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6 votes
Accepted

Nuclear weapon doubts

Electronics in today's sense didn't exist. The implosion explosives used a special sort of squib designed at Los Alamos. https://en.wikipedia.org/wiki/Exploding-bridgewire_detonator. There was a ...
Phil Sweet's user avatar
  • 4,765
4 votes

How are springs that are designed for 100% extension different for ones that are designed for 60% extension?

For a given free length and spring rate there are an infinite number of designs of coil spring. However, there are many practical limitations that limit the options. A spring with a few coils, of thin ...
Greg Locock's user avatar
4 votes

Why do two simply supported beams stacked on top of each other deflect more than a single beam of twice the thickness?

Why do two simply supported beams stacked on top of each other deflect more than a single beam of twice the thickness? Because the mating surfaces slide. The result is that you don't have the same ...
Transistor's user avatar
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4 votes
Accepted

Lead screw alternative with smooth rod clamped by inclined bearings?

You seem to be referring to this variation of ball screw where a smooth rod is used, instead of a lead screw. It is (apparently) called a threadless ballscrew. From Threadless ballscrew for 3D printer:...
Greenonline's user avatar
3 votes
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Relationship between how fast a metal cylinder can spin on its axis without breaking or deforming?

For a thin spinning disk ignoring the frictions, such as air friction, there are two stresses, radial and hoop stress. Both must be below the accepted stress limit of the material. We assume no ...
kamran's user avatar
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3 votes

Why is stress the same even if I change the material?

Oh for goodness sake, this is statics 101. The stress in a beam in bending in the linear range is M/I=sigma/y There are no material properties in that equation.
Greg Locock's user avatar
3 votes

Will natural gas or propane generators also run on methane?

The average low heating value (LHV) of biogas is around 5.5 kWh/m³ for a methane % around 40-70%, and Propane has around 24.2 kWh/m³ of LHV, and the Natural gas (NG) has around 10 kWh/m³. Gas LHV ...
Victor Sena's user avatar
3 votes

Nuclear weapon doubts

None of those old designs still exist. All of them are long obsolete and have been decommissioned: removed from service and disassembled so the plutonium components could be salvaged and reprocessed ...
niels nielsen's user avatar
3 votes
Accepted

Controlled oscillation of a piano string by electromagnetic, mechanical, or other means

What you describe has been on the market for over 40 years for electric guitar use; it is called an E-Bow. It contains a sense coil, a drive coil, a battery, and an amplifier circuit inside a case you ...
niels nielsen's user avatar
3 votes
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How do mechanical engineers, in practice, account for drag/air resistance when designing machines?

In many cases, probably a majority, they ignore air drag, and simply design the torque capability of the engine as enough to deliver the required output, plus some sizable margin to overcome sources ...
RC_23's user avatar
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3 votes
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Elongation before plastic deformation

Elongation at yield and elongation at failure aren't correlated for such broad material descriptions; one could have a strong but brittle alloy in which the former parameter is notably large but the ...
Chemomechanics's user avatar
3 votes

Where do engineers find the manufacturing processes of objects?

I can't read your instructor's mind, so I can't be sure this is what they intend, but: the fact you've been asked to disassemble the object suggests to me that you're expected to look for physical ...
Daniel Hatton's user avatar
3 votes

Where do engineers find the manufacturing processes of objects?

Take the object fully apart. Inspect each component and consider it. Is it standardized like a screw or gear? If that's the case internet search to see how those are made. Done. Even for parts that ...
Drew's user avatar
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3 votes
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How do lifts remain steady as passengers embark/disembark?

First of there will be many cables going through pulleys which increases the effective young's modulus of the suspension mechanism. This will reduce the tendency of the cabin to move as weight is ...
ratchet freak's user avatar
3 votes

How did mechanical punched tape readers work?

The original punchcard mechanism as used on looms they pushed a set of rods through the card. A weak enough spring will allow the rod to push against the card without damaging it. And then a simple ...
ratchet freak's user avatar
3 votes

How did mechanical punched tape readers work?

