Tiger Guy
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3 answers
16 votes
5k views
Why do heavy trucks use air brakes?
13 votes

Several characteristics led to the adoption of air brakes. The primary one is reliability. A leak on a hydraulic brake system means the brakes don't work. A leak on air brake system means the ...

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2 answers
13 votes
3k views
What would "wired houses" refer to in 1928?
13 votes

they mean wired for sound. Previously movies were accompanied by a pianist or organ player.

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6 answers
6 votes
3k views
Metric bolt shear strength for a layman
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12 votes

For a layman, you shouldn't use bolts stressed in shear. Bolts seldom hold shear forces. Bolts are used to hold two surfaces together so that the joined components take the shear stress. It is the ...

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2 answers
4 votes
447 views
Amp-Hours vs Volts in electric chainsaw specifications
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8 votes

It is hard to be certain, but higher voltage tools generally perform better. What matters in most power tools is power. Power = volts times amps. We can get power using lower voltage, but the higher ...

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8 answers
9 votes
2k views
Definition of buckling as a sudden deformation
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7 votes

Yes, buckling is a sudden change in shape. A unevenly made column that bows as a result of increasing stress would just experience deformation. Or a metal bar bent by a "strongman." Buckling is ...

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4 answers
6 votes
3k views
What is the maximum angle of a shelf angled brace?
6 votes

There is no maximum angle. Theoretically a shelf could be supported solely via cantilever (a support coming straight out from the wall. If the angle in use is the angle from the wall to the support, ...

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3 answers
1 votes
71 views
Why actuators are mounted in inverted position?
5 votes

The cylinder will be mounted where it is easiest to get the hydraulic lines to it.

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1 answers
-1 votes
67 views
How much longer could Titanic have remained afloat if it had gotten rid of its anchor and chain right after hitting the iceberg?
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5 votes

A Negligible difference If the anchor and chain weighed 116 tons... Compare to the weight of the unflooded Titanic: 52,310 tons So the anchor & chain was 116/52310 = .22% of the total weight of ...

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6 answers
5 votes
969 views
Mechanical mechanism that regulates gear's rotational velocity
5 votes

There are multiple things going on here. Your question indicates you have a variable input speed but want a constant output speed. The answer to this on its own would be a continuously variable ...

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1 answers
2 votes
85 views
Hack a kitchen freezer for lower temperature
5 votes

No. The minimum temperature is set by the characteristics of the refrigerant. You could conceivably use a refrigerant with the characteristics you want, governed by a new thermostat setting, but I ...

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1 answers
0 votes
83 views
Is there a difference between a "brushless motor" and a "motor without brushes"?
5 votes

I suspect this is just a Brushless DC Electric motor What Dyson seems best at is marketing their tech and branding it to sound exciting.

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1 answers
0 votes
48 views
Can you uncouple the locomotive from the rest of the train at high speed in an emergency?
4 votes

US freight knuckle couplers can be unhooked at speed. A fictional coupler might work or might not. Couplers for other countries provide almost endless varieties. US-style freight couplers can be ...

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1 answers
1 votes
439 views
Why does the manual to my floor fan tell me to pull out the cord whenever it's not in use?
4 votes

No good reason Probably the legal department decided it was a little safer to not have power to the device all the time. Practically, there is no reason to do this.

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2 answers
1 votes
64 views
What, roughly, are the characteristics of nuclear power in grid management?
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4 votes

In the US, Nuclear is used to base load the grid. As implemented in the USA, Nuclear energy has very high fixed costs and relatively low variable cost. So it is in the utility's interest to run their ...

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1 answers
2 votes
36 views
Converting kJ provided to a closed system into final temperature of the system
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4 votes

We need the pressure of the mixture to know the latent heat of vaporization, but since we are using 100 C, we'll assume it's at 1 atmosphere. Convert the liquid to steam using latent heat of ...

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1 answers
1 votes
265 views
Does the the field of tribology include the study of adhesives?
4 votes

No, it does not. I do not think that adhesive science people have managed to come up with a fancy name like the lubrication folks.

