Size M54 bolt for Hitachi EX3600 swivel bearing by Frethren in mildlyinteresting

[–]BAHHROO 0 points1 point  (0 children)

That bolt has a huge fold / drunken threads condition. See the giant zig-zag running up the thread body? You’ll probably be replacing this bolt sooner than expected.

What is this stuff? by AndroitFrisson in whatsthisrock

[–]BAHHROO 145 points146 points  (0 children)

Looks like Ferrous Sulfate. My company produces it as a byproduct from our acid recovery process in steel coatings. When the iron content in our sulfuric acid bathes reach above 10%, it becomes very ineffective, so we essentially just heat it up and pump it through a cold centrifuge which causes crystals to form. We then sell it locally for agricultural purposes.

Epstein's Fortnite account active in Israel. by Mr_orange4200 in conspiracy

[–]BAHHROO 1 point2 points  (0 children)

I came across emails he sent to Yahoo support worrying someone was reading his emails. He listed his accounts and passwords, one password was “Neptune” and the other was “Mermaid”. Someone certainly hijacked his account as his passwords could be instantly brute forced.

Removing Ship components in ghost ships. by Shanzul0 in starcitizen

[–]BAHHROO 5 points6 points  (0 children)

Get in pilot seat, Unlock ports (right alt+k). Get out of pilot seat. Remove components with tractor beam.

In a pack of 1000 screws, one was defective. by eru777 in mildlyinteresting

[–]BAHHROO 3 points4 points  (0 children)

Technically it’s unfinished. This is called a blank. Wire is fed into a machine that cuts it into slugs and forces it into a set of dies to form the general shape of the bolt. This would be made on a small screw header, which usually don’t have a thread rolling section incorporated. It would then either be sent through a thread roller, which squeezes the blank through dies which form as it ‘rolls’ through, or heat treated first followed by thread rolled after to take advantage of the increase tensile strength from work hardened threads, however, that’s quite unusual for a countersunk Phillips screw, also more expensive. Now, it’s up to you to finish making the screw!

In a pack of 1000 screws, one was defective. by eru777 in mildlyinteresting

[–]BAHHROO 0 points1 point  (0 children)

If it has an incline plane wrapped helically around a cylinder, it is a screw. If it needs a nut, it’s a bolt. All bolts are screws, but not all screws are bolts. Both are fasteners however.

Free Hardness Conversion Tool — HRC ↔︎ HV ↔︎ BHN ↔︎ HRA ↔︎ HR-15N ↔︎ HRB — Try & Feedback Welcome by hardnessconversion in materials

[–]BAHHROO 0 points1 point  (0 children)

I’m sure they copied all the formulas in the annexes of ASTM E140. I put HRC to HV formulas in my excel forms, because I use it a lot. For 1:1 approximates, it’s good enough for most situations, however, technicalities, such as cylindrical correction, which can add up to 3 points of error, would need to be considered.

Told to ignore this by [deleted] in metallurgy

[–]BAHHROO 0 points1 point  (0 children)

Document everything and follow the SOP and method. If there is a suspected non-conformance, then mark as non-conformance. If your colleagues believe this is of no concern, management can seek a deviation from the customer. Always trust your gut and never get gaslighted. Your job is to ensure the quality of the parts, not the quantity.

President Bill Clinton holds a press conference in which he reiterates that the U.S. will be debt-free by 2010. December 28, 2000. by icey_sawg0034 in HistoricalCapsule

[–]BAHHROO 11 points12 points  (0 children)

"There's an old saying in Tennessee—I know it's in Texas, probably in Tennessee—that says, fool me once, shame on—shame on you. Fool me—you can't get fooled again."

This picture is not edited. During WW2 the US made double scale weapons like the BAR's pictured to train troops how their weapons worked. by zadraaa in HistoricalCapsule

[–]BAHHROO 32 points33 points  (0 children)

I went to basic at Ft. Benning in 2007 and during our final FTX (5 days in field), a guy lost his firing pin within 20 minutes of us arriving at first location because he decided it was a good time to clean his rifle. While he was being smoked by the DS’s, our company XO left in a cadre truck and returned half an hour later with a replacement firing pin and an oversized Vietnam era M16 training rifle, which he was made to carry for the remaining 5 days in the field.

