Build Definition and 472 Threads

I like to skate around abovetopsecret.com without actually falling in. ;) One of my favorite chunks of weirdness in that soup of insanity is the idea that the Moon is actually a spaceship. Some say it was put here to help create conditions conducive to life, to stir the primordial soup and all...

Data From the rectangular glass sheet ABCD the isosceles triangular part ADE is cut away (See figure) The length of CE is 1m. Problem i. Take the length of DE as x meters, write an expression in terms of x , for the area of the remaining part of the sheet. The area of the remaining part...

I need to build a light dimmer using the PWM on the microcontroller to dim an incandescent 60W bulb. What would be the simplest way to do it ?, any suggestions ?, would a optocoupler and triac suffice ?

Say you have a circuit component with impedence Z(\omega). Is it possible combine it in some way to resistors, capacitors, and inductors, so as to shift the phase of the impedance by a constant?

Could you name your best picks of books that expand on the high school knowledge. Example is the Goldsteins Classical Mechanics which is a classic. What do you recommend for Electricity and Magnetism, Optics, Relativity and Quantum Mechanics? Also what would be the same criteria for some Math...

I'd like to build a simple turntable using a lazy susan and a bunch of spokes (anywhere from 245-360) so that I can rotate the lazy susan one notch at a time and take a photo of an object sitting on tip of it. The goal is to hold a camera steady on a tripod and rotate the object. Can anyone...

Hi guys I want to know if it is possible to construct a multi-spectral imaging device inexpensively as a vein finder. what would be involved? There is a med device that has augmented reality to it and has a lot of other functionality but i think it costs about 10-15k. My budget is about $1000...

I wish build or buy an used particle accelerator in my garage or basement, 10MeV capacity is enough. Is that legal? Many counties no regulation on this matter, I guess.

Hello everyone! Just the forum I was hoping to find! There are really not many ppl to ask about this subject.Had nothing to do about a month ago so I thought that it would be quite fun and interesting to build a cryocooler, it will be a long time project though since I lack many things right...

Hi PF! I'm trying to build a triangular pyramid whose length is 20cm and cross section has a height of 3mm (I have the complete dimensions but hopefully this gives you an idea of the size I'm looking for). The interior corners have to be very sharp, so I can't use glue. The material is glass...

Hi, My father has been dedicating a lot of his time to making our soon-to-be home as "rewarding" (I guess) and as nice as possible for when its done. The new side project would be this. It is supposed to be some rain-proof place for a bench/table outside. There are going to be three (more or...

Hi, recently I've been trying to think of a few ideas for my high school physics/astronomy club to build, and have heard that a magnetic leviator is completely doable. Are there any tips out there for building one? Materials, circuits, etc would help a whole lot. Thanks.

will an aluminum tube 127mm in diameter, 3.5mm wall thickness, enclosed on either end by 12mm thick disks with o-rings be able to with stand 15bar of pressure. Its for an underwater camera housing.

I want to build a telescope and want to know which type of lense is better suit for this. Please anyone help...

It just occurred to me that akin to electric power lines, which in the end just connect a voltage differential over a long distance and facilitate power exchange between the two end points, one could build "thermal power lines". That is, a well-insulated cable that internally consists of a...

Working on somewhat of a budget i have the need to shred aluminum sheeting. I have a foundry with a 4 inch crucible and would very much like to shreader the plethora of stock car bodies at my disposal. I'm unsure what Guage the car bodies are but you can fold it by hand. I'll mostly be...

Hi Guys, I'm new on the forum so forgive me if this has been posted before. I'm kindly looking for some advise to build a pulse coil set up to spin a 13,00 gauss 1" diametrically magnetized magnet. I was hoping to use 120 volt rectified dc or the highest voltage that has readily available...

Hey all. I'd like to build a small windmill in my backyard. Small is I'm going to guess maybe 5 foot blades or so. I do CAD work so I can design most of the parts I need EXCEPT the blades. I have no idea where to start. I understand the basic shape, but I'm unclear where to start to get one...

9th grade student is struggling trying to come up with a design that can meet the below requirement. Any help is appreciated. 1. Homework Statement The purpose is to build a new piece of equipment that can break the descent of an object from a certain height. The object in this situation a...

You can select any type of motor. I'm going to spin it at a varying RPM and with a varying torque. The combination of torque and RPM will be capable of 50 hp intermittently. I can limit the maximum RPM but lower is better as I can leave out a gearbox. No different than what they probably use in...

Hello, I would like to start building a simple DC motor Go-kart, but I would like to build my own DC motor for it. A simple one that can make the car move. I know how DC motors work and I understand the physics of it, but I'm not sure about some things: - Are all DC motors (large or small) the...

Hi, I want to build a router from scratch Does anyone have a good guide to help me get started ? Thanks,

Yes, it finally happened. My Core2Duo build that I created in 2007 finally took a c@%$. This stinks, because I was planning on milking that baby for another decade. The only upgrade I made to it since 2007 was last summer (2014), when I was forced to upgrade to Windows 8.1. So I broke down...

Hi, I need to create an electromagnet that can lift a 1 KG Iron block that is kept at 30 cm away from the electromagnet. I have a DC power supply(RXN 305 D) that can provide a voltage of 0-30 Volt and current of 0-5 A. I need to limit the current used to maximum of 3 Ampere. Please help to...

Hi I am building a motor tester, for that I need to build a variable load. For which I was planning to use eddy current brake with electromagnet. Please help me to build a electro magnet which can provide more than 10mNm load to a DC motor with rotating disc of 75mm in a RPM of 6500. I tried...

