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Metal Triangle project ideas

I happen to have 106 aluminium right-angle triangles. They measure: 15x20x25mm Any great ideas?

Topic by sdfgeoff    |  last reply


Measure triangle wave with DC ammeter

If I measure a positive only triangle wave with an analog DC ammeter will it give me a relatively accurate current measurement?

Topic by kenw232    |  last reply


Ball based on Hexagons and pentatgon triangles Answered

I have looked high and low for the pattern that is used to make the pentagon and hexagons out of paper, and or cardboard.  It's groups of triangles that look somewhat flexible put together to form a ball shape.  I want to turn this into a lamp.  I just need to know how to fold these bad boys.  I've studied the picture for 3 days now, and I am still stumped.  Can anyone steer me in the right direction please?  Thanks in advance!! I've included the pic I have been studying...

Question by JosiePosie76    |  last reply


How to square wave ---> triangle wave?

Currently I have developed a flyback driver that is a semi-cross between a classic ZVS circuit and a 555 type driver, mainly just using a few comparators (one to create a triangle wave and 2 others to respond to the upper and lower peaks and drive MOSFETs. This allows me to create a modified sine wave with adjustable duty cycle.) This topology is even more powerful than the ZVS driver at 12V, as I got some INSANELY thick arcs!! However the MOSFETs get a little too warm, and I was forced to use sil pads to galvanically isolate the drain from the CPU heatsink. They seem to have really poor thermal characteristics as the heatsink stays cold while the transistors get uncomfortably hot within seconds!! To make this thing operate at the resonant frequency of the flyback, I think I will a feedback coil that would get "squared up" using a resistor and zener diode. I need to convert that signal into a triangle / sawtooth wave of fixed amplitude. A simple RC type circuit is not too suitable because as the frequency goes up or down, the amplitude of the voltage across the capacitor changes proportionally.What circuit will allow me to convert a square wave directly to a triangle wave of fixed amplitude????

Question by -max-    |  last reply


Three anchors each side, bridge level with top anchor - best triangular design ideas, please! :7D?

Hello! I'm a bit stuck on making a stable, theoretical bridge. Rules: No one piece can be longer than 10, no shorter than 1. The bridge must span at least 8. Imagine a gully: \______/ There are three anchor points that you must use on each side - the highest is at the top, the lowest halfway down (not that that makes too much difference...). You have 80 pieces with which to build your bridges - please can you lend me your noggin's as I'm having trouble coming up with ideas that will bear a load. A regular suspension bridge or a tressle bridge won't work, as the joins for the pieces are not fixed solid - so you must use triangles / tension to support them. A bit like loose mechano, or whatever it is people have these days :7) Do they still have lego? I haven't seen a kid play with lego for ages... It's mostly P£3 and Sega Megadrives and stuff. tsk. Thanks! Claire. [ed] I just noticed a knex catagory. I guess that's mechano, right..?

Question by The_Saccade    |  last reply




A small doubt regarding modulation

Hi guys! I have a doubt regarding modulation process, more specifically regarding the spectrum. I understand the spectrum of sinusoidal signals, the amplitude or energy is concentrated at a particular frequency, say Fm, and hence the delta functions. But why is the spectrum of the unmodulated message(original) signal always displayed only in the shape of triangle? I have been going nuts over this question.  I have attached the images just in case

Topic by charmquark    |  last reply


How To Unscrew Three-Pronged Screws Without a Three-Pronged Screwdriver?

I have a Gamecube controller I want to take apart, but it has triangle screws. They're like Phillips (four-pronged) but only have 3 prongs instead. I don't have a screwdriver for this, so I need a way to unscrew them.EXAMPLEUPDATE: Not trying to be impolite, but I am NOT looking for a place to buy this kind of screwdriver. I am looking for a way to unscrew them WITHOUT the specific screw driver.

