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1500 questions
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2 answers

What should the size difference be between a lid and a container?

I am designing a box and lid (for a home-made micro computer). Using Autodesk Inventor (Student Version), I've created my box which looks something like this: I plan on 3D printing (ABS Plastic) the box and lid in the end. And I am going to create…
Thomas Gerot
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How metal fittings seal connection without rubber gaskets?

I am well familiar with the concept of gasket. From my non-mechanical engineer perspective, I can understand how a standard rubber gasket works in various plumbing and automotive applications (such as O rings etc). However, working on both auto…
amphibient
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2 answers

Having three heaters on single PCB

I posted this question on electronics SE, but was suggested that I post it here. I basically having three heaters (serpentine pattern) on a PCB (fiberglass board), as the following image shows: The ones at the end would be heated to 95°C, the ones…
Koushik S
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6
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2 answers

How to drill larger bore in pipe?

I am trying to bore out a red brass pipe from 3/8" to 10mm using my drill press and a standard twist HSS bit. Running the drill at 600rpm I can't get more than half an inch in before the drill starts binding. I tried running first with cutting…
feetwet
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6
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2 answers

Dead Load / Self Weight for ceilings & HVAC

I need to design the roof structure for a sports facility. I have no information with regard to HVAC design at this stage. Also, the HVAC may change in future. Thus I don't know what load to apply to the structure. I intend to give the HVAC and…
SlydeRule
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6
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3 answers

Is this Square Track Cam valid?

I want to convert rotary motion (the orange propeller) onto a square path (the dark gray path). Is this a valid way to go about it? Would it be possible to use a square peg instead of a round one (the red circle) in order to keep the peg level as it…
skibulk
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Is a Transatlantic tunnel technically possible today? How feasible would it be?

The question has been surfacing periodically in the media and books over the past 100 years or so. I realize we're talking about a lot of material and work hours to begin with; the subsequent maintenance would be a nightmare. There are no power…
Ricky
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6
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1 answer

How does expanding gas in isobaric process move a piston?

If we have a simple adiabatic cylinder with a piston on top and we heat the gas from the inside, the gas starts to expand and move the piston up. This process is isobaric; but if the pressure on the piston doesn't change, how does it move up?
noidK
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3 answers

Do car power windows have limit switches?

As part of an ongoing Raspberry Pi project, I want to automatically open and close my car windows depending on the interior temperature and whether or not it's raining. Currently, when I manually hold the window switch down after the window is…
Carlton
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Calculating a transfer function from a block diagram

I've been having trouble doing this school assignment. My professor has not taught the class how to read control block diagrams so I assumed that we were supposed to research on it. I've watched a few YouTube tutorials online and have been able to…
John
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6
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Feedback control of two-link planar manipulator

TL;DR: how can I calculate the disturbance at each joint due to coupling forces in a two-link planar robot manipulator actuated by two independent DC motors? I'm studying control theory and trying to work through a simple example using a two-link…
user2398029
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1 answer

Bulk Volume vs. Solid Volume

If I pour a sample of aggregate into a container full of water and measure the displacement of the water due to the sample, does this give me Bulk Volume or Solid Volume? And what is the difference?
user3507
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How do I compute combined tensile strength?

If I know the tensile strength of a pin, how do I compute the total strength of multiple pins? That is, 2 objects are connected by multiple pins, evenly distributed, each with a height of $2mm$ and a cross sectional area of $3.33mm^2$. For some…
William B.
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4 answers

Is copper wool (rather than traditional brass wool) good for cleaning heavy black oxidation off soldering tip?

Preliminary Assumptions: Metal hardness matters: I am assuming metal hardness matters when it comes to cleaning soldering tips with metal wool. Chrome tip quality and material: I am assuming (good quality) soldering tips are chrome…
Prashanth C
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6
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3 answers

Remote start on a car with manual transmission

I'm making a remote starter for a car using a Raspberry Pi. The problem is that the car has a manual transmission. The driver needs to remember to place the gear shift in neutral when parking, otherwise all kinds of bad stuff could happen when the…
Carlton
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