# All Questions

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21 views

### Is it possible to calculate torque using strain gauges on a rotating shaft?

I am currently designing a torque sensor and am looking into the ability to use strain gauges as a instrument to measure strain and calculate torque. The current setup is two motors connected via a ...
15 views

### Swiss File #4 Alternatives

I want to buy a "Swiss File #4". I visited some local stores but noone knew what that was. I found this nice set of files. Can someone read what it says in the top? Is some of these file equivalent ...
54 views

### Why don't we use hot water instead of steam to drive the turbines?

I guess if we do this then, the size of the turbines could become smaller. The condensor's size also might be reduced. But the catch over here is the energy density of hot water is less then that of ...
100 views

### Torque and RPM calc

started by designing the gear meshing, and now I need to calculate some parameters to determinate if this meshing works for me. The system considers an electric motor, which technical parameters are: ...
27 views

### How can I setup a controller simulator in excel?

Is there a good excel program somewhere or basic breakdown of how to implement a control loop in excel if trying to simulate the performance of a circuit? I have data from an operating plant and am ...
34 views

### Can e-paper capsules be made larger in size?

Can I buy individual (larger in size) e-paper capsules from somewhere? (for an electronics project for example) and is it even possible for such large e-paper capsules to be engineered?
10 views

### How to add a level to component hierarchy in Fusion 360?

Fusion 360 has the "browser" (tree structure) and timeline to represent the CAD model. When I realize I should have created a parent component for an already existing component, how to do this? In ...
23 views

### Measuring Torque in a bicycle [closed]

How to measure torque in a bicycle? how much newtons will produce by the pedal of the cycle ?
20 views

### Beam column joint reinforcement

Why cant we provide the bars cross bent in the beam column joint...as the cracks are all diagonal...so inorder to avoid cracks why cant we provide the bars crossed in the joint instead of providing ...
36 views

### Fluid Mechanics - Fluid flow

I have answered the following questions, however I’m unsure if they’re correct. 1.) For this question do we consider gravity force, I have used it but I’m not sure if this invalidates my overal ...
9 views

### Are dynamic frequency transmitters common? What's the terminology to use when searching for one?

Newbie question, moderately educated on RF but only the signal, not at all about the hardware. Looking to start experimenting on a concept that would require a dynamic shift over time from one ...
61 views

### Wind turbines with down tower power units. Why aren't they more common?

Concerning the big megawatt wind turbines, if there is such a big trouble with gearbox bearings failing much earlier than expected and costly maintanence or replacement of huge gearboxes, what is ...
46 views

### Dimensions of a bar when it is subjected to axial pull

Determine the change in dimensions of a rectangular bar of length 2 m, width 200 mm, and thickness 100 mm, when it is subjected to an axial pull of 20 kN in the direction of its ...
23 views

### Maximum allowable crack in Post Tension concrete

What is the maximum allowable crack size dimension in a post-tension concrete slab before it is considered a "structural" crack, in Arizona, USA? Is there a certain standard for this. I have tried ...
11 views

### Efficiency of pump on VFD?

If I'm replacing a control valve with a VFD for a centrifugal pump, how do I predict the pump efficiency? I've got a pump curve which tells me my pump's efficiency at at a given flow or a given dP ...
22 views

### DC motor Magnetic axis of armature winding vs EMF

When considering the cross section of a DC motor we have: I notice that the Magnetic axis of the armature winding is aligned with direction of the EMF that will cause the rotation. Is there a ...
24 views

### static and kinetic friction force required to tow a train

Today I saw a youtube video of an All-Electric F-150 prototype towing 1 million+ pounds. It's towing a train on railroad tracks. How much force does it take to get the train moving? Once the train ...
37 views

### Grad student needing help with a fluid mechanics issue in project

BROUGHT OVER FROM PHYSICS STACK EXCHANGE As the subject states I have hit a wall in a fluid mechanics associated problem in designing an experiment for my grad project. Long story short, I'm an ...
23 views

### Flux Cored MIG on unknown steels, what is this stuff?

Welding on some unknown Steel, I made the weld, and this stuff formed. It looks like a fast shutter speed shot of smoke or something for me but it's a solid material that has formed. It almost seems ...
54 views

### What is difference between lift and elevator and hoist?

I am very confused by the three terms:lift and elevator and hoist Are they all technically same thing or different??
13 views

### Typical cycletime of an industry pid controller for servomotors

I am wondering the following. What are the typical cycletimes (or timesteps), that are used in real industry-standard pid-controllers (for example for assembly-robots on a car-production-line). I ...
70 views

### What happened to the projectile in Hypervelocity Impact tests?

I recently saw a tweet about Hypervelocity Impact Sample and someone ask how is it possible to shoot a projectile at that speed and what happened to the used projectile when hitting the shield. I ...
12 views

### What non-Gaussian filter should I use

I am developing a filter to better predict my state of my system. I had previously tried an Extended Kalman Filter. I have all the data needed to predict my next step but I have few observations/...
53 views

### I've never seen this type of flexible coupling, can someone tell me what it's called?

Putting together a project, I've found this clutch but I've never seen this type before. It has a sort of flexible plate connecting the two parts, attached to both in two places corresponding to where ...
20 views

### Best reactor for solubility-limited reaction?

I have a reaction where component X is required to react with formic acid producing a solid precipitate. The main problem is that component X has very low solubility in formic acid and the reaction ...
13 views

### Calculate vector analyzer measurement error

How can I find vector analyzer transmission and reflection measurement errors? I use Agilent 8753ET vector analyzer, its datasheet may be found here.
20 views

### What is the effect of ageing on preconsolidation pressure?

Preconsolidation pressure is the maximum effective vertical overburden stress that a particular soil sample has sustained in the past. How far in the past does the soil remember its loading/the ...
25 views

### Health hazards of disassembling electronic devices?

I´ve been disassembling a lot of electronic devices in order to recycle them, separating plastics, electronic boards and bolts/other metal parts. Is there any proof of health hazards for doing it ...
19 views

### Tool to simulate sensor data

Say I have a light source at a distance of 1Km from a light detector (photo detector). Right in front of the sensor, I keep a rotating reticle with some sort of pattern. To better appreciate the ...
20 views

### Carefully attaching Pt-wire to mild/carbon steel surface

Problem: I have a near 100% Pt wire (25 AWG / D ≈ 0.45mm) that I would like to attatch to a cold rolled steel (E235 / EN 1.0308) surface. Assume this surface is flat. Goal: Keep wire attached to ...