WAT.1 paper airplane contest August [Extended] [1] [open] - Paper Airplane Start Power Launcher

This is a first weekly contest. Requirements: Can make the Paper Airplane Fly 70 feet up the air. A paper airplane launcher.  Instructables requirements: Need a "How to launch it step" before the first stuff step. To enter: Just put your instructables URL in the comment. 1st: A weekly patch from me and a message tipping. 2nd: A 2nd prize message. 3rd: A 3rd prize message.

Posted by wat. 7 years ago

I'm back! And I've got a challenge for you!

Hello Instructablonians! I'm back (at least for the next few weeks) since it's winter break!  MIT is fantastic, and I've learned so many incredible skills that I think I'll be able to participate in my new challenge. The Challenge:    * Your job is to produce about one (quality) instructable per day for the next 11 days.  Instructables are allowed to be backlogged (ie. do the project in one day, take the pictures, but wait to write the instructable), so long as they are posted by January 17th.  I'll also give you 1 day of lee-way, so you only have to make 10 ibles total to qualify.  Make sure that you tag your instructables with the keyword 'muffinchallenge09'. The Reward:    * Ever want pseudo random components that can fit in an envelope?  If you're in the US, I'll send you a letter with a card and some components you can pick from a list that I'll post when the contest is over.  (Mostly stuff like LEDs, old logic components, maybe some FETs or BJTs, crystals, etc.)    * A Muffin Challenge Digital Patch of Approval!    * The satisfaction of being incredibly productive this season. So get to it!  Happy Snowydays for everyone in the Northern Hemisphere! -muffin p.s. How to catch a bird at the top of a mountain?  :-P

Posted by T3h_Muffinator 8 years ago

What could it be...?

Hmm... PADBHAR? 9R per B. 2S per P. Hmm... [Bipod too, but that aint made yet] Pump action double barrel heavy assault rifle. 12 rounds per barrel. 2 shots per pump. Can fire one at a time or both at once. Removable Magazine/Hopper/Stripper Clip. Bipod to come.

Posted by ajleece 8 years ago

One laptop per child?

So i saw this story on 60 minutes a couple days back. One story was on having one laptop per child. so they tested it in a 3rd world country. It seemed like a great idea.and no need for electricity to charge the laptop they had hand cranks for it which also seemed like a great idea. So do you think having one laptop per child is a good idea

Posted by Easy Button 10 years ago

Where to get LEDs in the USA for low cost per led???

Hey everyone, where can i get some LEDs in the USA from a manufacturer? max price per led is 11 cent! please help. kingbright is a little o the higher side. :(

Posted by led235 9 years ago

How many people get on instructables per day?

My friend was asking me how many popular Instructables was so I came to you guys.  How many people get on Instructables per day and how much money do you think they (Instructables) make by advertising and stuff.

Posted by larslovespeace 7 years ago

Reply Button Doesn't work, neither does the instructables per page

Hey! Just want to let you guys know that on the MAC (Chrome and Safari) the reply button does not work. I have to refresh the page a whole bunch of times before it works.  Also, in Safari, the instructables per page (15, 30, 60, 90) does not work. It only shows 15 per page, and I can't change it. Thanks!

Posted by HavocRC 5 years ago

continuous to step rotation in legos?

I have a thing that rotates in lego, it has one revolution per 5 minutes. I want it to be connected to something else so that the other thing has one rotation per hour. But it has to rotate in steps, so after every five minutes it has to rotate 1/12 revolution at one time. Can anybody think of a good mechanism? It won't work to make only one pin on the five minute ring so it only ticks the other gear one pin per rotation, that would go too slow because with one revolution per five minutes the transition would take too long. It has to be a short moment. thanks

Posted by merijnvw 8 years ago

90 per page "favorites"

(I m not sure if this is the right place to post this, if is not please give me a suggestion). I was just wondering if it would be possible to make the page of the "favorites" so that the people could choose to see 90 favorites instructables per page (like when you look at the "recent" instructables page, for example). I was thinking about this because I have many "favorites" and it really take long time to arrive to my last page (with only 15 instructables displayed per page)....or maybe be able to organize them in diy folders (food, bike, wood...). I don't have really any knowledge in computer so I' m not sure about how much work this will take...

Posted by marcellahella 5 years ago

Can only download 1 PDF per session.

I cannot download any PDFs after I have downloaded the first one.  When I select additional PDF downloads I get a blank (grey) page which stays. My download "advisor" does not show any download activity - after the first DL. Also, Editor's picks and other choices just produce lines of code.

Posted by UTRBC001 7 years ago

Instructables Partnership?

