181–190 of 230 posts
Wow this is great OP! If you like this check out http://507movements.com/ - an animated webpage of 507 mechanical movements with descriptions from a classic book.
If someone ever makes the creation process for this type of visualization accessible to the average university professor, it could blow the lid of the digital textbook market. Most digital textbooks I've seen are basically just putting the text and images on a web page, and maybe integrating multiple choice quizzes. That's seriously under-utilizing the medium. They need to be interactive , and encourage the student t…
I've always been partial to this TAM 212 online reference from UIUC. I don't know what the professor used to generate it but many of the diagrams are interactive and help build intuitive understanding of the material. http://dynref.engr.illinois.edu/ref.html
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I’ve seen fiberglass reinforced nylon gears used with success in commercial injection molded gearboxes. It can definitely help by increasing gear stiffness. However 3D printing with fiberglass causes rapid nozzle wear, and recently people are saying that fiberglass reinforced 3D printing filaments represent a human hazard. Since I’ve managed to get my gears to work without reinforcement, I’ve not tried it. One thing…
Have printed many spools of CF and glass filled nylons using nozzles with tips made from ruby. Check out “Hardcore Ruby” nozzles, now there are even diamond nozzles. I print with 0.25mm nozzle in nylon, fine enough for Module=1.5 teeth. A 0.15mm nozzle would make an acceptable Module=1 gear I would guess.
I actually print with a 1.2mm nozzle as I want to print big parts. I’ve even got the e3d Supervolcano hot end. :)
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Thank you! It’s certainly an involved project. I recommend starting by building one motor and gearbox assembly and getting control working from python. If you can get that far you can build the rest! And the website you linked looks nice. There is also hackster.io and hackaday.io. While those sites are fine, it becomes one more thing to update. I prefer imgur for simple photo albums as that integrates well with reddi…
That makes sense, thanks! Regarding the build, I didn't see any information regarding the control system on the material I saw, but I probably wouldn't want to make it as autonomous as you have. I'd probably connect an ESP8266 as the controller and a receiver for my RC radio and control it that way. Out of curiosity, is there more detailed information about the controller somewhere?
I’ve got some info on the motor controllers I’m using: https://reboot.love/t/vesc-mods-for-robotics-use/
The control computer is a raspberry pi running python. It looks like I’ve not committed the code in a while, but this repo may be helpful: https://github.com/tlalexander/rover_control
Though for the above, I’ve recently found that I can use velocity control on the VESC, which is easier than doing velocity control on the Pi as I had done in that repo.
For the wireless remote control I use, it’s my own design and they’re not for sale or well documented. I’d recommend any wireless controller that you can read in python.
The software should be pretty simple now that I’ve switched to velocity control mode. You just need to read a joystick and convert that to velocity commands for each VESC. Technically even the VESCs could do that onboard if you wanted to modify the firmware.
But if you can drive the VESC from an esp32 that would work too.
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I'm a professor currently writing an online textbook. I can assure you that writing a textbook, without anything interactive, is extremely challenging. I find it hard to imagine a time when my book will be good enough that adding interactive explorables will be the best educational return on time invested. (Though I'm thinking about it!)
I think it definitely is more appropriate in some domains than others. Sometimes you can replace 1000 words with a picture, 100 pictures with a video, and 10 videos with an interactive visualization. In that case, it might not actually be more work. I think the problem is that it's very different work, that professors aren't trained for. Again, it's not easy, maybe impossible. But if it could be done... PS - I see yo…
This is an absolutely phenomenal 'explorable explanation'. It methodically layers concepts to foster understanding, deploys interactivity to build intuition, and on top of all that provides crisp, clear narrative on top of all of the amazing visualizations.
> /* Dear explorer, this code works, but is by no means of high quality. Once a post is written I don't go back to the source code again and the formatting, robustness, DRYness and abstraction choices reflect that. */
This is an absolutely phenomenal 'explorable explanation'. It methodically layers concepts to foster understanding, deploys interactivity to build intuition, and on top of all that provides crisp, clear narrative on top of all of the amazing visualizations.
This is an absolutely phenomenal 'explorable explanation'. It methodically layers concepts to foster understanding, deploys interactivity to build intuition, and on top of all that provides crisp, clear narrative on top of all of the amazing visualizations.