Back in 1974, 50 years ago, my high school had a couple of Model 33 teletypes (teleprinters) connected to a DEC PDP 11/70 computer. The paper tape readers they had were mechanical ones which fingers, ...
Fred's user avatar
  • 9,702
2 votes

Why do race cars — such as Formula 1 cars — use two brake master cylinders?

It is so that balance can be adjusted between the front and rear brakes more easily, often times by the driver as he races. In a regular street car, there is a proportioning valve that determines how ...
Alfred Lord Tenniscourt's user avatar
2 votes

A question on understanding the nature of static equilibrium

In Engineering, we are usually not concerned with the detailed molecular level of material behavior. That is the job of material scientists and engineers. We assume a point load on a slab or on top ...
kamran's user avatar
  • 22.5k
2 votes

What are these flat surfaces on a worm gear's teeth for?

the curve in the tooth is to clear the minor diameter of the worm gear so the worm and the tooth can engage fully.
niels nielsen's user avatar
2 votes

How to connect 2 input shafts which will work independently to an output shaft

Yes, the motors drive hydraulic pumps as input, output is from a hydraulic motor - if swash plate ones are chosen then input and output can be controlled from zero to max. a differential can be used ...
Solar Mike's user avatar
  • 15.9k
2 votes

How are springs that are designed for 100% extension different for ones that are designed for 60% extension?

The ratio of the spring diameter to the wire diameter is the primary factor.
Phil Sweet's user avatar
  • 4,765
2 votes

Why do all high-speed trains run on electric track (as opposed to normal track with diesel-electric trains)?

High speed rail has to be energy efficient. TO be energy efficient the train has to weigh as little as possible. THe typical 16 car trainset Shinkansen weighs 700+ tons. Electric power by wire ...
LazyReader's user avatar
2 votes

Failing engine A-Mount (bad design by the automotive manufacturer?)

I think there are two problems (at least) in this case, as follows. First, it is safe to acknowledge that the failure rate of these engine mount studs is not 100% (because there is no recall!). every ...
niels nielsen's user avatar
2 votes

Braking system for a miniature ‘Drop tower’ rollercoaster

Well, if you must use magnets then its possible to utilize a neat physics trick. See there are materials that are paramagnetic (aluminium, copper etc). A magnetic field moving through a paramagnetic ...
joojaa's user avatar
  • 3,577
2 votes

Characteristics of a smooth belt

Do you have a link to the manufacturer? You are correct about the quarter inch (gauge). If I were to guess the varying value is the length of the belt measured as internal diameter. Also remember ...
Sami Safarini's user avatar
2 votes

Orthographic Projection to Isometric Projection

Isometric of (a) showing hidden lines. Hidden line added on bottom right view. Isometric of (b) showing hidden lines. Addition of diagonal on bottom right view means that both the angled and vertical ...
Transistor's user avatar
  • 10.9k
2 votes
Accepted

Why are double-acting reciproating compressors more efficient than single-acting ones?

You will find losses in a single acting compression such as leakage, even with a seal as the pressure difference is high, any leaked fluid in a dual acting compressor is less of a loss as it leaks ...
Sami Safarini's user avatar
2 votes

One way bearings

So check out inclined ramp or sprag clutches or even look at the gear drive used in starter motors. The inclined ramp means that the rollers rotate into a tapering or tightening dimension in one ...
Solar Mike's user avatar
  • 15.9k
2 votes

Looking for bolt with press nut

One name it goes by is a PEM pin. In addition to the various washer names given by Solar Mike, it might also be called various forms of push-on retaining clips/rings (whereas a normal retaining clip ...
DKNguyen's user avatar
  • 5,641
2 votes
Accepted

Trying to detach a detachable handle on a meat grinder

Because the joint created by the handle and the auger bit is solid metal, the threading is, as you've noted, held in place by the rotation. It is common that a sharp blow on the handle in the correct ...
fred_dot_u's user avatar
  • 7,227

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