Has Instructables considered a partnership program like YouTube? Like a 'pay per hundred views' program for more popular users.

Posted by Chikpeas Brother 4 years ago

Thanks for the new feature!

Ibles was down earlier for "maintenance". I just spotted what they changed! Thanks for updating the comments as per Fungus' suggestion, much prettier!

Posted by Jayefuu 8 years ago

How To Know Which LED Strip I Have?

I  bought some LED strip from eBay for lighting beneath shelving and since then I've been learning about what's needed to run them.  First thing seems to be to know the wattage and that depends on the type of strip:  SMD3528 or SMD505, apparently. One of them drawing 0.08w per LED and the other a whopping 0.24w per LED.  How can I look at what I've got and know which type it is?

Posted by abrogard 5 years ago

know somethen about making a webpage?

Ok so im thingking abount making a webpage but i have a question...you know those PPC (pay per click) things you can get from like google.com? well technicaly couldent somebody just click on the links 100 times and make money, or is it only a one click per person kinda thing? oh and im not trying to rip google off or anything i just had this random thought

Posted by yuckzee 9 years ago

Bait & Switch

Thanks for the Bait & Switch.... Page prices for quarterly are shown as $3.95 per quarter. So I selected it, as it would be cheaper than the 2 year term over the same period. Got to checkout and it was switched to $11.95 a quarter.....so I was forced to purchase the 2 year plan....trying to save a few dollars on the subscription you know. Feel free to refund the difference between the $3.95 per quarter(advertised on your site)  for 2 years opposed to the $39.95 I had to pay. THANKS AUTODESK!

Posted by r4n 6 years ago

Nuclear power costing

I am doing the cost of electricity for a nuclear power plant and was wonder if this costing equation seems right:  Take a plant at the cost of $ 7 billion and produces 1100 MW of power 7000000000/1100/1000= $ 6363.63 per kW Normally the life cycle is 40 years and a weighted average cost of capital is 14.50% So 6363.63 kWh * .1450 = 922.72 The typical capacity factor ranges from 75% to 85% so the average will be taken 80% This capacity factor is then multiplied by the number of hours in a year which is 8760 0.80 * 8760= 7008 kWh a year the plant is running So: 922.72/ 7008 = 0.132 which is 13.2 cents per kWh. Operation and maintenance costs with fuel is estimated at 1.5 cent per kWh Property taxes is at around $0.02 cent/kWh Fuel cycle is at around $0.03 cent/ kWh Waste cost and the decommissioning costs together are 0.02 cents/ kWh So the total cost stands at around 21.7 or 22 cents per kWh ive done another equation out for 3rd generation reactors that comes out at a lower cost. does this seem right? i am not sure how to work out the weighted average capital cost % (that was a figure i took from a site) i will be grateful for any reply

Posted by rich5007 7 years ago

Adapting LCD Active Shutter Glasses (3D Glasses) possible?

Can you take a pair of Active Shutter glasses, ie. Samsung and adjust how fast the glasses are flashing (They usually flash around 92hz (48hz per eye), I was wondering if you could drop that down to 4-6hz per eye(8-12 hz overall)Is this possible? With a the circuits and timers?Any ideas on how to do this?Thanks

Posted by bethekind 2 months ago

site navigation

Do you think that the site could be easier to navigate? i think that if you could choose how many items were listed per page e.g. instead of 20 per page, you could have 100 or more. it would make it easier because you would'nt have to click next page as many times. another thing to make the site easier to navigate would be if the names of the 'ibles, questions ect were listed in each category in alphebatical order, so that you could easily find an instructable by name.

Posted by RedScoutMonkey17 6 years ago

LED trigger for small bots...Voltage per color?

I know I have seen it somewhere, each color of FLED's provide a different trigger voltage for solar bots. I just read through my books but it is nowhere to be found and all the websites I have searched just say there is a difference but do not give specifics. Somebody has to have the specs... Yes I know a 1381 is a much more efficient way but they are near impossible to find and I'm not looking to race it's just for fun. Thanks in advance, m3lt

Posted by m3lt 9 years ago

Ideas for how to make a kinetic pin wall door

Http://youtu.be/F88D-eQMC9c The concept was to take the pin walls that you see at museums and science centers and make a kid's bedroom door out of these push pins.   From talking to manufacturers it appears to be a pretty pricey proposition (.25 cents per pin / approx 55,000 pins per 4x4 area). I was wondering if anyone had any ideas how to make this more economical?  Or if it had already been done and there was an instructable already out there? Thanks!

