morbidcactus @ morbidcactus @lemmy.ca

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9

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606

Joined

2 yr. ago

If you're not familiar with the table, use a select top 10 * from table if you're on sqlserver, postgresql uses limit and oracle has fetch.

Don't recommend select * without limits or conditions unless you absolutely know the table, you can very quickly make a DBA unhappy

Yeah noted this with a few other .world communities too. As far as I can tell it's only doing it with lemmy.world communities for me

Crawler is possible, still need to get into the line though, I recall there being a few options for tethered camera crawlers meant for sewer inspection. Visual does have drawbacks, can't really size defects, as far as I recall it's difficult to get full coverage and cleanliness is even more important, and you'd general need the operations on that pipe to cease. Ideally you want your inspection regiment to allow you to know something's coming and be able to plan for it, example if I start seeing vibration increasing on some bearings, I can monitor them and start planning for their replacement on a scheduled shutdown.

No inspection is actually a totally valid mitigation plan for some assets. Criticality and failure consequences play a large role in that as well as the feasibility to inspect. Electrical devices for example follow random failure patterns and historically don't really have a timeframe between failure initiation and functional failure that's actionable, so a mitigation strategy I've seen done is something like hot spares if it's critical. On the other hand, something that is inspectable but won't result in high consequence of failure (death and injury are the things that are usually weighted heavily) it might not be worth inspecting either, it's all about trying to get the most out of limited maintenance budgets.

I did smart pigging and challenging pipeline stuff years ago and reliability engineering up to a few years ago, also got out of o+g for similar reasons.

Totally agree and just adding on to all that, even if it was steel, I'm super willing to bet it'd be impossible to run a normal pig through, so much infrastructure is just full of diameter changes, unbarred tees, really tight back to back bends etc, I can only imagine the challenges to pig a line like that, let alone costs involved with specialised tooling and support work, I know some people who did a short run through a downtown core on a gas main and that needed hot taps, road closures and a really special pig for what was less than a kilometre.

Supposing it could be pigged without blowing up their entire maintenance budget, I wouldn't want to touch any of the water coming out of that line during operations, so you'd also interrupt water service for a while, having a solid reaction plan really would be one of the best solutions.

I actually really like Metro, live tiles are criminally underused and imo it gets a lot of hate becauae of how microsoft pushed it in windows 8, but for a touch interface it's clean and really nice to use. Loved the sideways laid out apps too on windows phone and windows rt, wp itself was actually really nice to use and I actually kinda miss my lumia 1020

Generally lubricate every few hundred hours, however you really should consider condition based lubrication over time based, over lubrication is actually a really common failure mode for rotary bearings and would not be surprised if the same is true for linear bearings. 50km intervals sounds like an order of magnitude too frequently based on what I recall from Thompson, yeah the bearing type, loading, cleanliness etc all play a part, but their examples are in the hundred of km range, not tens.

Are you ensuring that you're actually getting grease into the bearing as well? The MGNxxX bearings are usually sealed, you need to get past them to actually lubricate as you want to expel the degraded grease. Myself, I do some white lithium via syringe and then machine oil on the rails, and even that's probably excessive. Moving the bearings by hand along their length of travel will give you a feel for them as well, there's a lot more you could do but I'll be totally honest that it's probably not worth doing, consequence of failure is basically nothing in the hobby space (no risk of injury, low costs, no impacts to business, basically if a bearing goes you're out what like $50? and an hour)

A lot of industry does use grey water or untreated water for cooling as it's substantially cheaper to filter it and add chemicals to it yourself. What's even cheaper is to have a cooling tower and reuse your water, in the volumes it's used at industrial scales it's really expensive to just dump down the drain (which you also get charged for), when I worked as a maintenance engineer I recall saving something like 1m cad minimum a year by changing the fill level in our cooling tower as it would drop to a level where it'd trigger city water backups to top up the levels to avoid running dry, and that was a single processing line.

I can't find much literature about it, did find this safe handling procedures from UNSW Sydney if interested. I'd say if you're concerned, don't use it. The fibres themselves to me are a concern when out of the polymer, so take precautions when sanding or cutting, glove up and wear a mask + eye protection, probably should consider wet sanding too to reduce airborn dust. Print in an enclosure with ventilation, same precautions you'd take for abs and nylon, you don't want to be around that when it's printing. As I said though, if you do have any concerns, don't use it, there are matte finished filaments if thats the look you're going for.

What was CNC kitchen's concerns? As above, personally I'd be concerned while disturbing the plastic through printing, cutting, sanding etc, just handling it wouldn't be on the top of my list unless the plastic has degraded or been damaged in some way, pretty much how I'd treat anything with fine fibres or particles in it.

