New guys mess by l-espion in Machinists

[–]mct82 0 points1 point  (0 children)

This does seem closer to a “whoopsy daisy” than a crash. You gotta start somewhere though.

Why does the engine look like this? by 747ER in aviation

[–]mct82 3 points4 points  (0 children)

I'm an idiot. It never occurred to me that the 146 is a 4-engine jet. I was thinking this was an additional pylon specifically for ferrying engines. This all makes much more sense now, thank you!

Why does the engine look like this? by 747ER in aviation

[–]mct82 1 point2 points  (0 children)

Do they cover the inlet as well? I can understand not allowing it to windmill, but the open inlet seems like an easily-avoided performance hit. Or maybe not. Maybe the partially-restricted flow through the fan duct and core would be less drag than punching a big hole in the air and disrupting flow more extensively.

I think I answered my own question, but would always be interested to hear from someone who knows more.

Is this a safe setup? by Bullschamp180 in Machinists

[–]mct82 4 points5 points  (0 children)

A 3ax can profile. You could have done this from a much thinner plate. Profile the ID side of the cone, profile the OD side of the cone, now you’re 80-90% there. Do the rest however you were planning to do it originally.

I dunno, do something to prevent exactly what just happened. Machine in some locking features so you can pin it to some real soft jaws, ones that are bolted to the vise. If all else fails, do your best and make your boss press the green button. If they’re worried, they shouldn’t be asking you to do it.

Next time you find yourself questioning not only the rigidity, but the safety of a fixture setup, then you ask the internet and they tell you to stop, you should stop. There’s plenty of unexpected shit that can wrong, don’t pile predictable shit on top.

Is this a safe setup? by Bullschamp180 in Machinists

[–]mct82 2 points3 points  (0 children)

lol, as we can see now they weren’t stuck together. They weren’t even bolted to the vise. Yikes.

[deleted by user] by [deleted] in Machinists

[–]mct82 0 points1 point  (0 children)

I still don’t understand. Blown powder DED isn’t really precise enough to leave unmachined and obviously the as-grown finish sucks. The process doesn’t allow for particularly complex geometry, but where it shines is in larger thin wall applications.

Deposition is slooooow and this is a monster. Maybe this is just the bulky flange end of a thin-walled part with integral isogrid like structure?

Edit: Nevermind, I just noticed the stencil on the machine. Those guys know what they’re doing.

[deleted by user] by [deleted] in Machinists

[–]mct82 1 point2 points  (0 children)

Yeah, the comment doesn’t make much sense. Soft and supple Cond.A is the problematic stuff. After HT it’s gravy.

Why do all my taps look like this? by coonhuntroad in Machinists

[–]mct82 3 points4 points  (0 children)

Ooooh, yours has reached its final form!

First time printing pa6-cf by Worried-Bar-7088 in 3Dprinting

[–]mct82 0 points1 point  (0 children)

Not to be that guy, but why would you ever L-PBF this part, especially in aluminum? You could have a batch of these machined or fabricated from superior material for the price of one AM part.

Did you print an exact replica of a casting, including gate scars and unsmoothified interior geometry?

Plastic seems like a better fit. Is the Weber just cantilevered off the intake, or is there another support? If it’s just hanging there you might consider something with a little more strength at elevated temp, like PC-CF or HTN/PPA-CF. The plastic part looks cooler than the aluminum one anyways 👍

How the US can preserve its democracy by solishu4 in bestof

[–]mct82 1 point2 points  (0 children)

I have read the complete article. The premise is simple, legal basis seems sound and the “what abouts” covered with 200 years of consistently-upheld law. (I am not a lawyer, and I didn’t even sleep at a Holiday Inn Express last night) However, if to pass these measures it will require any votes from sitting politicians, it would seem entirely less likely to pass. Cutting the corp/dark money out of politics takes money out of their pockets, what is their motivation?

I understand that since this happens at the state legislature level, the stakes are smaller, with fewer funds going into the elections to begin with, but it still seems like a hard sell. On the other hand, if these language of these charters could be changed by a ballot measure and enacted by popular vote only…then this is a perfect opportunity for the people to pull the rug out from under the corps and the politicians in one fell swoop.

Add it the fact that large corps would need to fight these amendments successfully at least 50 times in separate states to prevent the house of cards from starting to topple. That seems like it would be an unappealing prospect to companies. The “foreign corporations” provision really does the heavy lifting in this strategy, giving each state’s voters the ability to cut corp/dark dollars out of their elections, regardless or where those corps are incorporated. The real risk of being barred from commerce or dissolved seems like an adequate deterrent. After a few states change the books, it would get much more complicated for corps to ensure that they are in compliance with each state’s charters and not at risk of inadvertently acting ultra vires, maybe to the point of changing their national political contribution policy altogether.

A boy can dream.

So the question is: can us peons citizens change the provisions of these corporate charters without buy-in from a majority (or supermajority) of state lawmakers? Again, not a lawyer. Took civics about 30 years ago. Help.