Posted by msmith94 6 years ago

Amateur Chemistry is Dead. :-(

You're now restricted to one pound of fertilizer (or other chemicals that might be usedto make illegal fireworks) per year.Judge's Final OpinionDamn.Background info for Firefox vs CPSC

Posted by westfw 11 years ago

New Instructables

Killer Video of the Gatling Gun. I'm revealing my coming instructable. I will publish a heavy duty 16 shot Gatling gun that shoots 10 barrels per second. When 3 green pegs are in each barrel it shoots 30 bullets per second. I shot a total of 48 pegs in the video. Look for that in a month or two. Hope you can't wait. NO PICTURES YET. IT'S TRUE IDENTITY WILL REMAIN A SECRET UNTIL IT IS PUBLISHED. ALL YOU WILL SEE IS IT'S MASSIVE FIREPOWER.

Posted by Electroinnovation 9 years ago

Plywood Challenge: Bike Polo Arena

The chain link fence around our Bike Polo arena  needs a 1' high runner at ground level. You can't bounce a Polo ball off a fence. I've found over two THOUSAND small 12" x 18" x 1" plywood  pieces (hardwood, not OSB) . At $0.25 apiece, these are 1/10 the cost per square foot of Home Depot! What is the CHEAPEST way you can think of to permanently join 8 pieces in a row, edge to edge? You have $0.50 per join. You must be able to lift the assembly and smile, confident and proud of its rigidity.  Already thought of: Gluing (biscuit, tongue and grove, etc): Lots of work, might work with the right process. Sandwiched between sheets (HDPE, HIPS, PC, etc): Expensive, >$1 per ft^2 Webbing, Jacob's Ladder style: Webbing ain't cheap

Posted by Marathon 4 years ago

Zero to 300mph in 30 seconds. On two wheels.

Meet the world's fastest ever road vehicle built to reach an astonishing top speed of 340mph.The Acabion GTBO uses jet fighter technology and aerodynamics to reach its extraordinary speed propelled by a state-of-the-art turbo-charged engine.Its designers revealed it could reach 300mph in a blistering 30 seconds - substantially quicker than the rival Bugatti Veyron which takes 55 seconds to reach its top speed of 250mph.Good grief, that would rattle your teeth!The article implies that an electric version is in the pipeline as well.Daily Mail story750 hp and 700 lbs vehicle weight result in more than 2100 hp per ton. They boost the jet-like GTBO to jet-fighter punch and to new dimensions of both efficiency and speed.V-max 340 mph at half throttle, governor limited.0 to 300 mph in less than 30 sec.Economic theories tell us, that you can not maximize effect and minimize effort at the same time. The Acabion GTBO proves the opposite. It minimizes weight and maximizes power and aerodynamic efficiency. The effects are just out of this world.100 mph at 1.7% throttle and 100 miles per gallon.150 mph at 4.3% throttle and 62 miles per gallon.250 mph at 17% throttle and 25 miles per gallon.Acabion websiteMore photos at Jalopnik

Posted by Kiteman 10 years ago

Oil: $100 per Barrel

Twas bound to happen - so why not open the new year with a new high?http://money.cnn.com/2008/01/02/markets/oil/index.htm?postversion=2008010212U.S. crude for February delivery jumped $4.02 to $100 a barrel on the New York Mercantile Exchange before slipping to $99.42. The previous trading record was $99.29 set Nov. 20. Oil prices ended 2007 by gaining nearly 60 percent for the year, the largest jump this decade."This market is really gonna fly," Ira Eckstein, president of Area International Trading Corp, said from the NYMEX floor.In Nigeria, bands of armed men invaded Port Harcourt, the center the oil industry Tuesday, attacking two police stations and raiding the lobby of a major hotel, The Associated Press reported. Four policemen, three civilians and six attackers were killed. The Niger Delta Vigilante Movement claimed responsibility for the attack.At 2.1 million barrels per day, Nigeria was the world's eighth-largest oil exporter in 2006, according to the U.S. Energy Information Agency.Furthermore, the auto manufacturers are saying the new CAFE standards (35mpg for cars) are a very expensive goals. Mind you, there's cars 20+ years ago that exceeded this standard (CRX got in the mid 50mpg range).Futurama did elude to $100 per gallon of gas in New York city by 2012... How could they be wrong? :D

Posted by trebuchet03 10 years ago

Excessive Conservation Wearing Out [noun]...

