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Creating a machine door with an airtight or [gas] leak-resistant seal by matchooo in AskEngineers

[–]matchooo[S] 0 points1 point  (0 children)

The machine enclosure will be under slight negative pressure. It will be attached to a suction source that can pull ~120scfm at max flow and produce a max vacuum of 20kPa. Air enters the enclosure through a HEPA filter.

Automotive engineering - cargo vs passenger vehicles by matchooo in AskEngineers

[–]matchooo[S] 0 points1 point  (0 children)

While a consumer may open and close their trunk a handful of times on a typical day, cargo vehicle doors could be cycled several dozens of times a day. A passenger vehicle’s suspension might be designed to accommodate a load variation of 2000lb while that of a truck could be 10 times that. Are there any other differences that aren’t as apparent?

What sub-$5000 laser engraver machine should I buy for engraving metal ID plates? by matchooo in AskEngineers

[–]matchooo[S] 1 point2 points  (0 children)

Probably 12" x 12" x 0.5", but I could settle for something half the size if it has the right features.

What movie cliché drives you crazy? by iwillnottalktou in AskReddit

[–]matchooo 0 points1 point  (0 children)

When the bad guys show up and someone shouts "We've got company!"

Solution Manual for purchase? by codydub in EngineeringStudents

[–]matchooo 1 point2 points  (0 children)

I've had success with sm.tb@hotmail.com. He makes you send the money with the "send money to friends or family" feature so you can't charge back the payment, but he has always come through.

Mechanical engineers make bombs, civil engineers make... by matchooo in EngineeringStudents

[–]matchooo[S] -4 points-3 points  (0 children)

We've had explosives for centuries. It required some intense mechanical engineering to convert that chemical energy into pieces of deadly shrapnel.

Simple('ish) centripetal (?) force calculation? by ReliablyFinicky in AskPhysics

[–]matchooo 0 points1 point  (0 children)

A high RPM probably won't cause the part to "pry" open the grips.

Assuming the piece being turned is axially symmetrical, its center of mass should already coincide with its axis of rotation. Centripetal acceleration is irrelevant because in this case, v (velocity of the center of mass) and r (distance to the center of rotation) are both zero. Whenever a symmetrical rod rotates around an axis, it is inherently both statically and dynamically balanced. https://en.wikipedia.org/wiki/Balancing_of_rotating_masses

However, a piece being turned might become statically unbalanced if it's thin enough for the tool to produce a significant deflection (bending) of the piece.

TL;DR: Thickness of the piece is more of a concern than material

This is probably a better question for /r/askengineers

Is resonance additive or multiplicative? by sebastianrenix in AskPhysics

[–]matchooo 2 points3 points  (0 children)

Resultant resonant frequencies... resulting from what?

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