Topic by Aeshir    |  last reply


Help with making a triangle wave sequencer with pitch relative to tempo, please? Answered

I'd like to make a low frequency triangle wave oscillator/sequencer, but the oscillator and sequencer have to somehow be synchronized with each other, so that if the tempo gets doubled, for example, the pitch also goes up one octave. How can I do this? I've already made a circuit based on this oscillator and the 4017 decade counter as a sequencer. (Ignore all capacitor, resistor and pot values; I haven't defined them yet)

Question by aelias36    |  last reply


math fromula

Thought this would be an appropriate place to share some of what i thought was interesting information to do with the area of a triangle and how numbers co-relate. To round off a square to 100cm square, one quarter of that area is 25cm square, (10cmx10cm =100/(div)25%=25cm), the area of a  right angle triangle with sides measuring ~7.0710cm,  equals ~25% of 100cm square,  25cm square of area,  (7.0710/2=3.5355 x7.0710=24.9995205). 7.5937 if it is an equilateral triangle. it is a standard size i use,  a handy measurement if you use templates for construction because it in  some way represents a metric increment, thanks, Kim (the formula i used is half the base times the height,  unless im mistaken i recall that is the correct formula?  though i am not a full time mathamatician.  for the equalateral triangle i used a web based polygon area calculator.)

Topic by QSDR    |  last reply


Random Knex Challenge 1- Knex Triangle- WINNER!

Hey, this is the first of my many Knex challenges. I will post up a new challenge every saturday, and the winner of each challenge gets: EDIT- CONGRATULATION TO THE WINNER: SMILEE! A sub from me, 5* on all of their ibles, Favorites on all of their ibles, What else?? hmm... Anyway, its simple, try figure out how to make a perfect equilateral triangle out of Knex, and on the next Friday, I will decide who the winner is. Micro Knex pieces are allowed. But.... The triangle has to be as small as possible, if it is not as small as it can get, you dont win. Your answer can be a photo, an MLcad photo or just describing how its done. This challenge round will end on 27th November. Contestants in this round- -TheDunkis -(Atlas) -Smilee -Killer~SafeCracker -kNeXFreek -Recreate -The Jamalam Good luck! WINNER OF THIS CHALLENGE ROUND- COMPETITION NOT YET FINISHED

Topic by Hiyadudez    |  last reply


How do I build a wooden container in the shape of triangle? Answered

I need to build triangular pull out/roll out waste bins to fit into nooks in my kitchen. Two sides are 18" wide and the other (front) side is 16" wide. The bin should be 24" tall (I have 34" of clearance between floor and counter.) A square box I could handle. The triangle has me a bit unsure of how to screw everything together. Has anyone ever built a triangular wooden box?

Question by kamariden    |  last reply


best way to cut PET plastic bottles? #1 recycle triangle Answered

I want to improve the usb,wall warts,,technical cord storage trick that i think i saw here.they were using a toilet paper  tube.  i noticed that a lot of smaller Gatorade type PET bottles would work nice, since they are clear, and stronger.  i used scissors to cut some and get ragged edges, which i could fix, but i was wondering if a hot wire,like a styro? foam shaper would work better ? with the plus of smooth edges 

Question by escapefromyonkers    |  last reply


Geometric shape similar to sierpinski triangle, fractals that can be made with a ruler and pencil? Answered

Recently I've been drawing some aesthetically pleasing, kind of geometric shapes, most recently the sierpinski triangle. I was wondering if anyone knew of a shape or pattern in the same vein (can be drawn with just a pencil, ruler and a pair of compasses, and possibly other stuff like a protractor) that looks cool. Time is not an issue. Thanks in advance

Question by jamiec53    |  last reply



How do you use special characters in cmd?

I'm looking for the arrow (or triangle) symbols to put into a batch program. I know the alt # codes, but I want the codes compatible with ANSI. I have the down arrow, but it's an invisible symbol. Anyone know how to get them? (ASCII numbers are 16, 17, 30, and 31) Thanks!

Question by race.freak    |  last reply


How do I use this music synthesizer?

I downloaded this music synthesizer called Triangle II. I have no idea how the heck I use it. Can anyone help me?

Question by Jacko13    |  last reply


turn a square wave froma 555 into a sine wave? Answered

I would like to know how to smooth out a square wave to turn it either into a sine wave or at least a triangle wave. Or if it's not possible i would like to know how to make a sine wave generator to use as a lfo thing for a home made synth. Thanks, Josh1324 PS. It has to be analog, im not getting into microcontrollers or anything digital.

