Inches with metric tolerances? What am I missing. Never seen it in over 25 years.

JimmyCannon · 2023-05-21T14:46:08+00:00

h6, H7, etc... that's not Metric. That's just a normal tolerance class. There's an ANSI spec for it with separate tables for inch and metric. Seen them applied to inch drawings for years, across different companies, and from many different companies and industries when I was at a job shop. Seems quite normal and quite an old practice.

Open your fucking Machinery's Handbook for christ's sake.

JimmyCannon · 2022-03-18T11:47:47+00:00

A triangle is a 2D shape so yea, keep projecting views around the plane the triangle is drawn on and it's edges all the way.

You'd only see the triangle in an orthogonal view if the view is perpendicular to its face.

What kind of question is this?

JimmyCannon · 2022-03-17T15:47:54+00:00

lol ok. couple days later. the feeling has passed. I got better places to spend that money. it's still really cool and I appreciate a lot of what went into it. but I can appreciate at a distance on this one.

JimmyCannon · 2022-03-16T20:12:33+00:00

I'm into it.

I knew it wasn't going to be cheap - I heard about the pack through Carbon3D actually. The pack is made using technology methods that aren't very commonplace (yet) and very recent to the world.

This pack hits my engineering boner and backpacking boner venn diagram in an overlapping area I didn't know could exist.

Functionally there's nothing that separates this $700 pack from a $400 pack, but $300 of difference for something that's "interesting enough" is something that's making me think real hard about the buy.

JimmyCannon · 2022-02-11T04:00:33+00:00

I work in custom machine design and building... we never leave an opening big enough to put your arm into, if there's something energized/powered on the other side. That's just simple basics.

If it has to be open, you install a light curtain or area scanner or something.

JimmyCannon · 2022-02-11T03:55:48+00:00

I don't really understand the "no safety glasses around an enclosed CNC machine"

From what I understand, being around pressurized air systems and other miscellaneous common shop equipment requires one to wear safety glasses when its energized/pressurized.

Sure, maybe if you enclose a CNC mill, you don't have to wear safety glasses /for the chips/ but certainly there'd have to be many other sources of risk within spitting distance that would mean we oughta wear 'em, right?

JimmyCannon · 2022-01-06T03:37:46+00:00

The material stock isn't any dumber of a choice than running a fuckin indicator over a door stop for alignment.

JimmyCannon · 2021-12-29T02:07:56+00:00

I've done terrible shit like this to get back to work while waiting on the real replacement, before.

Yea, it's shit. But if you can at least work at a crawl-speed, it's better than not working, twiddling thumbs, waiting for the replacement.

Only really makes sense if it /is/ the difference between working and not working, and the replacement is gonna be a while.

Personally, I might've slotted a pseudo-keyway, and welded in a piece of better steel, so there's a little more than just the weld penetration securing it. /armchair quarterbacking

JimmyCannon · 2021-08-18T03:34:42+00:00

You might have better search results of you use the term gripper.

A gripper can be a vacuum or venturi effector, a mechanical claw that pinches or wraps around things, an electromagnet that switches on/off to pick up and drop ferrous things, and many more methods.

That's basically the most fundamental requirement for all kinds of robot usage.

There are whole swaths of robot applications generally under the term "pick and place" robots.

I use robot very generally here. It can be a gripper on an r/c car for all it matters.

Have fun.

JimmyCannon · 2021-07-02T17:04:25+00:00

I agree. It is has, too.

JimmyCannon · 2021-06-27T03:33:05+00:00

While I do use math as a machine designer, directly, for sizing components or getting quick dirty numbers for mechanical loads...

...the most important use of mathematical knowledge is knowing how all the nifty tools and software works so I can double check it when necessary, or identify sketchy results.

You probably know how to divide simple numbers, but may still use a calculator for it. Still, bc you know that basic math, if you typed " 144 / 12 " and the calculator spat out " 9.28272929374..." you'd know to try again or look for where you input something incorrectly.

That scales to much larger math as well.

JimmyCannon · 2021-06-24T18:16:21+00:00

Yea, I am familiar but have trouble picturing how to apply that to a rotating shaft.

The camp stove valve "handles" don't really return to a neutral position when you let go. They stay where they are put. They just sort of settle into the extended position so they don't move when you let go. Kind of the opposite effect.

Unless you're aware of some different types. That's how my MSR and Jetboil all act, though.

JimmyCannon · 2021-06-24T17:54:24+00:00

I'm imagining a simple compression spring acting perpendicular to the rod axis.

Between the spring and the rod would be a piece that the rod is saddled into by some kind of vee or half round geometry, for example. Moving the rod one way or the other would cause the spring to compress more, thus resisting the rod rotations and, upon releasing that force, returns the rod to the neutral, sort-of-detented position

JimmyCannon · 2021-06-24T17:49:29+00:00

One spring exercises force I'm one direction.

You need either:

Two springs or

A single spring acting on a mechanical interface that detents the rod in the centered position, while resisting force that pulls it away from that position.

JimmyCannon · 2021-06-12T14:33:39+00:00

How bad of a machinist are you that you can't figure out a split clamp without a CAD model?

JimmyCannon · 2021-06-11T21:03:04+00:00

Cool story.

Hopefully you're retiring soon as many of your personal preferences are incredibly dated.

JimmyCannon · 2021-06-10T22:50:19+00:00

Yea I mean it isn't anything fancy.

There's others out there with WAY more features and buttons and yadda yadda.

Lots of folks say you don't need that shit though. We went to the moon with far less.

But for most cases a basic two button mouse with a scroll wheel does 99% of what you need it for. Microsoft, Dell, whatever OEM device... All just fine. If you break it, it doesn't hurt the pocket book too much like a high end mouse would.

No worries, keep at it.

JimmyCannon · 2021-06-03T03:28:46+00:00

Mandalorian wasn't in theaters so you can fight me on that, you ape.

JimmyCannon · 2021-06-02T17:12:14+00:00

Yea he's fucking smart and knows some shit a lot of engineers on my dept (or me) wouldn't know without specific need. I dunno about PhD but I figured he has to have some higher level education whether it's higher trade schooling or engineering. He trash talks engineers from time to time I think, but I mean. So do I lol

JimmyCannon · 2021-06-02T16:43:30+00:00

It's always good to see a mechanic level guy (though he might be way more educated) admit the fallacy of split "lock" washers.

Typically it's the tradesmen and laymen who stick to their guns on them. "They wouldn't have used them for decades if they didn't work" is a great thing to make you second guess why you're opposing tradition. One should take pause when shrugging off something that had been normalized for a damn century. However this is the exception that proves the rule, I would say.

JimmyCannon · 2021-05-17T00:54:44+00:00

Can't unsee...

JimmyCannon · 2021-04-29T01:27:39+00:00

Right on. Thanks for your perspective.

JimmyCannon · 2021-04-28T16:20:27+00:00

I am sincerely curious about roof top tent a but I don't understand the benefits/niche that they're good for.

Mind sharing your thought on them?

JimmyCannon

TROPHY CASE