# All Questions

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9 views

### What plastic material is best for a snap-fit design?

I'm designing a plastic holder that will secure a metal part with snaps. Which plastic will be able to take multiple removals and re-insertions without getting weaker (bent out of shape) over time? [...
329 views

### What is the engineering standard for filenames with fractions and inches?

I need to save some engineering files that need the thicknesses in the filename. Windows hates "/" or "\", so I can't use a simple fraction. Symbols like this... ⅓, ⅔, ⅕, ⅖, ⅗, ⅘, ⅙, ⅚, ⅛, ⅜, ⅝, ⅞ .....
5 views

### What type of engineer/professional designs hydroponic farms?

What kind of professional/architect/engineer builds agricultural systems, specifically automated hydroponic systems? Things such as growing, cultivation, lighting, plumbing, harvesting, processing ...
90 views

### How to increase maximum rotational speed limit of a reduction gearbox?

Reduction gearboxes made of machine steel gear have a maximum limit to prevent changing their physical properties (softening). They change their properties as a result of the temperature increase ...
17 views

### Pavement Mechanistic-Empirical Design application (v2.3) - Rehabilitation Flexible Calibration Factors

In v2.3 of the software, we noticed that in the rehabilitation flexible calibration tab, there are no standard deviation inputs for thermal cracking. They do appear in the new flexible rehabilitation ...
29 views

### NASCAR corners on public roads

Why don't engineers build highways with corners such those on NASCAR speedways?
20 views

### Mounting an antenna base on a roof using only double sided tape?

I want to put a vertical antenna on top of my roof. The antenna is basically 4 meters of PVC pipe and 5 meters of 19mm aluminium tubing. The roof at my house is corrugated sheet metal, and I want to ...
11 views

### Phrase to describe products that meet “test for” standards?

Often in the case of safety related products - My example is EN54 Fire detection and fire alarm systems. For a product to say that they comply with this standard, the product has to be tested and ...
10 views

### At which stage can borate solutions be injected to metallurgical coke?

Borates are effective to increase CSR of metallurgical cokes so that can be added to the metallurgical coke in the process, which place is best for this belching process? Coke ovens? Coke ovens (...
48 views

### Center of rotation (rigid body)

I know the meaning of (instantaneous) “center of rotation” and “center of zero acceleration” for a rigid body. I know that they do not coincide (in general) and that their positions change with the ...
17 views

### Safety of a 4inch wall

One of my house's wall is 4inch wide. My house has one room . and other is lobby that is fully covered by roof. Its wall facing the outside road is 9inch in width. But one wall of it facing to our ...
23 views

### Why do we analyse frequency response for step inputs?

In my class I'm in, our lecturer presented frequency response methods such as the nyquist plot and bode diagrams. Then when designing a lead compensator later, he said one of the specifications should ...
283 views

### Is it safe to slightly cut the edge of RCC beam for passage of AC Vent and wiring?

My electrician made a cut in the wall and the beam as in the image in my absence. The cutting is done with hammer and chisel and it is around 1.5inch deep..I'm really worried that it might impact the ...
362 views

### Beam-to-Column-Stiffness ratio

This parameter defines the structural behavior, defining shear or flexure behavior of the structure. How do I use this parameter to define the stiffness matrix of the structure to perform dynamic ...
123 views

### Flow metrics of water at 12 bar through a 6" diameter open ended pipe 100 ft long

I have a water jet pump pushing water through a 6" diameter open ended pipe 100 ft long, I need to get 12 bar gauge pressure on the pump discharge, what size (m3/hour) pump do I need ?
37 views

### I'm looking for a way to keep a wire coiled when it's not being pulled on, and retract when it isn't

I'm working on an application where a panel rests on a flat plane, and is hinged along one edge with a bit less than 90 degrees of travel. I need to run a wire from the flat plane to the edge of the ...
13 views

### Determining the minimal needed wall thickness between two bores in a control block

Given a control block of simplicity with only two bores. These two bores could be parallel or just could be very close to each other at a specific point in the control block. The material of the ...
275 views

### Buoyancy force problem

I'm trying to design a kind of water valve with inexpensive materials as a first prototype. The water flow from the PVC pipe (1) reach the body of the valve and pass through an aluminum grid (3) to ...
23 views

### Why do pitching machines use wheels and not solenoids, actuators, servos or peumatic cylenders?

I guess that generating movement is harder then keeping a wheel rolling, but in terms of power consumption is it possible to compare the power consumption of a motor for driving wheels to that of a ...
33 views

### Is this space elevator idea plausible?

https://imgur.com/yU8ttVq A better Space Elevator idea: Here is my revised space elevator idea. This variation of the space elevator concept solves the flaw in most designs because it doesn’t ...
31 views

### How to find Performance assessment (IAE and ISE) of a PID Controlled system?

The Integral Absolute value Error (IAE) and the Integral Squared Error (ISE) is to be analysed. A PID Controller is given as follows: ...
30 views

25 views

### How to derive a value from a transfer function

I have a scenario where a valve q_in(t) is pumping water into a tank of height h(t) and area A, which is then pumped out by a second valve q_out(t) that has a resistance to water flow R. I got this ...