Question by josh1324    |  last reply


How would you go about making a wooden pyramid? Answered

I'm trying to make a wooden pyramid, preferably triangle based, but from what I can find square would be easier, with a specific sized face. I wanted the faces isosceles triangles with 3 7/8 in bases, 4 1/4 in tall, with base angles working out to be  65.5 degrees - the angles are important, the lengths can stand to be varied. I went ahead and made a mock up, but the 30 degree edge cuts left me with an odd sort of 3d kite instead of a pyramid. So how can design a pyramid with a specific face size, either triangle or square based.

Question by applesnacks    |  last reply


lollipop tree game? Answered

Looking for instructions to make 4 sided triangle lollipop tree for carnival sucker pull game Thank you

Question by HarveyThomas    |  last reply


How can I find the distance between these two points (D)?

If N1, K1, N2, K2, and C, are all known for me. Can I find D?. If yes then how?.

Question by MuhammadS34    |  last reply


Power Supply Question? Answered

I want to build a switching Power Supply, without the use of IC's with everything already inside. I only want to use op amps and passive components. Below are my goals on what to achieve. I would like to make this PSU current limited, or at least shut off when the current goes too high. I basically took the concept of the linear voltage regulator and expanded on it, turning it into a 'proof of concept' switchmode supply. Input Voltage range: . . . .7-24 Volts Voltage: . . . . . . . . . . . . . . 5-24 Volts Max Current: . . . . . . . . . .10 Amps Price: . . . . . . . . . . . . . . . . $5 -- $10         Instead of feeding a voltage reference into an op amp, I modulated it with a few components. (A triangle wave generator, and a array of resistors to lower the amplitude and introduce a DC bias.) The DC bias is controlled by the current protection module, which is simply an op-amp that reads the voltage on a small resistor and multiplies it by 5. This finalized current controlled, DC reference biased triangle wave is fed into a comparator, which will then switch a rather large MOSFET on and off at about 200 Hz, with varying PWM, depending on how much 'droop' there is on the output. Here is a rundown of what the components will do: OK, I refined my plan to this general specs: Input Voltage range: . . . .7-24 Volts Voltage: . . . . . . . . . . . . . . 5-12 Volts Max Current: . . . . . . . . . .10 Amps Price: . . . . . . . . . . . . . . . . $5 -- $10        I basically took the concept of the linear voltage regulator and expanded on it, turning it into a 'proof of concept' switchmode supply. I don't want to use any prebuilt chips where you have a magic black box with inductors, capacitors and resistors connected to it. I want this to be entirely raw, basic, cheap parts. Maybe later, I will replace many of the op amps with a single programmable chip (like an Atmega328P)         Instead of feeding a voltage reference into an op amp, I modulated it with a few components. (A triangle wave generator, and a array of resistors to lower the amplitude and introduce a DC bias.) The DC bias is controlled by the current protection module, which is simply an op-amp that reads the voltage on a small resistor and multiplies it by 5. This finalized current controlled, DC reference biased triangle wave is fed into a comparator, which will then switch a rather large MOSFET on and off at about 200 Hz, with varying PWM, depending on how much 'droop' there is on the output. Here is a rundown of what the components will do: Green field: This contains a voltage regulator which acts as both a 5V power source and a voltage reference. Not only will this module produce a 5V output, but also produce a triangle wave. Blue field: This module will be fed the triangle wave, decrease it's amplitude, and inject it with a bias voltage, controled by the current limiter (red field). Red field: This basic module simply measures current flowing through a 0.1 Ω resistor, and multiply that reading by a factor of 10, and inert it (the circuitry is probably wrong, and I am not sure how this will work, if it even will do what I want it to Will this work?) Yellow field: The final modulated triangle wave is then fed into the last comparator, which will switch a MOSFET on and off at a fixed frequency of 200Hz. The output of this last comparator is now PWM. As the output voltage sags, the pulse width will increase, and cause the final voltage to stabilize at either the peak value of the triangle wave (with little to no load), or near the bottom end of the wave (with a heavy load) ------------------------------------------------------------------------------------------------------------------------------------ My questions:  I try to run this in LTspice simulator but some reason the output of the last comparator is a distorted triangle wave. I think this has to do with my filtering capacitor and MOSFET gate capacitance. Can anyone give suggestions about this design?  I'm sure the current limiting function is not going to work as intended until I finalize it's design (I hope I don't need more than 4 op amps altogether, It would be nice to use a single chip I already have) Any suggestions? I might just omit this part entirely, as it is not necessary.