So... While brushing my teeth - I first rinse my brush, turn the faucet on, brush, then rinse the sink/mouth. Yes, I turn the faucet off while brushing. And if you're counting - that's two on/off cycles per brushing...I've been playing with this tool: http://www1.eere.energy.gov/femp/procurement/eep_faucets_showerheads_calc.htmlAnd I pose an open question for discussion.. But first, my data/research...I'm estimating 3 minutes of use per day - 365 days/year. According to the tool... I use 2190 gallons per year. Lets say that's 5 uses per day (2 for teeth - 1 for bathroom use). The tool seems to estimate an 8.4 year service life - so that's a total of 18396 gallons of water over it's life as a faucet.So If I leave the water on while brushing - that's 3 on/off cycles per day.butIf I turn the water off while brushing - That's 5 on/off cycles per day (40% more cycles).Realistically, a faucet's wear comes from on/off cycles - each use bringing it closer to retirement. So 40% of 8.4 years is 3.4 years.Now... Leaving the faucet on an extra 4 minutes per day (2 minutes per brushing) consumes 2920 gallons of water per year.The difference over 8.4 years is: 30660-18396=12264 gallons. At about $4 per 1000 gallons - that difference is $49.06. BUT, the direct replacement for my faucet (as priced today in home depot to the exact model) is $75. So after 8.4 yearsFaucet remaining on will cost me:$49.06 + $75 = $124.06Faucet being turned off will cost me:$75 + $30(prorated cost of faucet for 3.4 years of wear on a new faucet) = $105Differences:$19.0612,264 gallons of waterThat is to say - due to extra wear on my faucet - it's only marginally more economical to turn my faucet off while brushing my teeth. If I wasn't me, and not able to DIY replace - it very well may be cost effective to leave it on given the cost of a hiring a handy man or plumber...Okay... Now that you've read the above... please discuss your thoughts. I am very much aware of the assumptions I have made (no need to point them out) - just looking for opinions :)UpdateLets turn this discussion on it's head now... As several have pointed out, conserving is more important - bonus as it's close to an economical wash in my fictitious scenario above (it's not 100% real and based on data from the link above and some hefty assumptions).My car uses .3 gallons of gasoline per hour at idle. Lets take a 100% city drive in heavy traffic (my drive yesterday). I was at a complete stop due to traffic lights or traffic for 20 seconds or more a total of 12 times to travel ~10 miles (yes, I freakin timed it). So that's a total of 4 minutes (wow, that worked out nice) of idle time. That time consumes 0.02 gallons of fuel costing me $0.06. If I were to make that commute 5 days a week, twice daily - that's a cost of:10.4 gallons of gasoline$31.2 worth of fuelSo, a new starter for my car costs $130. Typically the motors don't actually die - just the contacts. But lets assume I don't want to fiddle with that and just want to direct replace (corollary to valve washers :D).This means - using my starter an additional 24 times per day - it will take 4.2 years for the fuel savings to pay for a new starter. In 4.2 years - averaging 12,000 miles per year - I will have traveled 50400 miles.Okay - now lets consider the cost of fuel to restart - 24 times.... According to mechanical engineering magazine, a V6 engine used 5 seconds worth of idling gasoline to restart. So - redoing some math to compensate - that's a savings of7.8 gallons of gasoline per year$23.4 per yearTime to recoup 1 starter: 5.6 years (equating to 66000 miles)So, I'm having some problems finding data on starter life cycle - all I have is anecdotal evidence... *My personal car has 115K miles and is ~8 years old - and I've been doing this since I bought the car >2 years ago. *My last car was sold at 98K miles and this was done for a little less than 2 years (the car was 8/9 years old when sold).*My first car had unknown mileage (estimated around 150K), was 10 years old and the engine was killed at stoplights.*My parents own a conversion van (seldom used now) that is 12 years old, 120K miles - did not shut the engine (v8) down at traffic lights.None of the cars above have had their starter go.*Father had a truck that had it's starter replaced around 220K miles - unknown age. That car left us with a blown connecting rod around 300K milesBatteries... Yes, this does put more strain on your battery... I'll go more into that when I can find some better data (more than anecdotal :p)...But, that's to say... It's economically viable to turn off your engine at traffic lights... So much so, it's illegal to idle (over a certain period of time) at traffic lights in some countries...

Posted by trebuchet03 10 years ago

What Grocery stores have the most reasonable prices for turkeys per pound?

Seeing that the economy has gone absolutely crazy with the outrageous prices for food!!!! I would like to ask my fellow community members if you have noticed any grocery stores who are having good deals on turkeys per pound? I live here in Northeastern Ohio and at Save a Lot(Discount food store) a turkey was $1.79 a pound. Please can somebody possibly give me some feedback on how a family of three can have a decent meal without spending my whole paycheck?