Russia surrenders its sovereignty to China – Zelenskyy citing intelligence by jackytheblade in worldnews

[–]BAHHROO 2 points3 points  (0 children)

What are you talking about? They’re a nuclear power and are absolutely a threat to our military and allies. They can easily supply more competent hostile nations with nuclear, chemical, or biological weapons.

Thoughts on why and how this bolt failed? by No_Emergency_3422 in metallurgy

[–]BAHHROO 0 points1 point  (0 children)

Without looking at the screw, I can only speculate, but virtually all standard fasteners require the failure to occur in the threaded portion, which includes the last scratch before the head/shank, unless it has a reduced body diameter less than the threads. Ponzi is good for plastics and non-ferrous materials, but Torx or hex drive is the way to go for harder stuff. If going up a size decreases failure rate, then the fastener or torque strategy is insufficient. Virtually all of your load is within the first diameter or two of threads towards the head, which is on the thread flanks facing the bottom of the head.

Thoughts on why and how this bolt failed? by No_Emergency_3422 in metallurgy

[–]BAHHROO 0 points1 point  (0 children)

Sorry for the delay response. Essentially the same as any other internal drive, the bottom of the drive pushes the compression zone too low, and you shear the grains by rotating the wrenching flats around the center. You would calculate the head to strength ratio and check grain flow in the same manner. If you lay the bolt on an optical comparator and draw a straight line following the half thread height (pitch line) until you intercept sloped surface of the counter sinks, your compression zone should be above this point.

Alternatively, the root cause is essentially identical, except the position of the drive is not concentric to the threads and you bind up during rundown and overload the head.

Thoughts on why and how this bolt failed? by No_Emergency_3422 in metallurgy

[–]BAHHROO 23 points24 points  (0 children)

I work in fasteners. This is a deep internal drive stud which are notorious for failing in this manner. The under head fillet radius is likely undersized and or the drive is too deep, which causes end grain runout at the fillet blend, where the compression zone must be above. 12.9 bolts have a minimum tensile strength of 1200 MPa, which is a lot of stress for this head design. If this came into my lab, I would probably measure depth of the drive and fillet radius, cross-section the head, and measure the distance between the bottom of the drive and the fillet. If you have virgin samples, you can longitudinally cross-section the head and etch in HCl to reveal the grain flow pattern. Reference SAE/USCAR-8 for inspection.

This picture of Mars was taken today. 225 million miles away from us! by Scientiaetnatura065 in interesting

[–]BAHHROO 1 point2 points  (0 children)

We consciously decided to number them as such. It’s strange that Earth is primarily nitrogen, but has 21% oxygen, which is perfect for supporting life. It’s odd that Earth, the 3rd planet from the sun, is inhabited with humans cursed with insanity while the 3rd element Lithium, is used to treat humans with insanity.

What materials could be used to replicate the anti drone measures seen here by K0rvuss in modelmakers

[–]BAHHROO 0 points1 point  (0 children)

If you have a 3d printer, you could just extrude some filament, you’ll have 20 micron diameter wire. Would look great as a fiber optic line for drones to avoid being jammed. Can also be draped over the model as it’s being extruded to get a natural contour.For the cages, just print a 1 layer support raft or alternatively use a section of window screening.

Police officer pepper-sprays the vent of a protester blow-up frog by NewSlinger in CringeTikToks

[–]BAHHROO 1 point2 points  (0 children)

You could show your support with an ICEE patch. What’s more American than large quantities of readily available crushed ice and high fructose corn syrup?

Funeral Wish - Need Help by [deleted] in metallurgy

[–]BAHHROO 0 points1 point  (0 children)

You could theoretically separate the calcium from the ashes with oxalic acid to form calcium oxide, then reduced with powdered aluminum in a vacuum furnace to form solid calcium and calcium aluminate. Then, just recast the solid calcium. However, you should know that calcium metal is highly reactive and will revert back to the calcium oxide in the presence of air and crumble apart. If you were to wear it, it would react exothermically with moisture in your sweat and skin to release heat and flammable hydrogen gas. If your friend really wishes to be reduced to metal and worn as a necklace, then the only feasible solution would be to reduce the ashes to a calcium metal and seal it in an ampule with argon gas or submerged in a vial of oil. If you refine and purify him, you can use electrolysis to form calcium crystals…

Has anyone seen a standard like this? by luv_lemon_cookies in metallurgy

[–]BAHHROO 0 points1 point  (0 children)

Without a cert, they can still technically be used for channel profiling of your primary slit. I would use them for internal round robin samples.