Ned ‘Jonathan’ Schofield
@urlyman@mastodon.social  ·  activity timestamp 3 days ago

“the Romans built cranes with a mechanical advantage of up to 70 to one, meaning that one man exerting a force of only 25 kg could raise a weight of 1.75 tonnes.

However, the hydraulic version of the lever has one outstanding advantage over earlier mechanisms … the possible multiplication ratio is almost infintely greater and both pistons may be a considerable distance apart — up to about 25 km”
https://mstdn.social/@markhburton/114856001920894810
Susi Arnott
@SusiArnott@mastodon.green  ·  activity timestamp 3 days ago
@urlyman - thanks for marvellous link, had only thought of #waterpower in re gravity (and cf Malm's 'Fossil Capital')
#engineering and ping @CrispinHughes
Mark Wyner Won’t Comply :vm:
@markwyner@mas.to  ·  activity timestamp 2 weeks ago

In my journey to continue to find the good things in a world that’s breaking my heart on the daily, I found some beautifully-serene art.

Kinetic artist, Reuben Margolin uses skills in design, engineering, physics, electronics, and more. He creates motorized pieces that seem impossible. The one is called “Interlaced.”

More:
https://www.reubenmargolin.com/

#Art#Engineering#Physics#Math#KineticArt#Sculpture#Artist#ReubenMargolin#Mechanical

A horizontal set of tall polished wooden planks that are arranged tightly together. Vertical wires pull them up and down in a pattern that makes them look like two sets of waves, gracefully dancing together. Then the shot zooms out to show the complicated array of gears and pulleys above them.
A horizontal set of tall polished wooden planks that are arranged tightly together. Vertical wires pull them up and down in a pattern that makes them look like two sets of waves, gracefully dancing together. Then the shot zooms out to show the complicated array of gears and pulleys above them.
Mark Wyner Won’t Comply :vm:
@markwyner@mas.to  ·  activity timestamp 3 weeks ago

Need a quick laugh to distract you from the horrors of the world? Just for a minute? I got you.

I tried to find out who made this. I failed. If someone knows, please let me know so I can update with a name and/or link.

(Update: @picture_of_the_day found the source: https://sts-3d.com/ 🙌🏻)

#Design#Engineering#Products#Robotics#AI#Humor#Funny

A dishwasher completely obliterating dishes. The first shot shows a stack of dishes on the open door. The motor sound is the agitator spinning with water flowing onto it. The door slams shut and all of the dishes explode inside the machine. The unit is free-standing on two robotic legs that make it hop up and down. The door keeps opening and closing, and the cameras switch from outside studio shots to inside the washer itself. During the distorted audio, dishes are being smashed to pieces. During the segment about the automatic door actuation, the washer is still running while the door opens. Many dishes are catapulted out of the machine, while some others bounce around inside, caught up in the agitator and rack. During the segment about the project being under development, an array of forks are shown, lined up on a table, completely bent up and distorted. At the end, two men are physically testing the machine. One is sitting on top of the machine while it bounces, and then they are testing its structure by pounding on its shell.
A dishwasher completely obliterating dishes. The first shot shows a stack of dishes on the open door. The motor sound is the agitator spinning with water flowing onto it. The door slams shut and all of the dishes explode inside the machine. The unit is free-standing on two robotic legs that make it hop up and down. The door keeps opening and closing, and the cameras switch from outside studio shots to inside the washer itself. During the distorted audio, dishes are being smashed to pieces. During the segment about the automatic door actuation, the washer is still running while the door opens. Many dishes are catapulted out of the machine, while some others bounce around inside, caught up in the agitator and rack. During the segment about the project being under development, an array of forks are shown, lined up on a table, completely bent up and distorted. At the end, two men are physically testing the machine. One is sitting on top of the machine while it bounces, and then they are testing its structure by pounding on its shell.
screwlisp
@screwlisp@gamerplus.org  ·  activity timestamp 2 months ago
#programming #engineering #lisp #lispygopherclimatehttps://communitymedia.video/w/fDRrC8N2WFCecGpEuQx3on 0UTC Wednesdays

No Edrx (https://anggtwu.net/) again, but I will read a note from him about his own type theory quest.

He speaks to some of the different meanings that appear when different people say the words type theory, as appear on the Mastodon recently!

Also, I got a lot of notes on obvious improvements and contex for my https://screwlisp.small-web.org/ articles so far which we can share and talk about!
Eva Winterschön
@winterschon@mastodon.bsd.cafe  ·  activity timestamp 3 months ago

💻 FreeBSD CUDA drm-61-kmod 💻

"Just going to test the current pkg driver, this will only take a second...", the old refrain goes. Surely, it will not punt away an hour or so of messing about in loader.conf on this EPYC system...

- Here are some notes to back-track a botched/crashing driver kernel panic situation.
- Standard stuff, nothing new over the years here with loader prompt.
- A few directives are specific to this system, though may provide a useful general reference.
- The server has an integrated GPU in addition to nvidia pcie, so a module blacklist for the "amdgpu" driver is necessary (EPYC 4564P).

Step 1: during boot-up, "exit to loader prompt"
Step 2: set/unset the values as needed at the loader prompt

unset nvidia_load
unset nvidia_modeset_load
unset hw.nvidiadrm.modeset
set module_blacklist=amdgpu,nvidia,nvidia_modeset
set machdep.hyperthreading_intr_allowed=0
set verbose_loading=YES
set boot_verbose=YES
set acpi_dsdt_load=YES
set audit_event_load=YES
kern.consmsgbuf_size=1048576
set loader_menu_title=waffenschwester
boot

Step 3: login to standard tty shell
Step 4: edit /boot/loader.conf (and maybe .local)
Step 5: edit /etc/rc.conf (and maybe .local)
Step 6: debug the vast output from kern.consmsgbuf logs

#freebsd #nvidia #cuda #gpu #engineering #terminal #saturday