Designing Definition and 577 Threads

Hi, I get parts made in China, and I need to make a full CNC drawing. It is a modified 1/4" BSP nut and orifice fitting. I cannot find anywhere how to draw the nut and orifice so they work correctly. This is the part they make the most mistakes with, as the tolerances are small. It is not...

For a 3rd order system, can I use 2nd order approximation (granted dominant pole is ≈5 Tau away from third pole), when designing a Lead or Lag compensator? Can this OLTF = K/{s(0.1s+1)(s+1)} be approximated to 10K/{s(s+1) which ultimately gives CLTF=10K/{s(s+1)+ K} ? and then design...

Homework Statement I have some very big difficulties with this assignment, hope someone can give me some clue in the right direction Design the boost converter represented in and operating in continuous conduction mode (CCM). The usual hypotheses apply: the output voltage is considered to...

I would like to design a telescope from the ground up, the only parts that I will not be making myself will be the mirrors and eyepieces. I've already decided I needed focal length equations, what others will I need to build it? I'm going to go for a truss tube dobsonian, (I've seen some ideas...

Hello all, I'll start by explaining that this is my first post, and I have very little engineering and mechanical knowledge. I am currently completing my phd in neuroscience so the purpose of this post is to seek information to indulge in some of my hobbies :) I am designing a machine...

I'm trying to make an electric lighter ( like this http://imgur.com/a/wg8q7) using the framework of this guide. http://www.instructables.com/id/Make-a-battery-powered-soldering-iron/?ALLSTEPS except mine will have a few more feature and the soldering tip will be replaced with nichrome most...

Homework Statement Using the circuit layout shown in Fig. 9-15 (Standard LRC circuit), design a tuner that uses a variable inductor, a capacitor, and a resistor. The input impedance of the tuner should be 377 Ω at 1 MHz an its bandwidth should be 2%.Homework Equations The Attempt at a Solution...

I want to design a bidirectional DC motor , so use four transistors in the H bridge circuit. I can understand the first circuit, but for the second, I can't understand why input signal , eg: A, is connected to the same side of transistors? What is the differences, which one I should...

Hello everyone, I am an aspiring math teacher taking a workshop type class and in two weeks my group will be teaching the other students various topics on probability. We are trying to come up with a fun and interactive way to teach the counting principle, permutations, and combinations. To...

Homework Statement Design and show a foster 1 network z=(x^2+4)/(x(x^2+2))Homework Equations The Attempt at a Solution So first I did the partial fraction expansion and I got (2/x)-(x/(x^2+2)). Next I got everything in the denominator so (1/x/2)-(1/(x+(2/x)) when I do this though I get all...

hey guys, new here. need some kind of help im required to design a gearbox which will be used to life an object of 2kg. details of the motor used are as follows: http://www.jaycar.com.au/productView.asp?ID=YM2712 have been trying to calc the number of gears needed, number of teeth on each...

For fun, I'm trying to make a C++ program that takes a word from the user and comes up with an ordered list of suggested words, similar to the kind of thing you have on your cell phone when sending SMS messages. So far I have: An [FONT="Courier New"]std::vector<std::string> of the 5000...

Hey I want to build a pneumatic arm that can throw stuff around (see attachment image). Before actually ordering the stuff i want help with some calculations. i want the arm to be able to push 5kg load (rectangular shaped) straight up into air. the arm/plunger area that makes contact with...

Good day everyone, I was designning the wing for a school project and I wonder if there is any equation for defining the aileron size. I am designing a straight rectangular wing. I just found on other forums that the aileron's length should be 0.25 of the wingspan and the aileron chord should be...

I am working on a small project and having those values shown in real time on the device will be helpful. I don't have much room as it is. I currently have one of those little 1s-6s volt meters used by RC hobbyist and use my multimeter to check resistance. My goal is to have something around...

Hi all, I need a proper software for designing microwave cavities. I intend to use simple base geometries (e.g. closed box) with some modifications, like holes for optical access or for feeding the MW. These modifications however may seriously affect the Q factor, the frequency or might...

