

Technically they have some differences, but the biggest from a user's perspective is how they are delivered and by whom. Wine is manually installed by you from your distro's package repo. Proton is provided by steam when you install a windows game on a Linux steam instance. If one breaks then you complain to the relevant party.

[–] [email protected] 6 points 2 weeks ago (2 children)

Might be worth checking out ReThawed.. You can choose the physics models, UI, characters, tricks and maps from all of the old THPS games.

I tried THUGPRO previously (another community mod in similar vein) and it was fun, especially the mods to the park editor (overlapping objects!) and Sonic Adventure maps.

 

Two different sizes shown. Each has two inductors (grey bits) stuck to a capacitor (middle) with some metal end caps acting as terminals. There is a third terminal underneath the capacitor. Grid in background is 1mm, pics stolen from LCSC.

I think this taped picture is also really cool (stolen from here):

Datasheet: https://www.murata.com/en-global/products/productdata/8796766699550/ENFE0002.pdf

[–] [email protected] 7 points 4 weeks ago* (last edited 4 weeks ago)

If you end up buying some flux then I'd recommend you also buy and try a block of violinist rosin:

https://www.ebay.com.au/itm/315948528490

You break it up and then dab chunks onto your joint whilst soldering. Some will melt off and then burn. From there it acts just like any flux: reduces the metal oxides, makes the solder suddenly flow (behave) a lot better and provides some level of temporary oxygen shielding with its off-gassing products.

Pros:

  • Cheap
  • Doesn't smell awful
  • Long working time (easy to use)
  • Very simple ingredient (distilled pine tree sap) made by many manufacturers, so it will never go out of stock.
  • Residues are non-conductive and can be safely left on your boards
  • Residues are reasonably easy to clean (isopropyl & most board cleaners work; ethanol also works but tends to leave ugly white streaks)

Cons:

  • Smoke is still harmful (smoke = incomplete combustion compounds)
  • Residue is dark, unlike the transparent residue of many no-clean fluxes, so it can hamper inspectability for mass manufacture.
  • Best handled with tweezers, otherwise your fingers end up feeling sticky (pine resin compounds are slightly sticky)
  • Not Modern or youtube popular, so people will tell you that it's therefore bad or worse than other products.

I use it often, it's my favourite for both big joints and fixing smd work. Grab some and try it :) The worst you will be out of pocket is a few dollars.

I've had some issues with other flux products I've used because of their alcohol content boiling off & cooling my board whilst I'm trying to heat a region up to work on it. Solid rosin doesn't have that problem, you can dab it on whilst the iron is still covering some SMD joints (eg QFP pins) on your board and it will work instantly.

[–] [email protected] 9 points 1 month ago* (last edited 1 month ago) (1 children)

Ooh thankyou for the link.

“We can leverage it [ray tracing] for things we haven’t been able to do in the past, which is giving accurate hit detection”

“So when you fire your weapon, the [hit] detection would be able to tell if you’re hitting a pixel that is leather sitting next to a pixel that is metal”

“Before ray tracing, we couldn’t distinguish between two pixels very easily, and we would pick one or the other because the materials were too complex. Ray tracing can do this on a per-pixel basis and showcase if you’re hitting metal or even something that’s fur. It makes the game more immersive, and you get that direct feedback as the player.”

It sounds like they're assigning materials based off the pixels of a texture map, rather than each mesh in a model being a different material. ie you paint materials onto a character rather than selecting chunks of the character and assigning them.

I suspect this either won't be noticeable at all to players or it will be a very minor improvement (at best). It's not something worth going for in exchange for losing compatibility with other GPUs. It will require a different work pipeline for the 3D modellers (they have to paint materials on now rather than assign them per-mesh), but that's neither here nor there, it might be easier for them or it might be hell-awful depending on the tooling.

This particular sentence upsets me:

Before ray tracing, we couldn’t distinguish between two pixels very easily

Uhuh. You're not selling me on your game company.

"Before" ray tracing, the technology that has been around for decades. That you could do on a CPU or GPU for this very material-sensing task without the players noticing for around 20 years. Interpolate UVs across the colliding triangle and sample a texture.

