CAD and the Jeston Nano

Posted by: @robo-pi

I got the message: Blender is not available for this architecture (arm64), but is available for (amd64).

So apparently it won't run on the Jetson Nano.

That's strange.  I wonder why version 2.79 runs on arm64?

Yeah, that's why I said you should check.

I'm not sure it's about architecture, as I thought it was more to do with the graphics capability.

Certainly, 2.79 will do a lot, just a little more clunky and outdated, that's all! 🙂

@robo-pi and @frogandtoad

I'm going to have to go along with James on this as I ran across this same problem of trying to make this conversion from mils to mm and back.  I read a good explanation of the relationship of the mil, which stated it was 0.001 inches, to the metric system, but danged if I can find it now,  But I'll keep looking.

In reference to tool making I can see where "shaving" a few "mills" off of a part would mean a few millimeters, but notice I used two "l's" instead of one.  The two spoken words would be pronounced the same, but spelled differently.  Just my 2 cents worth.

Posted by: @codecage

In reference to tool making I can see where "shaving" a few "mills" off of a part would mean a few millimeters, but notice I used two "l's" instead of one.  The two spoken words would be pronounced the same, but spelled differently.  Just my 2 cents worth.

 

Not just Toolmaking, but the engineering trade in general, as well as others.

Indeed, one 'l' vs 2 'l''s matters when it's written as such, but that is never written and always verbal.  If it actually was in writing, the drawing would then stipulate the correct and well known SI standard of  'mm', following the Metric number.

@frogandtoad, @codecage

This an ambiguous topic, I have spent the last thirty years working as an inspector in the oil, gas & petrochemical industry, and the terminology "mils/mills" has always been a contentious issue.

When working for US engineering companies, tolerances in "mils", were always deemed to be, as @codecage explains, 0.001", which also applies to the UK sometimes. And on mainland Europe, where Imperial units are largely foreign, "mills" are just an English short form (slang) for millimetres. English being the standard contractual language for European companies supplying to the oil, gas & petrochemical industry.

@pugwash

That's the problem... the verbal slang spoken term doesn't describe the number of 'l''s in the name, and that alias or slang, or short verbal term is mostly and imo, reserved and better known to refer to the SI unit of the "Millimetre".

I did a search, and was unable to find "mils" in any ANSI, SI, etc... standard list so far?

I can also say with confidence, that no book on engineering during my first apprenticeship and subsequent post apprenticeship studies, including CAD/CAM and others outside the study of engineering, ever used the unit "mils" in any way shape or form.

It's unfortunate there are two "verbal" types of "mil(l)s", and that is the problem - I'd be very surprised if I asked someone to take a mil(l) off a component for me, that they would think I meant 1 thou.  Maybe it's different in the states, but here in Australia... language like that would cause a lot of scrap 🙂

@frogandtoad

Had a peek into my book of ASTM standards and found no mention of "mils", but a lot of metric inches.

My guess is that a lot of backyard engineering shops, especially around the oilfields of Texas, just use "mils" as a slang word for one-thousandth of an inch, which is tongue twister in itself.

American and some Canadian engineering shops are not particularly fond of metric units.

Back in the nineties, I worked for Mitsubishi Heavy Industries in Ontario, MHI were building and engineering a galvanising plant for AK Steel, in Indiana.

The drawings arrived in Canada from Hiroshima in metric, the engineering shop then revised them all to imperial. After construction and quality control, the as-builts were submitted to MHIA in imperial, who converted them back to metric for Hiroshima, who then converted them back to imperial for AK Steel.

This was what we Brits justifiably call "a right pig's knickers"! ? ? 

@frogandtoad

I live in Pennsylvania USA.  Every machine shop I ever worked in spoke in "thou" I never heard anyone refer to a thou as a mil.   So I would need to ask if someone told me to remove 1 mil.   In fact, I'd probably think they were talking about a millionth of an inch and were just joking around.

@codecage

I completely redrew the schematic for the SD Card Boot Hub.    It's exactly the same wiring as before, just a fresh new schematic drawing arranged differently.   I also added some net names so they'll show up in the PCB  editor.   I drew the schematic up more in line with how the PCB is laid out.   I think it looks a little cleaner.  I also want to get into the  habit of trying to draw up new schematics with the PCB layout in mind.

Here's the new schematic:

@pugwash

Posted by: @pugwash

American and some Canadian engineering shops are not particularly fond of metric units.

Yes, I'm well aware of the lack of "especially" American uptake of the metric system, even though they adopted it a long long time ago, they mostly prefer to stick with imperial.  It doesn't really bother me to be honest, I am absolutely fluent and comfortable using either unit of measurement, as I have always used both units throughout my career interchangeably.

@robo-pi

I think "thou" is also basically engineering slang. I have never seen it written down in any engineering spec that I have had the displeasure to read!

@frogandtoad

I also worked on equipment for Australia's biggest and I believe most expensive "white elephant".

Can you guess what it was??

@pugwash

Um... desal?

@robo-pi

I have got a question for you about Blender!

I have had it installed for a few years but have never bothered with it. Now that you have woken my interest again, I watched a few YouTube videos on the fundamentals of using the program.

But at the moment I can't really see how it would be of any use, so I was wondering what you intend to do with Blender once you've got it up and running?

And what if any long term plans do you have for it?

@frogandtoad

BHP Direct Reduced Iron Plant in Port Hedland.

Cost in excess of 2.5 billion Aussie dollars and has been mothballed since it was built. Built by joint venture of Voest Alpine and BHP.

@pugwash

We seem to have a history of building these kinds of projects.

The desalination plant built in Victoria cost the worth of a small country, and costs $1,000,000 per day to sit idle since it was built.  Turned it on once to test it, and the second time it failed... and hasn't been started up again as far as I know, yet they keep talking about creating X gigalitres for times of need.

Last week talk of building another one was said to be not out of the question, yet Queensland is in serious drought, rivers have run dry and water sold off to foreign interests!

Stupid politicians!

@frogandtoad

Every major project has its funny side!

Did you know that BHP forked out 5M Aussie dollars to soundproof the south-east side of the DRI. The problem was that the plant backed on to Aboriginal land, and what if a native Australian with spear came wandering by once a month. So the government insisted it was soundproofed.

When I was working on the Eurotunnel, in the office next door was a team of French engineers designing what was affectionally known as the "rat trap". Officially called the Rabies Prevention System. This was designed and installed at a cost of well over 1 M pounds, but never turned on! The safety authority banned that, because they said if ever a train had to be evacuated it would probably kill a little old lady with a pacemaker who stepped on it.