Posted by jadan1223 9 years ago

Battery operated led with 6 hour run time per day.

Trying to figure out how to make a circuit for a LED light that is run by two AA or two C batteries. I would like the light when turned on to run for 6 hours and then turn off. Then autmatically turn on the same time each day and run for 6 hours without having to manually reset the light. Having a hard time trying to figure out how to make this timer. It would also be a bonus if the the led flickered like a candle. Thanks for any help in the right direction.

Posted by pdub0626 9 years ago

betacup contest - slideshows / video entry

Per the contest rules it says "The rules are simple: submit a new Instructable that reuses a paper coffee cup in some way". This is clear enough for me, however just to make sure are slide shows and videos exempt?

Posted by mikeasaurus 8 years ago

Make supercapacitors from graphite in a DVD burner

The outline is that you can deposit graphite oxide (a cheap bulk material) onto a film of PET (the plastic used in Coke bottles), hit it with a commodity infra-red laser (such as the one in a $30 LightScribe DVD burner) and end up with a form of activated carbon material that can be used as the electrode in an electrolytic capacitor.  Add some aluminium foil, separator membrane and electrolyte and you've got cheap, robust energy storage.  The headline numbers are a few hundred milliFarads per cubic centimetre at a few volts, which works out to 1.36kWh per cubic metre of stacked capacitors.  It's still about 50 times less energy per volume than lead acid batteries, but you could store as much energy as your house will need overnight in the size of a garden shed or a set of bunk beds.  They charge/discharge in seconds and retain >95% capacity at 10,000 cycles so seem suitable for storage to even out intermittent energy generation from, for example, solar or wind power. I'm really thinking about cost here- unless I'm missing something fundamental it doesn't seem like producing these on a high volume roll-to-roll process would be excessively difficult, and the cycle life means the replacement time would be many years even in heavy usage.  Could you get sufficient kWh per dollar to make these a viable storage mechanism for home-scale renewables? There's a more informative article here.

Posted by PKM 6 years ago

Garlic as health booster

From Unlocking the Benefits of Garlic in the New York Times:The power to boost hydrogen sulfide production may help explain why a garlic-rich diet appears to protect against various cancers, including breast, prostate and colon cancer, say the study authors. Higher hydrogen sulfide might also protect the heart, according to other experts. Although garlic has not consistently been shown to lower cholesterol levels, researchers at Albert Einstein College of Medicine earlier this year found that injecting hydrogen sulfide into mice almost completely prevented the damage to heart muscle caused by a heart attack."People have known garlic was important and has health benefits for centuries," said Dr. David W. Kraus, associate professor of environmental science and biology at the University of Alabama. "Even the Greeks would feed garlic to their athletes before they competed in the Olympic games."Now, the downside. The concentration of garlic extract used in the latest study was equivalent to an adult eating about two medium-sized cloves per day. In such countries as Italy, Korea and China, where a garlic-rich diet seems to be protective against disease, per capita consumption is as high as eight to 12 cloves per day.I read this and immediately thought, "1-2 medium cloves per day! Christy and I probably eat that much in a single serving!"Try upping your garlic with these awesome recipes:Roasted TomatoesRoasted Eggplant with GarlicRoasted Sweet PotatoesGarlic Mashed Potatoesand here are some more recipes with lots of garlic.

Posted by ewilhelm 10 years ago

'Revolutionary' CO2 maps zoom in on greenhouse gas sources

Researchers now have a better view of where carbon dioxide is being emitted thanks to Vulcan, a research project led by Kevin Gurney, an assistant professor at Purdue. This map shows where CO2 is being emitted in the continental United States in 10-kilometer grids and combines data from sources including factories, automobiles on highways and power plants. The map offers more than 100 times the detail of previous inventories of carbon dioxide. The image displays metric tons of carbon per year per grid in a logarithmic base-10 scale.more at Physorg

Posted by ewilhelm 10 years ago

WARNIG: New technology discovered! Air powwered weaponry.

A new research has been discovered in the K'nex world. We have made great strives in air powered projectiles. I recently have been secretly working on air tight hoppers that can be quickly re-loaded and shot at high ft. per second.I'm expecting 6 shots per second20 ft at the least. Easily removable hoppers.I'll take guesses on how I'm going to do thisi know this question will be asked "is it going to be all knex?" Yes it wiill be all knex except for I might have to use mc. donalds straws or pen tubes.

Posted by the_burrito_master 9 years ago

Need Help Finding a Servo Motor...

