I updated the Counter-Rotating Differential to try to reduce play.
- Added 4th gear and two more bearings
- Added m3-65mm adjustment screws to the top
I did, however, make a mistake in the design. I should have put the stops to the bearings on the outside, not the inside. I am finding that the bearings are popping out, so back to the drawing board. I think I will make some collars to keep the bearings in place for now. The final version will be corrected, though.
Overall it seems to be working well, keeping the body level and with less play than the other version.
Smart. The wheels would have stuck me up too. Would plastic glue melt too easily in its climate there? Also regarding Pi, isn’t Arduino the only platform recommended? I see a lot about it. Also ROS, is that Raspberry operatorating system? Standard With a zero, for example? Thanks
This is such a long complicated process, good for me to see such careful process through difficulties.
Hello Ally,
RE Compute: I don’t know what is “Recommended” for the compute module. I suspect I would get different answers from different boards. I am thinking of doing both. Using the Pi Zero (non-w) for the brains of the rover and communication back home. Then have different low power Arduinos to do functions like sleep/wake up and power monitoring. The Pi is indeed power hungry and it really doesn’t need to stay awake at night. My current plan is to have a Zero and a 3.3v Arduino on board the rover with another Pi 3 at home running PHP and MariaDB. I am also looking at a dropbox type file sync for the Pi to transfer the photos from the rover back home. Once there I will use the GPS and Axis information with the photos to do some photogrammetry. Trip 1 will have a few tasks. 1. Survive for a week or two, 2. Take photos and send them home, 3. Drive on a pre-designated route. Trip 2 unknown new goals so far.
Re Glue: I am using CA glue for the parts that need gluing it seems to hold up well in the heat, but time will tell. I have been using Zap-A-Gap Medium CA, so far it’s giving me a little time to get it right before it sets. I also have used Gorilla Super Glue, it tasks much longer to set which is good as well.
RE Process: Not much careful, just try and see what works. I am lucky enough to have a bunch of parts and a 3D printer.
RE: Wheels: I will have the STL files out soon for those. So far I am happy with Version 3.
Thumps up I’ll hope to visit updates soon and def. when he visits his ste first, even Trip 1 sounds fun. (.;