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1500 questions
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3 answers

Equivalent viscous damper for friction damping

I have a friction damping system which is exited by a harmonic force FE (depicted on the left side). Is there a way to convert the friction damper to a linear or nonlinear damper, such that the damping at a given excitement frequency is equal? I am…
M. Martin
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Amp-Hours vs Volts in electric chainsaw specifications

Can someone please explain what I am losing/gaining in the trade-off between Volts and Amp-Hours when buying a piece of equipment such as a chainsaw. I'm currently comparing two items. I'm making this concrete with actual products because I think…
Guy
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Flattening teflon plate

I have a 6" x 6" x 1/4" piece of carbon filled teflon that is slightly curved (I think it must have come off an roll of enormous diameter) that I need to flatten. The carbon fill is carbon black, not carbon fiber, in order to make the material…
DKNguyen
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Ensuring even flow in liquid pumping in distribution circuit under suction

I have a liquid circuit which looks a bit like that: The system is under suction, and the flow rate through each unit should be about 10ml/min. However, we noticed that unit n and the ones the furthest away from the pump and bottle were not getting…
am304
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Can aluminium foil be a thermal insulator?

I've searched on Google that aluminium foil can be a thermal insulator, but how does it work? From my thought process, it should've been a conductor because its a metal, right? But, some said that because its so thin and has large surface area, the…
el-cheapo
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Improving ac efficiency in car

I live in Oklahoma. HOT in summer. I drive a small car. Honda Fit. Seems to me, a smaller cabin would cool faster than a larger one. If I "made my car cabin smaller," would the ac work better? I was thinking empty pop bottles, but figure need to…
Rob Dye
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How does my automatic car shift without complete temporary loss of acceleration

When my car shifts gears, the car's acceleration never goes to 0. I feel that there is constant torque to the wheels throughout the entire shift. How is this possible during a gear change? Transmission is Ford's 10R80
Ardalan G.
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Alternatives to laser line?

I'm trying to project a very thin line at a low angle over some surface defects (peaks and troughs). The scale is ~20mm square, but the defects can be sub-mm (0.2 - 1.0mm). I am currently using a line generated by a laser pointer. The $4 laser…
John
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Filling gaps in heatsink design to improve thermal conductance?

I am currently pondering modifying my laptop's heatsink and am curious whether I stand to gain any benefit at all. The CPU and GPU (similar heatsink design) reach high temperatures (90°C +) under load and the exhaust air is warm, but far from…
Betaminos
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Engineering Best Practice: Rev control for trial parts after release?

In my company, we distinguish prototype from production prints by numbered vs. lettered revisions in the title block, and numbered revisions don't require an ECN in the title block. This allows us to efficiently track prototype revisions during the…
rothloup
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Difference between temperature and heat

It is becoming very difficult for me to understand the difference between temperature and heat. About heat all I have read : Heat exchange is related to as exchange of matter + energy. Heat is related as total kinetic energy of molecules.…
S.M.T
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What does MM prefix mean in MMtoe?

I was reading documents about energy importation and came across the following: The import was of 5,915.87 MMtoe I wonder if MMtoe = $10^6*10^6$ toe = $10^{12}$ toe. First time coming across a unit expressed like that.
RSM
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Linkage of two shafts that need to rotate different angles

I have two switches that have different throw angles the switches have shafts coming out of them which are connected the the cams that can be seen in the attached pic. One needs to rotate 95 degrees to throw and the other 83 degrees to throw, the…
Cooper
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Why do monocrystalline solar cells have rounded/cropped edges?

What is the meaning of this croped part? Why do they crop it, rather than let it be full square?
PhysicsSolvesAll
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1 answer

What is this "clamp" place on a piece of bar stock while turning it in a lathe for?

I am watching a Youtube video depicting someone machining a crankshaft for a miniture rotary engine. Around the 4:27 mark after preparing some bar stock the person in the video places some sort of clamp on the stock before putting it into a lathe…
KDecker
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