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1 answers
1 votes
109 views
Were steam locomotive fitted with centrifugal governor?
4 votes

A governor is a poor application for steam locomotives because the throttle is constantly adjusted by the driver. Speeds, loads, and steam pressure change constantly, plus a major part of driving a ...

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10 answers
13 votes
6k views
How did mechanical engineers work before SolidWorks?
3 votes

We didn't have to ask how to use our tools. This SE is filled with how do I... for Solidworks, Abaqus, Ansys APGL... I guess we spent more time drawing and calculating, versus figuring out how to ...

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15 answers
9 votes
8k views
Is there a way to make an air conditioner without venting heat outdoors?
3 votes

Edit 1 based on the current version of the question "Where can heat be vented from an air conditioner that isn't outside, in the attic, or into the ground?" Answer: It is possible to put ...

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2 answers
3 votes
72 views
How to measure a screw pump spindle?
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3 votes

I suppose you could just measure everything. I would frankly expect that no matter how accurately you measure, however, you may or may not get back what you want. But, OD of threads "Thread"...

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1 answers
1 votes
82 views
Electrical potential and grounding in a circuity, why it works?
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3 votes

The issue is certainly NOT that the chassis ground is at -100V, it's absurd. The chassis ground by definition is at equal potential for power supply and load, you can treat it like one big wire that'...

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2 answers
1 votes
63 views
What materials should I use to build a working 1:50 scale battleship?
3 votes

I question if you have really thought through what you're asking here. A 1/50 scale Yamato "boat" would be 5.25 meters long. It almost doesn't matter what you build it out of, the materials ...

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3 answers
1 votes
79 views
Mechanical Engineering: How To Amplify Kinetic Energy In Axial Rotational Gear Machinery?
3 votes

A simple machine is what you're referring to. A simple machine turns motion into mechanical advantage. Examples include: lever inclined plane pulleys wheel & axle gears inclined plane/wedge/...

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1 answers
1 votes
53 views
FE Exam practice: "How many years until you're a millionaire?"
3 votes

I'm not doing notation for this, it's simple algebra. X = 1,000,000 = 5000 / .1 * ((1.1)^n - 1) 1,000,000 = 50,000(1.1)^n - 50,000 1,050,000 = 50,000(1.1^n) divide both sides by 50,000 21 = 1.1^n etc.

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3 answers
1 votes
346 views
Transformers and systems with gears have similar computation when having quantities refer to different parts. What is the general concept?
3 votes

There is no general concept except for proportionality All you have discovered is that ratios are used throughout science and engineering. Simple machines (gears are only one example, you also have ...

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1 answers
0 votes
46 views
Can't tesla turbine work on air heated by solar concentration?
3 votes

Could you get it to work, sure. There are dozens of ways to turn heat into energy. Could you get it to work at scale and cost effectively? Almost certainly not. There's just not enough energy in ...

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2 answers
1 votes
70 views
Is a pneumatic cylinder in general a linear or rotary actuator?
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3 votes

A pneumatic cylinder is linear by definition The form factor for a cylinder defines this. You can turn this linear motion to rotary via a crankshaft or rack & pinion, to give two examples. You ...

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1 answers
1 votes
38 views
Why use a reference volume for leak testing?
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3 votes

Pressures change in a vessel based on ambient conditions. The reference volume removes that source of error.

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2 answers
2 votes
396 views
How do center of gravity varies in submarine between surface and submerged?
3 votes

Main Ballast Tanks on US nuclear submarines are basically tori (donuts) surrounding the pressure hull. If you could get your hands on actual drawings, I suppose you could calculate the small ...

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1 answers
-1 votes
293 views
Complexity of Medtronic respirator vs. DIY
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3 votes

A typical DIY shop would fall over the electronics immediately. This is more a piece of electronics than a mechanical device. First of all, the shop would need the source of the chips which as far ...

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