I need help finding servos that are similar to these (sadly, it doesnt look like Conrad Electronics ships to the US). i cant spend more than $10 USD per servo and the site has to be able to ship to the US.

Posted by REA 7 years ago

Fancy $103,000 per year, for three hours work a week? YOU CAN APPLY (update: if the site hasn't crashed)!

Tourists chiefs in Queensland, Australia, need somebody very special.They are looking for a caretaker for a tropical island.No formal qualifications are needed but candidates must be willing to swim, snorkel, dive and sail. In addition, you will be expected to feed fish, collect the mail and maintain a blog. The job is expected to entail approximately twelve hours' "work" per month.In return, the successful applicant will receive a salary of A$150,000 ($103,000, 70,000GBP) for six months and get to live rent-free in a three-bedroom villa, complete with pool. The job is being advertised around the world. Candidates have until 22 February to submit an online video application. In May, 10 shortlisted candidates and one wildcard, voted for by visitors to the Tourism Queensland website, will be invited to the islands for a four-day final interview process. The successful candidate will start the new job on 1 July. Apply hereUPDATEThere have been two thousand video entries already, and the site has crashed under the traffic-load.Story

Posted by Kiteman 9 years ago

12kj coilgun project

Hello I am working on a new coilgun using 15 10000 uf 400v 17200 ma capacitors. The accelerator is 5 stage, while using 3 caps per stage each stage will have 2400j of energy. I will be posting updates on this forum every month or so. my current setback on the project is charging what I am wondering is what input current and voltage and output current would I need to charge 3 caps decently fast. once that is solved I will line up 5 in parallel to charge all (1 per stage) if I need to line up a greater amount of a lower rated circuits I will.

Posted by ThinkDesignConstruct 3 years ago

spec a dc motor for a vehicle

I am making an electric vehicle. Assume no friction on a flat surface. The vehicle will have two dc electric motors preferably 24v or 48v system as space is an issue(about 3.5 x 4 feet) one motor on each drive axle. The vehicle will weigh 2000lbs have a max speed of 10miles per hour be able to reach max speed in under 5 seconds overall wheel diameter will be 16 inches Can be geared down to attain needed torque but must go up to 10miles per hour. Please include formulas so I can at least know how to do this in the future. I need to know power, torque, rpm needed for electric motor. Thank you

Posted by tshaf 10 months ago

Printing your 3D file (5€ start price) !

Hi everyone, I'm a french student and I created a 3D printer. I can print a lot of objects (like prototype part). I want to do that for improve my stuff, and in the future I would work in the 3D printing. I can print in Yellow ABS and Grey PLA. Price; Only 5€ per part + 0,35 per cm3 of plastic. (+ shipping cost) (up to 20cmx20cm) You can use my hub to order or ask me question ! https://www.3dhubs.com/lille/hubs/jimmy Thank you and have a nice day

Posted by jimdu62100 3 years ago

Does Instructables.com track where their traffic is coming from?

One of my instructables has received several hundred hits just today.  It usually gets about 20-30 hits per day.  Is there a way to tell where the traffic is coming from? Thank you, Annabelle

Posted by HandmadeByAnnabelle 5 years ago

arduino Questions

Silly question. Trying to build something that requires an arduino to take a temperature measurement, and pwm an Item dependant on that temp reading. so the question is how many reads and adjustments per second can I aim for? I was hoping to get the 1 MHz area but am assuming less than that at this time