Question by -max-    |  last reply


How to automatically lift an object to an arbitrary angle?

How to raise the hypotenuse of the triangle to an arbitrary angle. I had a project like that but I couldn't do it because I was new to it. Tools in the project include inclinometer and servo motor. Please help me please. Sincere thanks

Question by DanhC2  


Fuzzy 20-sided dice

Fuzzy d20'sSo I bought a set of these about a week ago. I love them.But....They happen to be almost totally round, any ideas to make the triangles stick out a bit? Some way of giving it sharper corners and edges?Thanks!

Topic by reedz    |  last reply


3 Prong screw driver

I have a FujiFilm camera that is not working. I want to take it apart, but it has very small triangle screws all over the place. They have only 3 prongs instead of the usual 4. Where can I get a screwdriver for this? Can anyone help with this issue. Thank you

Topic by toolmanic    |  last reply


Sailboat Speed Comparisons

Portsmouth Yardstick is a rating system so different boats can race and supposedly the best skipper will win. It's a good way to see how fast different boats go around a triangle course.They've got hundreds of types listed and rated.I've written up some observations illustrated with videos here

Topic by TimAnderson    |  last reply


how do we perceive contrast in colors?

Does the human eye see more constrant in specific pairs of analog colors, comparing to other pairs that are equally (matematically in RGB) contrasted? looking at the triangle in the image, how do you feel the contrast between pairs of analog (neighbor colors)? are there pairs that are more constrant than others?

Question    |  last reply


How do you know if you have set a Oxy acetylene torch up correctly?

Im just wanting to cut a piece of flat steel and im wondering what to look for when setting the flame up on an oxy torch.Some people say until the feather is gone or until you have a blue triangle flame that is sticking an inch out. Im unsure.

Question by Aglife4930    |  last reply


Cardburg, the final days

If you're in the San Francisco area, try not to miss seeing Cardburg at Cell Space.http://www.cardboardinstitute.com/page2.htmlI was there last night and had WAY too much fun flying a cardboard helicopter on a string through the cardboard buildings. My friend taped some cardboard triangles to her back and stomped around as Cardzilla.(yes they are crappy cell phone pix, go see it in person!)

Topic by rachel    |  last reply


Puppy names!

Guess who got not one, but two puppies? :D And guess who has absolutely no clue as to what to name them? Yeah, that'd be me. So what do you think are some good puppy names? Here's a picture of them, one has an ear that sticks straight up and the other has an upside down white triangle on his forehead. Oh yeah, they're both boys.

Topic by Sunbanks  


What type of sled am I thinking of? Answered

Basically, I need plans for a sled that will be pulled by humans and should be about 2 feet wide, 8 feet long has triangle walls on the sides and then a rectangle in the front. It has skis on the bottom of it. If you just tell me the type of sled I am thinking of, that would help a lot. Have a site with plans for the sled I am thinking of? That would be even better. Thanks

Question by jacobdlyon    |  last reply


how to control servo motor(analog or digital servo) with ps2 remote and Arduino Uno r3?

Hello, I just want to control my servo Pan tilt with my ps2 remote and arduino uno R3. It means when i press the Triangle(Green) button it will move clock wise, and when i press X(Blue) button it will move counter clock wise. and this condition will true when button will press. unless it stop at current position.

Question by vrushank26    |  last reply


I am trying to sew pant inserts on a pair of too tight pants, getting stymied ?

I am trying to sew an insert on the outside hem of pants that are a little too tight. My fabric is a triangle shape & I am just trying to get the seams matched up correctly & wondering if there is someone out there that can help me, give a little instruction. I am stymied & already spent a long time working on this...thanks..

Question by narniamermaid    |  last reply


Can you help me find examples of modular building components?

So far I've found lego duplo kinex snobe origami bloxes http://bloxes.com/ drilled paddlepop sticks i also seem to have a memory of a rounded triangle shape in plastic/metal with bits cut out that you can attach together at right angles? no idea what they might be called. Any other suggestions out there?

Topic by wocket    |  last reply


Pump action crossbow with a mag

Alright, I've had this idea for like forever and I finally got a working prototype yesterday. It has a pump with two prongs on the side which catch the rubber band bow as it is fired and then pulls it back. The trigger is a triangle shape so the rubber band can slide over the top, but still be caught on the back. The system has a few kinks, but mostly it just isn't that smooth. I hope to work them out and eventually be posting.