At the end of it, I'm just some guy on the internet, if you have concerns, don't risk it. If you do decide to use it, treat it with respect like you would anything with fine particles or fibres.

Will echo the recommendations of debian or mint. I have mint on my 13 year old rog laptop, it's my lab computer and runs klipper for one of my printers, pretty much always up, very rarely reboots. Debian is what I run on my 4 year old zenbook s, pretty much perfect for my uses, it's what I cart around for light/mobile work and I swear it actually has better battery life than it did running windows.

A good chunk of it is relating to the elastic search stack, yeah it's a thing people do.

Apparently goo gone has limonene in it, I'd be wary of putting it anywhere near filament depending on the plastic used. I'm personally on the side of clip it and be done, I try to use as much as possible as well, have had the tail out on some spools get caught in the reverse bowden I use depending on the way its been wound, so I do tend to be on the cautious side and why I have smart filament sensors. Would rather lose 5g of filament over failing a print and wasting even more.

KeepassXC seems to register as DRM protected content (I think...) for me, kills moonlight streams while it's up so at the very least using a password manager (which you already should be using) would be protected?

I already daily drive debian on my lab computer and laptop, guest I'll be swapping my desktop over in the not to distant future...

Windows on arm was a thing, I had a surface 2 rt about a decade ago, too bad it never felt like microsoft ever really fully committed to the idea imo, and yeah x86 apps wouldn't run on it (though there was an emulation tool apparently, was community developed). Market was definitely there (though I'm not sure how big it was, probably a cross over with netbook users), they just fumbled it like they did windows phone in my view.

I'll look at it for sure thanks! I think I was going to try it a while back but never got around to it as I figured the tap probe would handle it, found it most important to keep the nozzle clean (shocking I know considering it's my z probe!), I had a cleaning macro before I installed the kinematic bed, might set that up again when I get around to it, need to make some height adjustments to the models as the bed itself sits higher than stock.

I have 2 doors with the 270 deg hinges with latches, but I'm honestly super interested in something like the clicky-clack for sealing, theres a slight gap between mine and I've not got around to making something to fill it without getting in the way. I have little tiny windows on mine

Super impressive it stayed adhered honestly, I had that happen with buildtak but not with a standard pei surface.

I have ACM on mine, definitely recommend, did need to print thicker panel mounts for them though. Those definitely sound like some decent chamber temps, I've had decent enough results in the 40s, I'd be interested to see where ACM + bubble insulation goes.

What's your chamber temp with bed fans like? I just mounted a chamber thermistor (on the floor, I don't feel like running cables through the drag chain right now) that I need to connect but the little thermometer module on my gantry was reading like 58 ish at 100 c bed temp, dropped to 56 ish overnight, was getting 40s before moving them to the front and actually setting up the automation macro for them.

For impromptu insulation, Cardboard works well too, I stick my filament dryer in a box during the winter so it can actually hit the target temps, otherwise it runs forever.

To be fair, I only find it needed on stuff above pla, and even then it's often good enough to preheat first, changed my start gcodes around to preheat before mesh levelling.

Not sure if creality has a macro to calibrate the z axis, totally possible there's a bit of skew across the x gantry, running the z axis just past its max usually sorts it on my franken-prusa, trying to adjust bed levelling with skew is a mess and made it look like the entire bed was going downhill.

What kind of probe? Are you preheating before auto levelling? Have you manually calibrated an offset? I used a sheet of paper which was good enough to rough it in and then fine tuned from there. Have you followed marlin's bed levelling steps? G29 S0 should return mesh results, plonk the reaults of that into a visualisation tool of your choice if you don't have the ability to visualise with your printer interface (klipper does and if I recall so does octoprint) to help see if you need further adjustment. Definitely do your mesh levelling at your expected print temperatures, give it a good heat soak of like at least 15 minutes before testing, preferably longer but good enough is usually fine.

How did you manually level? I ended up doing a silicone tube mod on my prusa to get the build plate as level as possible,

I did a student project for server room HVAC fans being annoying back in uni, targeted reduction in those annoying or peak frequencies was a totally acceptable outcome as to not disturb operators (was for a simulated patient in the attached hospital). I'm not an acoustic engineer, so obviously take what I'm saying with a grain of salt (did do a lot of safety and risk work though), making things less annoying is perfectly valid if they're not already harmful to your hearing in the first place.

What's cool to me is that it's just printable, so in theory super accessible and anyone could iterate on it if they desired (assuming it gets open sourced)