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Apr 8, 2008
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Comment: Probably worth it. I was definitely in "slummin' high school" mode then, when we didn't…
Comment: Hell yeah. Primarily small weight classes and these days grassroots-level and builder r…
Comment: Purely as a matter of convenience. The t-nutted holes are not nearly as strong as a pro…
Comment: The design you describe is a classic "overconstrained slide". It's very sensitive to ch…
Comment: Sup everyone, Feel free to chat amongst thyselves and ask questions. Interesting discu…
Comment: I knew I was forgetting something! Gizmology has been added to the end - I may sprinkle…
Comment: Incidentally, I got a new USB keyboard soon after writing this because my laptop's keyb…
Comment: It is extremely difficult to install *internal* sensors onto a mystery motor (of which …
Comment: Absolutely - this has been done by a few people, most notably:http://wattsdottime.blogs…
Comment: Please spend some time and read through at least some of the pages. The information you…
Comment: Yup, I definitely accidentally cloned two file versions. Just fixed it - there should b…
Comment: Free stuff, lab work, and/or graduate student stipend. What's the "fund from school" yo…
Comment: I did in high school (I founded FRC 1771 in 2005/6) and 80/20 is indeed a very popular …
Comment: I feel like that's an Instructables derp. The text editor is extremely buggy...
Comment: Keep reading :) Demonstration videos are in Steps 43 and 44.
Comment: Please refer to Step 3 for the DXF drawings (submittable as-is to Big Blue Saw) and the…
Comment: Not the KBS - Kelly does have the KSL line which is sensorless, but I have not heard ve…
Comment: You wouldn't necessarily need one, but as long as you are getting a Li batt from Hobbyk…
Comment: Because I want to build your own Segway, I want to do this very project. But I only hav…
Comment: Hey Larry,I wouldn't expect a 3DP sprocket to last very long due to it interfacing with…
Comment: Wow, if this is the mindset of Americans today, we're totally boned. "I'm not going to …
Comment: But that in itself is what concerns me about the modern West. And I specifically call o…
Comment: "He said".No engineer in his right mind would characterize this creation as anything yo…
Comment: Much of our problems comes from the "speculative" nature of willfully ignorant people l…
Comment: Considering that your entire call is composed of lies and fabrications, yes, it's very …
Comment: "goes around glowing in the dark until they prematurely die from radiation"Let's not ke…
Comment: Where does it stop with people like you?
Comment: Hi, This will probably work out better for you:http://kellycontroller.com/hpm14701700a1…
Comment: 3) Sure, because the chamber needs to be a hard vacuum. Such a heavy steel vessel gives…
Comment: That sort of fearmongering is what's casusing amateur engineering and tinkering to beco…
Comment: Ahh, but see, this is an Instructable. That's your job!
Comment: At the first order level, none. However, the very basic analysis I detail ignores all n…
Comment: Direct drive robotic joints do exist. They are more commonly discrete motors that are v…
Comment: Indeed it is. Autodesk Inventor is a 3d parametric modeling software, along the lines o…
Comment: This stuff more or less only makes sense in metric...
Comment: Oh. If you meant "did I generate those pictures" then yes, using Autodesk Inventor's na…
Comment: ?
Comment: That's how this whole custom brushless motor thing got started more than a decade ago. …
Comment: Interestingly enough, an ironless axial flux type motor is in my sights in terms of fut…
Comment: Not on paper. Yet anyway.
Comment: Indeed it is.
Comment: Correct. The reasoning behind my "lower efficiency" advisory is that it is more difficu…
Comment: You can calculate and design the motor(/generator) according to your needs. I do not be…
Comment: Both PMDC and BLDC/PMAC motors will generate electricity when given mechanical input.
Comment: That would ruin the challenge of the exercise.
Comment: http://www.youtube.com/watch?v=h5e-ad1cz90' How well it works will depend on how you d…
Comment: Correct. Permanent magnet motors (not induction: that's much trickier) may directly act…
Comment: Outside dimensions being the same, an axial motor will tend to have poorer torque chara…
Comment: Oh, I'm definitely not saying they *couldn't* be used, just that most direct drive moto…
Comment: Relatively few robots use direct drive motors. Robots tend to be fast, zippy and nimple…
Comment: That is known as an axial flux motor, and it follows much of the same laws (and equatio…
Comment: The BWD scooter is a derivative of this build by a summer engineering program at MIT. I…
Comment: Wow, I have been using this style of assembly to build practically everything now - Las…
Comment: Site's back up! Now with an all new build report documenting the rebuild of the Razor s…
Comment: I bum server space from a friend, who incidentally recently moved servers, and I've bee…
Comment: Wow, that's some pretty sophisticated stuff. I bet the current limiting also helps prev…
Comment: Have you tried United Hobbies/HobbyCity? They have great deals on obnoxiously large mot…
Comment: You could indeed. In fact, low-voltage is usually the cheapest to run. Obviously your p…
Comment: The less expensive outrunners like the Turnigy series do suffer from bell resonance at …
Comment: Absolutely. Set screws need to be used with a spot drill in the shaft or a flat. Otherw…
Comment: When I get the wheelmotor'd version running, definitely a possibility...
Comment: But perhaps a less twitchy accel is better anyway. I cracked open a BionX e-bike kit a…
Comment: A good LiFe cell will easily discharge at 20C and can burst-discharge 40C for short per…
Comment: You're basically correct on the motor, but a few additional details. The motor current …
Comment: Yup, I've been messing around with making my own motors. Not having a professional leve…
Comment: I don't think I've actually touched full throttle with this thing because it's just tha…
Comment: The motor itself will see whatever the controller passes to it. The voltage drop you're…
Comment: The best choice currently is not the usual "lithium ion", which is lithium cobalt or li…
Comment: The average cruising current was closer to 10-15 amps. I've metered momentary current d…
Comment: Then do it.
Comment: We can also talk about electric vehicles.
Comment: As a general rule, you want your electric motor to run as close to its no-load speed as…
Comment: I'd probably save the trouble and just use the Arduino board. Your system will be more …
Comment: Belt drive strength increases with the tooth pitch, width, and system tension. That ess…
Comment: You definitely can. The hard part about adapting bicycle parts is that they tend to be …
Comment: I could go to a restaurant and have a nice juicy steak that someone else prepared, or g…
Comment: Sadly enough I hear that MIT is well known for the latter type of person -____- The t…
Comment: That's kind of hard to answer. Electric motors have an interesting characteristic in th…
Comment: No, I just build too much stuff for my own good. Building cool stuff for a living is qu…
Comment: Nope. Losses from current draw increase with the square of the current (P = I²R), and c…
Comment: For this thing, about 5 or 6 miles. It could improve, but hey, it wasn't optimized in a…
Comment: You're right. It's not green, because green is a color, not a contrived, meaningless te…
Comment: Larger wheels will increase top speed but have a corresponding increase in current draw…
Comment: Nobody sells one that does what I want.
Comment: I have to finish it first. I've been a bit on the busy side this summer, and only got a…
Comment: Depends, what kind of vehicle are you running?
Comment: There's some pretty serious machining and custom parts involved in the Razor scooter co…
Comment: You could... Rebuild the mounting provisions to allow for a bike wheel with a sprock…
Comment: Two factors. Number one, the motor is ungodly huge and capable of generating very high …
Comment: Well, if you're the 10-year-old in question... save up an allowance for longer? Mow law…
Comment: I suspect an audio-taper potentiometer will exacerbate the problem. Really what is need…
Comment: Indeed it was! However, that was a peak reading, and definitely not sustained! Cruise a…