Topic by DRADIS    |  last reply


Personal electronics theft prevention

My daughter is going into high school and has had her scientific calculator stolen for three years in a row at school. These are pricey, running from $30-$40 each. Besides that, all the other things in her pencil bag, like compasses, triangles, pens, mechanical pencils. Frankly, I'm sick of my daughter not being prepared for class and spending money for the reprobates to just steal it.  Is there any way to tag her calculator economically to track it down?

Topic by hugabugs    |  last reply


How to create wings for human flight?

All of us have seen humans fly in those triangle shaped gliders. How about creating wings that will do the job? Understood that it requires more than wind to propel it so flapping power could be harnessed.  I need designs and the physics(i.e How much area of wing is required to lift what mass of body and etc.) Please suggest solutions ASAP! My e-mail id is bharadwaj.adiraju@gmail.com Thank You :D

Question by bharadwaj.adiraju    |  last reply


Pyramid of Candy!

This was put together for my little sister's 8th birthday party :) Just get crafty type foam (like the white type for floral arrangements) and cut circles (or squares or triangles etc.) of decreasing size. Hot glue together....Then, hot glue on those fun sized candies (just a little dab). You know, the kind you discovered to be not so very fun unless you're eight years old :) This makes it easy for people to pull the candies off and keeps the arrangement nice and tidy.Vodka and Cranberry Juice for the adults.... kidding :P

Topic by trebuchet03    |  last reply


How can i make an outdoor mosquito free enclose? Answered

I already have a mosquito net. It is made specifically for mosquitos, but here's the twist. The enclose that i want it around is somewhat deep in the woods, and it is a tarp fort. The fort is made out of a tarp that is in between two trees and it is slanted. It's pretty much just a right triangle.  Pretty much all that i am asking is how to seal up the gaps in between the netting and the tarp.

Question by ducktape.mac    |  last reply


Hey...my psp is dead set .......Help PLZ.....!!

Um, hello and the topic is my psp is very dead......well i disassembled my psp to fix the screwed up button ribbon (you know, the X,O triangle square buttons.....) and i taked of the screen to remove the ribbon...its twisted and under so it was hard! well lets skip it......i was  removing the screen when that little brown thing that attaches the connection was broken....its tottaly screwed to the ground....dead...plz help me....

Question by justinx    |  last reply


Best way to cut corrugated plastic?

On the day after the elections, I collected a bunch of corrugated plastic political signs that were going to be recycled. My plan is to turn them into a small geodesic dome, similar Nasa’s Hi-Seas dome for my daughter to conduct scientific missions in the backyard.Is the easiest way to cut these signs into the necessary triangles with a razor and a straight edge? Can I use a circular saw or skill saw to cut them faster or cut multiples at once?

Question by Erfunden  


Dimensioned drawing for three-hole mount on A-frame trailer hitch?

I am trying to find the technical specs for the mounting hole that a powered tongue jack goes through on a A-frame trailer hitch. There's a big hole in the center for the tongue jack post, and three bolt-hole in a triangle around it. But what are the hole diameters and positions? P.S. I've gone through an hour or so of Google searching, and called three different "manufacturers." There are lots of trailer plans on the Web, but they're for-sale.

Topic by kelseymh    |  last reply


How oscillators work?

Why oscillators like wien bridge oscillator or RC phase shift oscillator gives only sinusoidal waves instead of triangle waves or square waves of particular frequency. Please dont explain about multi-vibrators . Also please say how to differentiate between low frequency oscillator and high frequency oscillator. By using any value of R(resistance) and C(capacitance) i will be able to get any frequency(high or low) by substituting in respective formula. But what makes one to judge a oscillator as high frequency or low frequency.

Question by deepakmurali    |  last reply


What's the best design for a water rocket?

There's two parts I'm wondering about: - fin design - recovery system design I'm planning to use angled fins. What angle is best? Does the shape of the fins matter, or can I just make triangles out of cardboard? For the recovery system, which is better: airspeed flap or "nose separates at apogee"? The second one is definitely easier to build, though.

