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#sae

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I live in the US, and while I like metric, and a lot of what I work on or build these days involves metric hardware, I don't have a lot on hand. It's EXPENSIVE here. So, when occasionally I find these strings of sealed hardware in a thrift store, it's a treasure. I suspect they're parts kits from flatpack, freight damaged goods, and most times, they're all metric. I only paid a buck for this one (several bags already opened). What a treasure!
#maker #workshop #tools #hardware #metric #sae

US hardware standards are INSANE.
Working on a prop for my action-figure photo comic, "Minions at Work," and I want to attach some decorative lamp finials upside down as legs for a piece of furniture. Go to store, get some screws. Easy, right? A standard 1/4" screw is 20 pitch thread. But a lamp finial is 1/4" 27 pitch, for reasons that probably made sense to Tommy Edison. Can't find screws like I want, even online. (cont.)
#hardware #metric #SAE #screws #bolts #maker #diy #modelbuilding #makers

Drone warfare is surreal for those of us who participated in #SAE Aero Design or AIAA Design/Build/Fly in college. The whole time we thought we were built aircraft, we were actually building loitering munitions 😂 Also landing was pointless! #avgeek

Heads up: If you recently upgraded to wpa_supplicant v2.11 and are now having issues with your WiFi connection especially on broadcom based boards such as the Raspberry Pi, you might want to disable handshake offloading as follows:

"sudo modprobe brcmfmac feature_disable=0x82000"

If you can connect again, then add it to your bootloader / grub settings

For more details, see: bugzilla.redhat.com/show_bug.c

iwd.wiki.kernel.org/offloading

#WiFi#WPA3#SAE
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On page 5 they go on to write "it becomes apparent that LMDB confronts the map size limit, especially for value sizes
around 128 MB." Again this is false, there is no 128MB map size limit in LMDB.

Too bad the #SAE website doesn't provide any feedback mechanism for the papers it charges so much for. A high price to pay for such low quality technical content.

Continued thread

What is a Level 3-capable vehicle?

Put simply, per the #SAE #J3016 standard (which is not safety standard), this is a vehicle that is capable (by definition, not necessarily in practice) of detecting a certain amount of failures to the Dynamic Driving Task (DDT) within a certain Operational Design Domain (ODD).

With some exceptions, the human driver can (theoretically) remain inattentive to the performance of the DDT until the automated system demands that they regain operational control.

Continued thread

While one could go to the official #SAE website and download the #J3016 for free... I would highly recommend Professor Phil Koopman's "User Guide" which draws only from the standard and attempts to explain the dry technical language within in a more approachable way.

Professor Koopman does not at all pervert the standard language and has taken great pains to not do so, unlike many individuals and organizations scattered about on the Internet.

users.ece.cmu.edu/~koopman/j30

users.ece.cmu.edu SAE J3016 User Guide
Continued thread

Ok.

What are these "levels" everyone is talking about?

The original source of the levels is a standard published by the #SAE with the designation of #J3016.

The standard is entitled "Taxonomy and Definitions for Terms Related to Driving Automation Systems for On-Road Motor Vehicles".

Note that the title does not include the term "autonomy" which is found no where in the actual standard.

If you want to utilize "the levels" in conversation, this is the only place you should be drawing from.

The chart presented below claims that it is sourced from the #SAE and the #NHTSA, but...

**THE CHART IS WRONG!**

I took this from a "Tesla Twitter" exchange.

#Musk has staked much of #Tesla's future on the near-term success of their #FSDBeta program (however "success" is even defined)... so, naturally, there has always been an impulse on Twitter to "stretch" the capabilities of Autopilot and FSD Beta.

Let's take this apart because there are important public safety ramifications here.

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@takashioomoto Oof. Yeah.

But, truth be told, the #SAE #J3016 standard has been a mistake from the start, IMO.

What was *supposed* to be a broad taxonomy of automated driving features has been basically warped (understandably so) by marketing and the media to fit certain narratives.

Worse still, J3016 is not a safety standard and laypeople (again, understandably) attempt to cram it into some sort of safety argument.

We really just needed a safety standard - and not some arbitrary taxonomy.

Continued thread

There was a classroom for twenty or so students a bit further along and an office for the Teacher who wished to be known only as "Storm".

Am I having déjà vu or did I already write about this?
I will continue regardless.

The studio had a mat near the door, and when entered the floor would wobble as it was isolated from the traffic noise from the road below, that is to say, it was not directly connected to any part of the building, to stop noise from migrating through the structure and into the quiet studio.

Many years later a friend told me that the building had been demolished and they'd discovered that the studio was held in place by ropes over a beam, which somehow managed to hold the studio in place, despite being well under spec.

Unfortunately I found the class too heavy on theory and left after some months.

2/2

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@bhtooefr @Aminorjourney I think it is implicit. They're applying for #SAE certification of the standard. That's not going to happen without full protocol specification.

Interesting possibility about using #CCS protocol as the communications standard, though. Tesla should be able to handle dealing with that with #OTAUpdates. Most other #EVs couldn't.

Maybe we'll just see a portion of Supercharger stalls at each station get easily attachable /detachable CCS heads mounted to them.

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@bhtooefr @TheExecEditor Yeah, #Europe is already committed to #CCS Combo. No going back. But the US has no standard, and indeed, the lion's share of fast charger connectors are #NACS.

They said they're going to pursue "codifying it as a public standard", which I take to mean #SAE. Given that they've published the full technical specs, my assumption is it's "no catch". They stand to gain the most if it becomes the standard, after all.