Watching heavy machinery never gets old.

Source: https://imgur.com/gallery/oil-quenching-y3oiCKG#/t/toolgifs

Source: https://imgur.com/gallery/drilling-blast-holes-q38DDXC#/t/toolgifs

I have an elderly dog with a broken leg. Back in late 2019 I started hiking down by the river with the dog and have continued to this day. However she broke her leg, and then had to have surgery to add a plate, she is still unable to walk much during the healing. So I purchased a garden cart to tote her with us (my wife and my dog), but the extra weight and the quick harness I made are starting to make it too difficult.

Currently I have two equal length leashes attached to a clip on the handle.

The leashes crisscross my chest like Sean Connery’s bandoliers.

I have been thinking about maybe some replacement backpack straps,

cross-posted from: https://rss.ponder.cat/post/104871

I'm fascinated by the youtube videos of "the spike" where circular waves can be used to create a pressure spike that asymptotes at the center, example: https://www.youtube.com/watch?v=iWKFPTgkpXo

In my mind, this makes sense for an essentially 2d scenario...but why can't it be expanded to 3d? Could you do this with gasses? Could you make some theoretical spherical chamber with, as an over-simplification, soccer-ball shaped pistons to create some asymptotically high pressure spike at the center? Could you modify parameters like piston extension distance, chamber radius, and temperature to create conditions to generate things like crystals found in the earth, like those industrial diamond making machines? Does creating asymptotically high pressures momentarily reduce the complexity of chambers needed to withstand those pressures, as the pressures near the outside would be much lower? Heck, could you create conditions wild enough at the center to bring things like fusion into range

Can someone help my man out?

cross-posted from: https://lemm.ee/post/47902662

First, I have no idea what some of these things are called or I think I know but I'm also second guessing myself the whole time. Also, I've never bought glass from anywhere but a local head-shop. For instance, this bong is almost 20yo. Please forgive me, if I apply incorrect nomenclature to any of the parts.

My bong's inner pipe, I think it's called a joint, broke several months back. I searched online shortly after but there were so many variables to consider that it kind of seemed overwhelming. I'm hoping there's someone within this community who has experience replacing a bongs' hardware. I have some measurements and images with the measurements included if anyone needs to see them. All of the measurements below are approximate mm -> inch conversions.

• Depth from rubber grommet to lowest part of chamber: 115 mm, 4.5 in
• Inner glass diameter (joint?): 14 mm, 0.5 in
• **Inner

In air. This seems like it should be incredibly basic information but I can't find it anywhere.

Terrible diagram 1

I'm trying to figure out how long to make A and B here if I have linear actuator of length C (extended = 2C) in order to tilt my panels from completely horizontal to vertical so they avoid wind and shed snow respectively when I run up the actuator to the extremes respectively based on sensor input.

Is there a simple formula I can use to plug the length of whatever actuator I settle on to figure A and B out? I know it will have to be a certain minimum and maximum size to work properly and might have to experiment to get an idea of what works in the end, but I'd like a reasonable start point to purchase an appropriate actuator.

I've googled around and decided I'm not smart enough to even come up with the right search criteria, let alone figure this out myself since it's been 35 years since I've used anything except the most basic trig.

This isn't really homework except for the fact that I'm trying to make my home work right.

E

Hello lemgineers!

I'm working on designing a claw that can be operated underwater. The plan is to use a linear actuator in a waterproof housing. The main issue is allowing the shaft to slide through without causing a leak. What's the best way to go about this?

Is there any mechanical engineers? What you would wish to know when you were starting learning? What skills and topics you consider the most useful in mechanical engineering?

What is the fastest way to learn mechanical engineering in the nowadays when 3d printers are avaliable to be able to design and make custom clocks, engines, generators?

cross-posted from: https://lemmy.crimedad.work/post/77168

Just build a replacement nuclear power plant and reuse the water. Right?

This is the second of two wind turbine posts inspired by this recent good news: https://slrpnk.net/post/7625300

This is the first of two wind turbine posts inspired by this recent good news: https://slrpnk.net/post/7625300

I just started getting interested in synchronous machines, and this channel really did it for me. Great for anyone studying engineering, or anyone interested with a high school/first year university physics background.

​We determine​d that the probable cause of the collapse of the Fern Hollow Bridge in Pittsburgh, Pennsylvania, was the failure of the transverse tie plate on the southwest leg of the bridge, a fracture-critical member (nonredundant steel tension member), due to corrosion and section loss resulting from the City of Pittsburgh’s failure to act on repeated maintenance and repair recommendations from inspection reports. Contributing to the collapse were the poor quality of inspections, the incomplete identification of the bridge’s fracture-critical members (nonredundant steel tension members), and the incorrect load rating calculations for the bridge. Also contributing to the collapse was insufficient oversight by the Pennsylvania Department of Transportation of the City of Pittsburgh’s bridge inspection program.

The full NTSB summary is here, along with links to more pictures and their full board meeting summary: [https://www.ntsb.gov/investigations/Pages/HWY22MH003.aspx](https://www.nt