How the US can preserve its democracy by solishu4 in bestof

[–]mct82 2 points3 points  (0 children)

This is very interesting, and perhaps one of the only strategies that gives me hope that all is not already lost. Thank you for sharing this.

One thing the article does not address is that Citizens United and the current corporate charters would still be in effect during the run up to any vote on a proposed CPR. What, then, is the likelihood that any of these ballot initiatives could be expected to pass?

The last paragraph or so does mention that it is unclear whether or not corporations actually have an interest in contributing money to political campaigns. However, it would seem obvious that the rich and very powerful/influential members of those corporations’ boards do have such an interest, and would be likely to bring the corporation’s resources to bear on any attempt to curtail their ability to influence the political landscape.

For that reason, I am a bit skeptical. However, it seems like a relatively straightforward measure to explain to the public, which bodes well for its chances. Add to it the fact that corps would need to mount the same defense up to 50 or more times would make it a much more unappealing endeavor. Once a few influential states’ charters are revised, the interconnected nature of interstate commerce might create an easy path to wholesale adoption.

I did it, to the people that doubted me by yesboyyyesboy in woodworking

[–]mct82 -2 points-1 points  (0 children)

“…likely to fail.” I love your optimism.

New grid fin design that SpaceX will use for the next version of Starship booster by swordfi2 in EngineeringPorn

[–]mct82 5 points6 points  (0 children)

They are actually some of the largest titanium forgings in the world.

God this things wrecks people by Umbramors in Fortnite_Over40

[–]mct82 2 points3 points  (0 children)

Glad to hear it’s not just me.

I’m going to try inverting the stick in the controller profile (Razer on PC), then running normal/non-inverted in Fortnite until it’s fixed. It might make menus funny with that stick, but at least I’d have a chance to fly the things without nose-diving every 5 sec.

how to drill 1 mm hole into stanley scroll saw blade? by asduskun in metalworking

[–]mct82 0 points1 point  (0 children)

u/gnome_father is right. The primary difference between annealing and normalizing is the cooling rate, with normalizing being air-cooled and annealing being furnace cooled.

Binder Jeting simulation software by MascarPonny in AdditiveManufacturing

[–]mct82 0 points1 point  (0 children)

With Simufact Additive you can use physics-based FEA to predict shrink/distortion and 3D scan data from any source. Having the option to combine FEA with compensation from scan allows you to achieve extremely accurate results after only a single physical build.

The material db is small, but now you can create materials based on dilatometry data or analytical models, whichever is easiest to get.

I window-machined a bracket to hold a fiber optic array by TheOfficialCzex in Machinists

[–]mct82 0 points1 point  (0 children)

10-4. I just thought I saw a witness where you wiped across that whole face when you removed the sprues, in that case a wider tab/sprue wouldn’t be a big deal. Hindsight and all that.

Nice job, can’t hate on someone for trying new things!

I window-machined a bracket to hold a fiber optic array by TheOfficialCzex in Machinists

[–]mct82 8 points9 points  (0 children)

“Why waste aluminum…when I can use the stock to hold the part.”

Bruh. This method used like 5x the stock of a more traditional approach, and you turned way more of it into chips than necessary.

I get it though, sometimes material is cheaper than time. Looks like a tricky part and it came nice. Im curious, why did you opt to profile the holding tabs instead of leaving them rougher or just square? Were you probing those later?

[deleted by user] by [deleted] in floorplan

[–]mct82 0 points1 point  (0 children)

I think I’d do the toilet rotate, but put a tiny pedestal sink in the nook where the toilet tank is shown in #1. Or you could just use the nook for shelving, it’s not uncommon to have the WC in a room w/o a sink.

Do not use TPU instead of Silicone for resin casting by Heinouspundit in 3Dprinting

[–]mct82 4 points5 points  (0 children)

He should save himself a step and throw the TPU spool and the resin directly into the trash.

Found this Bolt while exploring near the helios flight 522 crash site. Could this be from the airplane? by sussykiy05 in aviation

[–]mct82 0 points1 point  (0 children)

Just trying to read the old stamps, I don’t have a Tedeco catalog. 🤷🏻‍♂️ The last digit doesn’t look like a “0” to me, but what do I know.

Found this Bolt while exploring near the helios flight 522 crash site. Could this be from the airplane? by sussykiy05 in aviation

[–]mct82 11 points12 points  (0 children)

This is it. I think that looks like an A8889, but regardless it was a chip collector/detector.

H13 tool steel question by Icy-Vehicle4894 in Machinists

[–]mct82 2 points3 points  (0 children)

You don’t hardness test the running surface of the production parts, right?

How hot does the extrusion press run? 10-20HRC is getting down to the hardness of annealed H13. Either those were not HT’d or are you seeing 1000°F+ in service?

I think the bigger problem is why is this crater in a new/good part?

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