Question by MePerson    |  last reply


Logitech Z625

I accidentally plugged these speakers into my outlet not noticing that the range of the speakers is 110v-120v. Here we use 220v. Later i tried to used a 220v to 110v converter but they didnt work. So i opened the subwoofer inside and it looks i have to change a sort of black transistor which exploded with a spark. In the circuit scheme it says D33 and in the center has two triangles facing each other. If you could tell me the exact type of diode or transistor, i could get a replacement to see if it can works. Thanks

Question by edvr84    |  last reply


Suggestions for simple scale drawing software? Answered

I'm used to the archaic way of drafting floor plans ... T square + triangle + canary paper + pencil and eraser.  I need software that will let me make scale drawings on the computer. I've tried ProDraw and another trial, but all the 'helpful' stuff keeps getting in my way.   I don't want to drag every line around. So does anyone know of a (hopefully free or inexpensive) simple grid & line & scale system that will let me draw the lines where  I want them to be?     I have photoshop elements 1.0 and love it.  But I don't see how to make scale drawings on it.   Thanks.

Question by mole1    |  last reply


How to make cuts for a child's jigsaw Answered

Greetings from a new Instructabler: I'd like to make some wooden blocks as well as some jigsaw puzzles and perhaps a lockbox for my daughter.  (She's six months old now so I have some time to figure this out.)  I'm thinking something like this for the puzzle (simple shapes and pegs for her to grab onto), and something like this for the lockbox.   I'm trying to figure out what is the fewest number of saws I have to buy to make all these things.  Seems like I'm going to need a band saw for the wooden blocks, but I'm wondering if I might be able to get away with it on the scroll saw?  This extremely helpful site describes using a band saw with a circle cutting attachment for arches and triangles.  Do I need a band saw for cutting 2 3/4" hard maple?  I'd likely have to just not make the 5 1/2" triangles if I went this route (which wouldn't be the end of the world). I'm a bit puzzled (as it were) regarding how to make the puzzle pieces and also the doors for the lockbox.  I imagine that if I didn't need the puzzle piece itself and just needed the outline then I could drill a hole in the piece, thread the scroll saw blade through, and cut the shape.  How do I make the cut that preserves both the puzzle piece and the surrounding wood?  Do companies that make these toys make the puzzle pieces (and doors) separate from the puzzle outlines (and lockboxes), or do they use lasers or something else? Your guidance would be greatly appreciated!

Question by statestraveller    |  last reply


Yeah, about my miter saw...

I know lots of people want me to post my miter saw, and I said I would. But I decided that I'm not going to post. It uses a lot of pieces, and only 3-4 people would be able to build it anyway. Sorry if your disappointed, but I did take pictures of it while I was taking it apart, so you'll be able to see the insides. I also included a parts list below if you're curious about how many pieces it used. :-)    Rods: 996 green-249 white-123 blue-347 yellow-96 red-34 gray-9 rigid tan-1 rigid black-1 flexi-rod (yellow rod length)-12 flexi-rod (gray rod length)-68 orange-56 Connectors: 804 dark gray-15 light gray-34 red-232 green-33 yellow-171 orange-59 white-74 blue-81 purple-179 Panels: 29 triangle mini-12 triangle small-16 square small-1 Other: 205 chain link-33 blue spacer-31 silver spacer-66 tan clip-18 metallic blue clip-15 black Y clip-5 red gear-8 small blue gear-2 orange splicer-12 battery-powered motor-1 tire-6 black snap cap-3 rubber band-3 fishing line-2 strands Total: 2,034 Here's some pictures of the saw's deconstruction and pieces.

Topic by Shadowman39    |  last reply


Dry-Ice Martini and Electric Cake - Hungry Scientist and Instructables in the NYT

The Hungry Scientist Handbook, Turkey tek, and Instructables were the topic of Dry-Ice Martini and Electric Cake in the New York Times:WHEN does a recipe become a science project?Is it when the compulsion to create an edible electrical circuit keeps a cook up all night, wrapping Twizzler string licorice in pure silver?Is it when a baker decides to bake 20 equilateral-triangle-shaped pecan pies for Thanksgiving, then attach them together with magnets to form an 80-serving icosahedron? (The recipe begins with 30 cups of flour and 2 large sheets of 24-gauge steel.) More news and press about Instructables here.

Topic by ewilhelm    |  last reply