I've seen the electrostatic generators as a student but never had a chance to operated one. So I built one. A small one using compact disks. Now I am in the process of building a larger one, using two 12 inch disks cut from acrylic. I've got the completed disks (32 sectors each), base...

Hi, I'm trying to build a capacitor charger that can charge a capacitor to a higher voltage than the battery voltage I have. When reading up on charging capacitors, the simplest method seems to be wiring something similar to the capacitor charger for a camera flash. Unfortunately, a camera flash...

Hi everybody, I've been trying to find instructions on how to build an electric washing machine but am not having any luck! I found non-electric manual operated makeshift washers, but I need something with a little more oomph! The closest thing I've found is someone made a power saw from a...

Hi Everyone, not sure why it is so difficult to find any info on how to build a simple electromagnet with diagrams or plans... but it is! I need to lift sheet plate... thousand poinds or more... something like a 2 car battery design electromagnet for lifting... Please, Please, don't tell me I...

hi my name is michael how do you build a electromaget generator for a high school project .

just wondering...

So I've been writing an algorithm to build a function tree and I believe I'm aaaaallllllmost there. The intent is to take a math function like x^2+x+1*5 and build it into / + \ / + \ / \ / ^ \ x 1 * 5 x 2...

I am not sure where this goes , if this is the wrong place sorry. The question is asking for Time required to build the part. The 4 is the total length of the part. It also says the scanning speed is 80ft/min the spot size is 0.010 in delay time is 7 sec/layer The formula that is...

It's Ti2Ni, which is in FD-3M spacegroup. I have its .cif file which can be loaded by many crystal building program. So I try to build the structure according to the loaded images. I started building a structure with FD-3M lattice. But when I tried to add atoms at the position read from the...

I'm attempting to build an ultrasonic drill to make holes in silicon wafers, since we don't have the budget to buy one in our lab. From what (I think) I know, ultrasonic drills can either work by the "jackhammer" motion of a free floating mass which I don't know how to make, or by the transfer...

I think I have read that massless fermionic states can be used (as a basis?) to build up massive fermionic states. Is that true? If so, could you please give me a very short outline of how this is done, or maybe better, a mathematical statement that "says" the same thing? Thanks for any help!

So I created 2 web pages with the directories C:\..., you get the idea. But on a web page, I created a link for another web page so once people click on the link on my first web page, they can see my other web page. But when I typed the directory on the browser, it came out okay but when I...

Hello. I know a bit of programming, python, C and I tried once the processing language. I'd like to make, sometimes, some simulation on mechanics, with gravity, collisions, springs, ecc... But I have not very much time to spend in creating these things (supposing I could), so I would like to...

http://imgur.com/Tj3wKiy Circuit: http://imgur.com/Tj3wKiy What needed to be built.http://imgur.com/6uw12n5 http://imgur.com/6uw12n5 http://imgur.com/6uw12n5'][/PLAIN] The chip being used is an LM741CN. Scheme Of Pins can be found here Thanks, AP

I was thinking that a good way to learn a lot about basic radios and other non integrated circuit electronics would be to take them apart and fix the connections with a scoldering iron and a multimeter. My goal is to understand how radio circuits work so I can build them and fix them. Any...

Hello. I just want to know if you guys know a website, place, or store where you can use their apparatus and work on a stainless steel plate? Right now I'm planning to create a Hydrogen generator using water with catalyst. Thank you.

I am having trouble connecting some of the differential geometry in gr to what is actually measurable in the real world. As far as i understand we can measure physical quantities in terms of coordinates x^\mu on the tangent space of a 4-dim Pseudo-Riemannian manifold M. So let's say we are...

Need to move some concrete powder, would like to use compressed air or a blower. I will need it to vacuum and convey the product, the storage vessel is broken and there is no way to gravity or manually feed it. The vertical distance is 8-10' and no more then 20' horizontal. I have played around...

Okay, so I'm new to this forum, but I'm hoping I can get some help. I live in the United States, and I'm having trouble converting from metric to standard with the build plans given. I want to build the open source Spaceframe recumbent bike which the build plans can be found...

Hi I am very much interested to build a telescope on my own. I am looking for a complete guide to build a telescope and getting the apparatus needed ? Thank you in advance for all suggestions.

Hello brand new to the forums and I just have one question. So I decided to follow mechanical engineering as my degree of choice and I stand firm with my decision, I'm good at building things and finding unique solutions to problems, but the one thing I'm bad at is math... I'm a little above...

I'm looking for someone who can help me calculate the torque there will be transferred to my couplings between the rollers and to my belt connecting the 2 set of rollers. I have drawings of it all including inventor pro 2011 drawings/file of it all putted together without the belt and couplings...

According to Wikipedia's "Wormhole" essay, this is a metric for a traversable wormhole : ds^2 = -c^2 dt^2 + dl^2 + (k^2 + l^2)(d \theta ^2 + sin ^2 \theta d \phi ^2) If we assume the Einstein relation R_{uv} - \frac {1}{2} R g_{uv} = \frac {8 \pi G}{c^4} T_{uv} what kind of distribution of...

I want to make a betatron at my very own place and can not get much info. abt it. Can anyone help me with it? Also i need some ideas for a science exhibition. please help me. Thank you!

Hey folks! I'm a proud poppa of a dedicated physics and math student. He's outgrown his laptop and is interested in putting together a system exclusively for crunching numbers and doing physics and math related output. He does not require a gaming build (which seems to dominate the "build"...