Hey guys, I have a question I am currently doing a project, which pretty much I've wanted to design a headphone with some customizable functions. I've posted a picture, just to help you guys picture more or less what I wanted to do (but it's not the actual design at all) What I wanted to do is...

Homework Statement Design a voltage divider to provide a voltage of about 5V (±10%) across the variable load. The load-current demand varies in the range of 0 to 5 mA and the available dc-supply voltage is 15V. Homework Equations The Attempt at a Solution Here is the circuit...

I need to create a machine that'll help me clean out my crystal decanters. Brown rice and soap work great, just shake and viola...however some decanters need a bit more shaking, or 'spinning' of the rice and soap than I can provide so I've devised a plan with a box fan motor that would create a...

First of all, if this post is inappropriate in any way or located in the wrong sub-forum please just let me know and I will correct it (or delete it). I am a long time reader of this forum but I have never posted before this. I really appreciate all of the people that contribute to this forum...

Dear all, For a project I'm going to design a servo system that will output an amplified hydraulic pressure, whereas the input is a force or pressure as well (not per se hydraulic). Output and input must directly connected due to the force feedback. I don't have a lot of experience with...

Hi I was wondering how to design the horizontal pressure vessel on twin saddle that is not a symmetric shape using PD 5500 code. For example, Annex G of the code shows how to design with twin saddle, but it is only approach with the symmetric pressure vessel. Anyone has an idea or any...

Homework Statement Begin the design of the multiplier by adding more detail to the block diagram. The parts available for your design are • D Flip-flops (74LS74A) • 1 4-bit Up/Down Counter (74LS169) • 1 4-to-1 MUX • 1 4-bit Adder (74LS283) • 2 4-bit Parallel Shift Registers (74LS194A)...

I have to design a space rover for Mars that has to have quite a few operating gadgets on it. Without giving a lot of details I am using sketch up and needless to say it sucks. I can't even figure out how to make a wheel. and I can't make objects at angles, like shafts or motors or anything...

Hi, Firstly i just want to apologise if this is in the incorrect part of the forum. I'm designing and building a motorbike frame for my 3rd year project in Mechanical Engineering. I've started my research into finding the optimal geometry for the purpose of the frame, however I'm...

Me and my group for our class are planning on making a can crusher for our project. What makes ours so unique is the ending, Plinko game. We are trying to make a Plinko game out of the can after its ejected from the crusher. My part of the project is the Plinko game. My group suggested that we...

I'm having to design a screw pump and I'm a bit confused about things, I've never really seen a screw pump before. I've decided upon a twin screw - screw pump and my first question is why do most examples have an outlet at a higher level than the input, surely that just leads to a pressure loss...

I would like to design a 3D printer. I know that sounds very ambitious (and probably stupidly unrealistic), but I'm not talking about the fanciest things on the market (like glass/metal printers). I just want to design a printer that can print to a great resolution and in mixtures of 3 primary...

I am designing an energy harvester consisting of a magnetic spring. The figure is given in the attachment. I have done the magnetostatic analysis (using Ansoft Maxwell 2D). But, now I am facing problem with - Force vs displacement curve of the moving magnet To calculate the output power...

Hi everyone. I've got my BS in physics, but I don't know much about electrical engineering. I've had a passing interest in do-it-yourself audio equipment for quite some time (designing and building your own speakers and amplifiers), and I've finally decided to get serious about it. So, it...

My brother has a friend who is quadraplegic and is at a loss as to how to design a mechanism for him to use his computer efficiently , does anyone know of such a device or have an idea as to how to start the design of this [mouse mover] any advice will be welcome as this guy is wrighting a book...

Hi, For a final drive of a light commercial truck, I have to design a final drive helical gear pair. The expected ratio is 8.2. The centre distance is 134 mm. The input max. torque is 120 Nm. I have sized few combinations. I have a feeling that this ratio is too deep. Pl. share me your...

I posted another thread here talking about two instrument designs using strain gauges. One was for measuring torque, and the other for acceleration. I would like to go ahead with designing an accelerometer using a full strain gauge bridge. The basic idea I have in mind is similar to this...

