Making BB-8 (v2) - Improving the Head - Part 7
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- čas přidán 13. 09. 2017
- In part 7 of how to make a BB-8 I work on the head being heavier than I'd like, so much that it affects performance. I change the way the head support structure attaches so that I can lighten it, and then I hack away at it to make it lighter. I swap the 2000mAh battery for a lighter 150mAh one. And I replace the deodorant ball casters with much better, but still fairly lightweight, Pololu casters.
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Jonathan Rieke
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The Pololu casters used are these ones:
www.pololu.com/product/2691
See also:
Making BB-8 (v2) - Adding HC-05 Bluetooth RC - Part 6
• Making BB-8 (v2) - Add...
Ball Bearing Motor - How to Make/How it Works
• Ball Bearing Motor - H...
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What?!?! Flour isn't a good glue? Well you learn something new every day...
Flour and water is a decent glue, but the problem I had was with sanding it smooth and making it blend with the sytrofoam at the edges.
RimstarOrg huh, interesting. first time I heard about that..
I like how quickly projects always go from "hmm I don't have any glue around maybe I'll just make my own with flour and water" to "alright I went out and bought a two part steel reinforced epoxy"
It's the 'minimalist way first' approach. But really, in this case with the problems I had sanding flour and water paste off the head back in Part 5 - Painting/Details/LEDs (czcams.com/video/PxG8bDkTSUI/video.html) I thought it had a chance of working. In fact it might have if I'd put the plastic pieces on the end. But I had that J-B Weld on the shelf waiting anyway. Everyone should have J-B Weld in stock :-). That stuff's stupidly strong. I first used it for gluing a tiny brass cylinder to the surface of a sheet of steel for my big Stirling engine (czcams.com/video/H1IkVMSBMRg/video.html), the cylinder that the displacer rod is going through. You can seriously pick up the Stirling engine using that cylinder with no danger of it coming off. Crazy.
Looking good. You certainly are putting some work into this project and it is great to see it progressing.
Wonderful... are we gonna reading your name in the special-effects-team of the next movie? 😍👍😂👏
Yes please!
your teacher must be proud.
Great work, as always!
Looking good! I can really tell the difference with the lighter head.
perhaps there can be teflon spray for the roller fittings.
Whaaaaat that was so cool
Maybe shorten the wires in the head to the minimum they can be, that may save you a couple grams.
Maybe an internal flywheel would help preventing the model from bobbing back and forth, doing a way better job than the gyro sensors...
Dunno, the wheel should have either some speed or some mass and this could really be a problem... 🤔
en.m.wikipedia.org/wiki/Anti-rolling_gyro
And
m.czcams.com/video/BTrgdhq0vTw/video.html
I _think_ that would work. It would stabilize the internal structure.
@@RimstarOrg
the model is already awesome as it is, to be fair! 😁
Hi, sry did you say ottawa? And what was the name of the club?
Yup, Ottawa, Ontario, Canada. The club is called Hack613. hack613.com/ There's a calendar of events there as well as a link to the discussion group.
Maybe the weight could be reduced further by powering it using induction from the body instead of including a battery pack?
The receiver inside the head would probably weigh more than the 150mAh battery. It's tiny and weighs only 4.65 grams.
What type of receiver are you talking about Steve? No need to put any advanced receiver. Just coil around some thin magnet wire and connect it to the led via a resistor. That should do it!
That's the type of receiver I'm talking about. I guess it would weight around the same as the battery. That battery's pretty ligthweight.
Like maestro
Why don't you use an Arduino with an accelerometer in the head? That would surely be heavy but much more effective and cool! And lolllzzz i think it's about an year you are doing this BB-8 Project. Great work by the way! Keep making videos.
The heavier it is, the harder it is to keep it on. That's because the heavier it is, the stronger the magnets have to be. The stronger the magnets are, the more powerful the motors in the drive system in the ball have to be, and also the heavier the drive system has to be in order to keep traction inside the ball. My driver system is at its limit.
Regarding the time for the project, I could have declared it done once I'd painted it, but this is the type of thing that you can always make improvements to and add new features. Some things wouldn't even be improvements, just different ways of doing things, such as replacing the Arduino and IMU in the drive system with some other boards. As long as there's an improvement, new feature or something to be learned and passed on then it's all good.
Don't use magnets. Use arduino in the head along with three motors and three wheels. The head will automatically balance itself.
watch this
czcams.com/video/dlwcXgZYImU/video.html
I haven't watched the video but i think this is what I am trying to say
Yup, I've seen James' series on that. That would be similar to mine since it stays on top like mine does. That one doesn't have a drive system inside the ball so so it doesn't work as well as one that does. However, you could have a head driven that way that is somehow synchronized with a drive system in the ball.
The problem with that type of head, and it's the reason James moved on to future versions that use magnets, is that BB-8's head is supposed to be able to tilt down the side part way, so not always staying on top. Mine doesn't do that, and I don't know if it ever will, so I guess it's a non-issue with mine. Here's a photo from the movie of the head tilted lumiere-a.akamaihd.net/v1/images/bb-8_14e2ad77.jpeg?region=0%2C0%2C1560%2C878&width=768
Why not getting rid of the ball-bearings at all?
CZcams: *Amazing Discovery With Magnets*
I suspect if you try that vertically, it wouldn't be stable. That's why the levitating one is usually spinning or there's some active electronics with a coil for the bottom one to keep it stable, which would add weight to the structure near the top of the ball. It would be an interesting approach to explore though.
Are you a electrical engineer
Nope. I've just been playing with electronics and making stuff my whole life. I learn as I go along.
😀😁😂😃awdsome😃😂😁☺
If he wanted to run fast can lose your head
Actually, I know you're joking but I was thinking of experimenting with speeding it up (tweeking the PWM duty cycles) and maybe the momentum will make the drive system have to work less hard and be able to keep the head on better. On the other hand, the head may just fall off easier when it hits a piece of tape or a slightly mismatched section of the seam. I might just try it.