Posted by plucas1 1 year ago

Where to buy JB Weld

I tend to do a good bit of research when I purchase anything. I will spend hours finding the deal that will save me five cents. While this doesn't make much financial sense for me, maybe it will end up being worth it if you can save a few cents in the process!The only step to this instructable is a list of the best places I've found to purchase JB Weld. For those who are not familiar with JB Weld, it is, simply put, God, in a tube. It is an epoxy that when mixed (and mix quickly, you only have about 20 minutes of pliability) will set within 4-6 hours, and cure within 24. Once cured, it has the strength of steel, can bind with glass, and neatest of all, is actually conductive enough to use as solder!Note that I'm only referring to the original JB Weld, model 8265 (and 8265-S). I find the stick version doesn't adhere as well, and the "Kwick" version isn't as strong. I also tend to be stubborn and just stick with what I'm comfortable with.Since the invention of Duct Tape (genuflect) nothing has been so valuable to mankind. Thus, it's not surprising to find it anywhere from $9.99 a tube, up to $14.99 per tube. So how much should you be paying for your J.B. Weld?If ordered online, you can get it for as little as $2.95 per tube!Note: These prices are only accurate as of the posting of this instructable (29 June 2009)Okay, so if you've come this far, $2.95 per tube sounds pretty exciting. Keep in mind though that you're also going to end up dealing with shipping, so we'll see what the end result will be. When in doubt, if you have a local Ace Hardware, Lowes, Home Depot, etc. look there first. You avoid shipping, and the Ace online outlet sells it for as little as $3.25 per tube (No idea why nobody else, including Sears, KMart, Target, etc. carries it online). If you can find it in the store for that price, that would be your best bet. But assuming you don't have a local Ace Hardware, or since they're locally owned the Franchise Owner is a prick that overprices things, let's see how the following websites work out.First, it's important to note that while you will find many other places online that claim to sell the JB Weld for as little as $2.95 per tube, just try to purchase them. I'll wait... Back? So as you saw, 99.9% of these sites use the Amazon.com checkout system, and only allow ONE TUBE AT A TIME to be purchased. They then hit you with a $4.99 shipping fee for each pop, and now you're back to paying $8 per tube.On to the real suppliers:#1) Tool Explosion - The best price I've found with free shipping, but their free shipping minimum purchase is $100, and their JB Weld was only $3.76 per tube when last checked! One of the better deals out there. Between $100-$130 worth, this was the best deal I could find.#2) Alexandria General Supply - To get the $2.95 price here, you have to buy in 6 packs, otherwise it's more expensive. But hey, more JB Weld can only be a good thing. They seem to have a starting-rate of $17.05 for shipping, which is nearly as much as the 6-pack of JB Weld, making them almost $6 per. However, the more you order, the price of shipping will actually start to go DOWN. At 7 cases (42 tubes), it dropped to $7.41 for shipping making it $3.12 per tube, and at 20 cases, it was only up to $8.16 for shipping, making bulk purchases very much worth it. At $131.31 for 42 tubes, this was the best deal out there, and only gets better the higher you go. They do not accept PayPal, but do accept all major credit cards.#3) Ace Hardware Outlet - Don't ask me why AceHardware.com doesn't carry it, but AceHardwareOutlet does, but I'm not going to argue. At its respectable price of $3.39 per tube, it's not a bad deal if you're buying in bulk. Unfortunately, for just a single tube to ship, you're looking at $6.39 for shipping. The shipping rates only slowly go up the more you pile on, so if you're doing some shopping for some other hardware, Ace is The Place... For Me... (Plus, they take PayPal!) For individual tubes assuming you can't find anything locally, this is the best price going. At least buy 2 or 3 tubes at a time to make the shipping worth it, though.#4) Hands-On Tools - Another site with fair shipping, and a decent price of $3.66 per tube. Not much to say about this one, except that they seem to be one of the more reputable sites selling the weld for a good price. They work with the BBB and have a good rating, accept PayPal, and give you percentage discounts the more you buy. All around a solid company.#5) Castle Wholesalers - One of my personal favorites (since they are located near me, mostly) selling the JB Weld at $3.47 per tube. However, do keep in mind that you have a $25 minimum order here. Their prices are pretty standard for shipping, so you can add about $1 per tube once you've bought the requisite $25 worth. The more you buy, the cheaper the shipping gets per tube, as well. Only Visa and Mastercard accepted.#6) College Toolbox - While their price isn't the best, it's still a fun site with some decent stuff at fair prices. At $4.11 per tube, it's not necessarily worth the purchase here unless you find enough of their gear to get the "$150 purchase gets free shipping" thing. (And they take PayPal)In closing, if needing just a tube or two, your best bet is always going to be to shop locally, and buy from a hardware store. But once you start getting into the $5 and $6 price range, there are some decent places online to pick it up (if you don't mind the wait). Always take shipping into account, and always avoid Amazon.com and their Affiliate's rip-off schemes. If you see the Amazon logo, run far and fast (or at least close the window). E-Bay is equally a rip-off, only moreso as you're starting at the $9.99 level, and then tacking shipping onto that.For the hobbyist that understands the glory that is JB Weld, drop the $130 and get enough JB Weld to last you for a long, long time. For all others, I would recommend avoiding purchasing it online unless you absolutely can't find it for a fair price in your local stores (I can't stress that enough. Shipping is the debbil.)Hope this helps someone, and if anyone finds a better price, feel free to include it in the comments and I'll add it to the list!