I am busy studying engineering and I have a subject that requires us to design and build a working instrument using strain gauges. We have a workshop at our disposal and all necessary materials and electronics. At this moment my group and I are stuck with coming up with an idea for an...

Hi, I apologize in advance for not knowing the right terminology, I've been on wikipedia for the last two hours and my brain is mush. I'm trying to design a basic circuit that will cycle through multiple circuits in series. I really have no idea how to describe this, except to draw it. I know...

In designing a circuit what point should I pick as the ground point? I know it's the reference node in schematic to calculate node voltages and could be anything, but when designing the PCB there should be a physical point that adhere to some conditions as I guess that make it a valid ground...

Hello good people, I'm a junior engineer currently studying in an Adv.Diploma in Mechanical Engineering. I have been tasked with the project of designing a gearbox and I'm having a bit of difficulty getting started as I'm not that experienced with gears. The client requires a 25:1 reduction...

Hi, I am designing an ASK demodulator for RFID Tags. I have attached the circuit diagram. This is the ckt from IEEE paper. If you look at the ckt, the first stage is the inverter kind of thing. I didn't get why second NMOS is used for Stage I. Similarly, the second stage is also inverter...

Hello all, I'm putting the finishing touches on a gravity fed irrigation system and I would like some informed input on my design. The system starts at a creek about 500 feet uphill of my garden. The creek usually dries up during the driest parts of the year, which means I need a reservoir...

Good evening, I am curious as to where I would start if I wanted to start a career designing microprocessors? Although my major is mathematics I have taken Digital Logic courses and many other EE courses. I am very interested in the process behind processor technology. While it's relativitly...

Hallo guys , I am first year electrical Engineer Major & we are asked to design and simulate using Multisim a small ALU , The ALU is a 4-bit digital circuit that performs addition, subtraction, ANDing, ORing, complementing, XORing, XNORing and comparison. The ALU also outputs if the answer is...

[FONT="Times New Roman"][SIZE="4"] I have a decent background in generators and my brother had an idea for building one he wants me to help him out. Without getting into specifics, it would be a natural energy generator integrated into his home electrical system. I have run into some issues...

Hi, I had an idea for creating a clock that could time femptoseconds, although it's possible that this design would most likely fail and only create some crazy diffraction patterns, but anyway, here was my idea (I also didnt' want to waste forum space anywhere else but General Discussion with...

to my fellow mechanical engineers, please help me with some basic machine design problems. a certain drive shaft rotating at 500 rpm transmits 200 hp to an 8 inch diameter gear. Design a suitable solid shaft for this application. the shaft is ductile. Design stresses are to be limited to...

Hello everyone! This is my first post here, and I'm a recent graduate (within 1yr) of a BS in Mechanical Engineering. I have always been a car nut, and I'm interested in designing, or installing and tuning, a stability control system for my car. I recently purchased a 2012 Subaru...

Hey guys looking to design something that will rotate a 2kg discus in place. I attached a simple schematic of what it will look like. I also don't know what kind of motor to use to rotate the shaft. I went to Fry's but their motors looked to weak to power it. Anyone know a site I can buy a...

Hey guys. I want to design a UAV that can do mission such as detection of powerline's hotspot. I've no idea what is the best sensors should i use for this mini-uav? I've been looking at FLIR, but it's so expensive. so i think i should create my own sensors or use a cheaper one. Any idea what ir...

Homework Statement Design an op-amp based circuit to produce the function Vout = 5*V1 - 4*V2 Homework Equations The Attempt at a Solution I have no idea how to approach this. I know there are two voltages on the two inputs, and that the feedback resistors should be going to the...

Homework Statement I am designing three amplifiers: 1. is an noninverting amplifier with G=200 2. is an inverting amplifier with G=-50 3. is a summing amplifier with V(out)--50V(in1)-3V(in2)-15(Vin3) all problems i(outmax)=2mA So far the only problem I have figured anything about is...

Hi, I thought this would be a simple project but I have not been able to get this to work. I need to design a circuit that exhibits a resonance below 3kHz. It must be underdamped, and the drive current limited to ~5mA. I was usign this as an inductor...