I suspect the "more immersion" and "direct feedback" are veils over the real reasoning:

During NVIDIA's big GeForce RTX 50 Series reveal, we learned that id has been working closely with the GeForce team on the game for several years (source)

With such a strong emphasis on RT and DLSS, it remains to be seen how these games will perform for AMD Radeon users

No-one sane implements Nvidia or AMD (or anyone else) exclusive libraries into their games unless they're paid to do it. A game dev that cares about its players will make their game run well on all brands and flavours of graphics card.

At the end of the day this hurts consumers. If your games work on all GPU brands competitively then you have more choice and card companies are better motivated to compete. Whatever amount of money Nvidia is paying the gamedevs to do this must be smaller than what they earn back from consumers buying more of their product instead of competitors.

[–] [email protected] 25 points 1 month ago* (last edited 1 month ago) (4 children)

really flashy guns and there is a very intricate damage system that runs at least partially on the GPU.

Short opinion: no, CPU's can do that fine (possibly better) and it's a tiny corner of game logic.

Long opinion: Intersecting projectile paths with geometry will not gain advantages being moved from CPU to GPU unless you're dealing with a ridiculous amount of projectiles every single frame. In most games this is less than 1% of CPU time and moving it to the GPU will probably reduce overall performance due to the latency costs (...but a lot of modern engines already have awful frame latency, so it might fit right in fine).

You would only do this if you have been told by higher ups that you have to OR if you have a really unusual and new game design (thousands of new projectile paths every frame? ie hundreds of thousands of bullets per second). Even detailed multi-layer enemy models with vital components is just a few extra traces, using a GPU to calc that would make the job harder for the engine dev for no gain.

Fun answer: checkout CNlohr's noeuclid. Sadly no windows build (I tried cross compiling but ended up in dependency hell), but still compiles and runs under Linux. Physics are on the GPU and world geometry is very non-traditional. https://github.com/cnlohr/noeuclid

[–] [email protected] 7 points 2 months ago* (last edited 2 months ago) (1 children)

Triangle is an amplifier and rectangle is a black box ("don't worry what's in here, we promise it's not gremlins").

I suspect that the box might be a biasing array for driving the two output transistors, but then I would also expect two wires to come out of it (one for each transistor) rather than a single combined wire.

Broadcom's datasheet for their version of the part seems to be more akin to what I'm thinking:

Could be either. You'd have to decap the chip to find out, the datasheet writers thought these details were not important.

I have no idea why two of the output pins are tied together. They're not using many of the pins on this package so maybe they thought "why not". I've also seen dual-optocouplers in this same 8 pin package where pins 6 & 7 are the outputs of the two separate couplers.

[–] [email protected] 1 points 2 months ago

Some guy at the factory is removing the third paper from every unit before it gets boxed.

[–] [email protected] 3 points 2 months ago

So many CMCs seem to be marketed based of visual appearance and hope. I guess maybe people already have a design that works, so they go for things that look like clones visually? Otherwise I don't get how anyone would choose their product when there are alternatives with actual specs.

Another gripe: When the only datasheet available is a combined one with tables and graphs listing the specs of dozens of part variants. But yours isn't on there. So you find two similar models in the list and mentally interpolate between the graphs whilst worrying whether or not this is a long-term supply item or some spares that a retailer is selling off from a custom order run.

[–] [email protected] 4 points 2 months ago (1 children)

I just realised how hard it would be to manufacture this thing.

Imagine having to bend those copper wires into that shape around an already-existing toroid ring. Or maybe they glue together a few pieces of ring?

 

The thickness of the board beneath it gives deceptive scale. It's about 50mm tall and the toroid is 85mm in diameter.

https://www.lcsc.com/datasheet/lcsc_datasheet_2408061709_Ruishen-RSCM11548-5mH-3P_C37634003.pdf

I was looking for much smaller CMCs. Also the datasheet for this part doesn't have impedance-versus-frequency graphs so I refuse to buy it anyway :P

 

Context: I am not a fridgy, I work with electronics. I would love to answer my question by tearing open a dozen different aircon units, but I'm sorely lacking in that department.

Question: Are there some optional components or fancier materials that are simply too expensive to use in the lower end aircons; but are used in the higher efficiency expensive units? The range of COP/EER I see advertised is wild, from 2 to 6 or so.