Posted by Javin007 9 years ago

The difference between 1200 fps and 1000 fps (frames per second, not feet per second or first person shooter)

I'm currently deciding between two cameras, well three actually. The EX-F1 http://www.amazon.com/Casio-EX-F1-2-8-Inch-Digital-Stabilization/dp/B001FR2W9Y/ref=pd_cp_p_0 Which can be found for $1,000 and the EX-FH20 or EX-FH25. Both are practically the same. They cost about $300 www.amazon.com/gp/product/B001HCTKZQ I think I should get the EX-FH20. The only real difference is 200 fps. This is only a 20% increase. At the speed of sound or 340.3 m/s filming across one meter, the difference between movement in frames per second is only 2.236 inches. 340.5/1200=.2835 340.3/1000=.3403 .3403-.2835=.0568 meters, or around 2 inches. I'm not going to deal with the speed of sound anytime soon, so I think the EX-FH20 should be fine for my needs. It also means I can get http://www.amazon.com/Canon-Digital-Camera-18-55mm-3-5-5-6/dp/B0012Y6HC8?ie=UTF8&s;=electronics&qid;=1201176487&sr;=1-2      

Posted by starwing123 8 years ago

Category selection in rss feed

It would be great to have one RSS feed per category (as defined in "Explore"). There are so much posts in "food", not interesting at all for me, cluttering up my rss reader, that I seriously envision to unsubscribe from  instructables feed. I'm tired of filtering them every day.

Posted by elkar 6 years ago

Odds and Ends

This is a store to sell off some of my junk and to sell kits for my instructables: Steel wire: 2$ per yard for my thick wire and 1.50 for my thinner wire. 3/8 inch thick by 3' long steel pole: negotiable more to come pm me with orders

Posted by instructoguy 9 years ago

Follow the bouncing ball!

An article in PhysicsWorld reports on a novel technique for measuring the acceleration due to gravity. The researches used a cloud of ultra-cold atoms and bounced them off a series of upward laser pulses. By measuring the timing of the bounces they could measure g with better than 1 per mil precision.

Posted by kelseymh 9 years ago

Where Do You Get Your Rubber Bands

I'm sure you all hate replacing rubber bands, so where do you get yours? Are they strong, weak, or average, and how much do they cost per hundred?

Posted by Electroinnovation 9 years ago

Too Many Groups!!!!!

In some categories there is too many groups. For example if you look up knex on groups you get 11 pages of result. There is about 20 results per page so its over 200 possible knex groups you could join. What do you think?

Posted by Masterdude 9 years ago

Me wantsa avatar you wanna patch?

If you can make me an avatar that i like you get a patch go!                          limit: 2 pics per comment as many comments as you want though (any more pics end up behind the related ibles thing)

Posted by Zaphod Beeblebrox 8 years ago

Americans avert energy crisis by dieting, study reveals...

Scientists at Cornell University, led by David Pimintel, have performed a meta-study and found that the easiest way for Americans to reduce, and even totally avoid, the looming energy crisis is to go on a diet.The average American consumes about 3747 kcal per day compared to the 2000 to 2500 kcal per day recommended by the US Food and Drug Administration. (This does not include junk food!)Producing those daily calories uses the equivalent to 2000 litres of oil per person each year. That accounts for about 19% of US total energy use.Pimentel estimated 6 kilograms of plant protein are needed to produce 1 kg of high quality animal protein. He calculates that if Americans maintained their 3747 kcals per day, but switched to a vegetarian diet, the fossil fuel energy required to generate that diet would be cut by one third.Pimentel calculates that the equivalent of 2100 kcal go into producing a can of diet soda which contains a maximum of 1 kcal. About 1600 kcal go into producing the aluminium can alone.Other suggested changes to the food production process range from replacing incandescent bulbs with energy-saving fluorescent ones, to using fewer machines, pesticides and fertilisers, and more human power on farms.Reducing the distance that food is transported could also cut energy costs: food travels 2400 km on average to its consumer in the US. This requires 1.4 times the energy actually contained in the food. Producing food locally would cut the energy expended transporting it by half.Implementing all the suggested changes would cut the US food industry's energy bill in half.New Scientist articleNew Scientist Environment Section, special report of energy and fuels

Posted by Kiteman 10 years ago

How many strands of 17 gauge wire twisted equal a 12 gauge wire (approx)

Hi,  I need a 12 gauge wire for the positive side of a small perimeter electric fence. However the only size aluminum wire they sell locally and I bought was 17 gauge wire. My thought is to twist the entire length of two or more strands of the 17 gauge wire together to equal the 12 gauge wire (approx)  How many strands of 17 gauge will it take to do so? One more related question while I'm at it. Does the twist have to be a tight twist or can it be a loose twist? Tight meaning a lot of twists per foot, loose meaning something like 4-6 twists per foot. tia - chase -

Posted by -chase- 3 years ago