Engineering Stack Exchange
Engineering Stack Exchange

Most Popular

more tags
1500 questions
4
votes
1 answer

How efficient is the opposed cylinder combustion engine design?

The Opposed cylinder design for gasoline engines is rather uncommon, though several have been made in the past. The expansion forces in an opposed cylinder engine are balanced. For ever force there must be an equal and opposite force. Thus V shaped…
Dale
  • 193
  • 7
4
votes
0 answers

Could someone explain to me the process described in this quote from G.B. Shaw (fragile load transfer system of some sort)?

The idea, as I understand it, is to transfer fragile material (glass bulbs in this case, I believe) from one moving something to another, or over to a platform. This is taking place in the 1920's, I think. Anyway, here's the quote: However, I…
Ricky
  • 299
  • 3
  • 11
4
votes
2 answers

Shear rate of a fluid in a container with a sliding PTFE top plate. Will the liquid move with the plate?

I am trying to work out how a liquid inside a container will be affected by the back and forth sliding of a Teflon coated plate such as the one in the picture. I know how to work out the shear rate of a fluid between two plates moving at different…
user88720
  • 265
  • 1
  • 11
4
votes
2 answers

Designing non-self-locking worm gear

I see that most worm gears are self-locking but I'm looking to make my own non-self-locking POM worm gear. It'll only be of module 1. Does anyone know what needs to be changed in order to make a self-locking worm gear non-locking? Is it just the…
John M.
  • 1,033
  • 1
  • 9
  • 13
4
votes
3 answers

How to increase the air flow rate through a dust-separating cyclone?

I'm making a dust extractor for a desktop CNC milling machine. My design process was very crude: I looked at some DIY dust-separating cyclones, and it seemed like they just work without any advanced calculations, so I visually copied some of those…
bobtato
  • 161
  • 1
  • 6
4
votes
1 answer

Determining mass flow rate and exit velocity of compressible flow

This one's a bit of a doozy, so please feel free to comment on any one single part or parts to this problem. The setup is simple--I have a container (an empty bottle) which I fill with a certain pressure of compressed air through a car tire valve…
Avant Guard
  • 41
  • 1
  • 1
  • 5
4
votes
1 answer

Why does tensile testing in thin films (ASTM D882) require a non-dogboned sample?

The ASTM dicates a plain rectangular shape. I understand that the material necks pretty quickly but I frequently get breaks in the grips, particularly with films of thickness less than 0.002." Dog bone samples seem as though they would help, so why…
Sully45
  • 69
  • 6
4
votes
2 answers

How to specify and tolerance a "sharp" point?

I need to have an electrical probe machined; but I am unsure how to specify my requirements. I am an electrical engineer with only moderate mechanical knowledge. The probe will be machined from 0.125" diameter stainless steel round stock. The last…
PaulB
  • 151
  • 2
4
votes
2 answers

Statics and Structural Analysis: Determinacy in beams/frames

I have a question about the methods to decide whether a beam/frame is determinate or indeterminate. Typically you can count the number of reaction forces and compare them to the number of elements to determine this. The typical equation for a…
Grady F. Mathews Iv
  • 91
  • 1
  • 4
4
votes
1 answer

What is a flexure bearing?

I have been reading a lot on flexure bearings, but it's still not really clear what they are. From everything I've seen, it seems like a flexure bearing is just a spring. Can someone give me a simple explanation of what they are and their use?
Capybara feet
  • 43
  • 3
4
votes
1 answer

Maximum transmissibility of sky hook damper

I have been studying the sky hook damping system. On page 14 of paper linked above, I found that the maximum transmissibility of sky hook system can be calculated by: $$T_{max} = \dfrac{1}{2\xi}$$ where $\xi$ is the damping ratio and $T_{max}$ is…
KKS
  • 354
  • 1
  • 12
4
votes
4 answers

Why use bushings of different material than what they contact?

I've heard that materials that need to slide against each other should be of different materials. Why is that?
uncaged
  • 71
  • 1
  • 3
  • 5
4
votes
2 answers

How was the trajectory of the V2 ballistic missile (during boost phase) calculated?

I'm well aware of Helmut Hoeltzer's "Mischgerat" analog computer, and I read that it not only served as a kind of "fly by wire" computer on board of the missile, but also as a simulator on the ground that calculated V2 trajectories. But, I didn't…
user2554
  • 225
  • 2
  • 8
4
votes
3 answers

Can the strength of a strut be determined by deflections?

I am interesting in replacing a solid strut with tubing, but I do not want to destructively test the strut to determine its yield point. I do not want to make assumptions about the yield point based on material, because heat treatment and other…
Wallace Park
  • 1,635
  • 2
  • 16
  • 25
4
votes
5 answers

Is it possible to remove Staedtler ink from a paper?

I am practicing engineering drafting and sometimes I am near on finishing my work but suddenly I make a mistake. Is it possible to remove the ink? If yes, how? Where can I buy such tools? I am using a Staedtler's Mars Matic 0.5mm.
Cary Bondoc
  • 209
  • 5
  • 9
1 2 3
…
99 100