I already vaguely understand that these things help efficiency:

  • Bigger indoor & outdoor coils with more metal in them (working fluids get returned hotter/colder gives better carnot efficiency)
  • Operating compressor at its optimal power level (I believe they have an efficiency vs power curve with a single peak, so it's better to use a bigger compressor if you need more power output)
  • Inverter control instead of on/off control (most situations, but technically some use cases will have them on par)
  • Choice of refrigerant (but that seems to be controlled in my market, I have not seen many options)

Is there anything else they change? Or is that most of the difference?

 

Location: Sydney, Australia. Found it during bushcare.

The brass barb fitting and the powdery filling suggest some sort of kiln burner to me, but the dark green paint on the outside of the tube looks rather ordinary and not like it has been through high temperatures.

The soft, powdery cemetitious filling has a copper-green tint. Only one end has a hole.

If it were not for the brass barb and coppery fill colour I would assume this is just a bit of structural steel from someone's carport (or similar) that has filled with cement and now been cut to pieces for disposal. But a carport with a barb fitting? WTH?

We find all sorts of garbage in this bushland because it's sandwiched in suburbia. Traditionally it was a dumping ground (mattresses, furniture, asbestos, whole cars) and today still people use it illegally as a dump (mainly building materials and soil). Lots of random materials get deposited by or uncovered by stormwater runoff & floods too. There is no limit to the craziness of what you find here.

 

8PM (right now) +/- 10 hours

Better call the tiberium harvester back in.

1
submitted 10 months ago* (last edited 10 months ago) by [email protected] to c/[email protected]
 

Encountered this fellow during bushcare today. He was sitting right on top of the bridal veil roots we were pulling, looking suspiciously like a rock.

We probably shouldn't have handled him (I hope turtles don't get dizzy from being turned upside down). We put him back down and hid him under some other groundcover as a local Kookaburra was loitering.

 

Imagine you're in the blue car, wanting to turn left:

Green is turning right. There is only one lane.

Two options I see:

(1) Stay behind the green car, to the left (and behind the crossing) until they leave.

(2) Pull up to the left of the green car (as if there were two lanes).

I assume (1) is correct given there is technically only one lane, but I can't find any materials on the NSW site or driving handbook about it and (2) is something I see other people do.

(I have my license test next week)

EDIT: Solved, option (2) is the right one. see https://www.nsw.gov.au/driving-boating-and-transport/roads-safety-and-rules/sharing-road-overtaking-and-merging/overtaking-safely

The only time you can overtake on the left is when the vehicle you’re overtaking is:

  • waiting to turn right or make a U-turn from the centre of the road
 

I could not find any mentions of these problems online. The article itself has no technical detail.

Looking forward to seeing what the actual problems are. It seems this is the first product to market.

Guesses based off the general subject matter:

  • Silica concentrations probably vary depending on the exact position of your head, especially since it's heavy material. If you mount this sensor even a few meters away from a worker then it's readings could possibly become invalid, eg because an angle grinder is firing dust a different direction to the sensor.
  • Silica is a slang term for a very big category of materials. Some might look completely different to others under certain laser observations, leading to some getting missed (bad) and others materials triggering false positives (leading to the sensor's screams being ignored by workers).
  • Self-cleaning routines might be needed to stop it clogging up, otherwise the sensor starts reporting a higher baseline. They could either choose to report this ("pls clean me" light comes on) or ignore it (bury head in sand mode).
  • Alternatively it's performance might actually be fine, but perhaps it's still being spruked inappropriately. Government involvement in funding the project might (?) magnify this problem.
 

Context: https://aussie.zone/post/5207334

I'll make an account through Slrpnk if this doesn't work.

1
submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]
 

“And then we’re going to add this suspension into some hexane. I mean here I’m just using Shellite because it’s from Bunnings and I dunno who else uses this so I feel like if I stop buying it Bunnings will stop selling it so, it’s like a couple of bucks and it’s like hexanes, it’s so good, Bunnings keep selling this please”

 

Key excerpt:

According to the late professor Patrick Troy, here's how things were viewed in the early 1970s:

"The cost and price of housing continued to be a source of social and political concern. Over the period 1969-1973 the number of years' average earnings required to buy a house site increased substantially. In Sydney, it increased from 1.7 to 2.7 years, while in Melbourne it grew from 1.2 to 1.8 years."

Compare that to what modern researchers have to say about Australia in 2023:

"Since 2001, the national ratio of median house price to median income has almost doubled to 8.5, and the time required for the accumulation of a deposit for a typical property has increased from six years median earnings in 1994 to 14 years currently."

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