Finally we are up and running again, and I got some new parts in the mail yesterday!
Starting to look like a ball!
For the moment I have to glue the bows together, but that's OK.
Maybe in version two I'll manage to make them snapable.
I got a couple of new pieces today but I'm not completely satisfied!
I've misunderstood how the printing resolution works. I thought it would affect the surface roughness, but not the measurements.
This resulted in too thin material at the connection points
A quick update.
I had to change the tires of my wheels, the o-ring I meant to use had a diameter of 40 mm and I changed to one with a diameter of 45 mm instead.
New wheel diameter increased the top speed from 10 km/h to 11,5km/h 😎
I've been doing a lot of work since last time and there have been some changes in the design as well!
After I assembled a couple of parts in FreeCAD I realized that I had miscalculated (in my head) the size of some of them 🙁
I had to flip the base plate upside down to make room for the steering cradle and remove the friction wheels, because they wouldn't fit anymore. I also had to make the propel wheel larger to get better grip and to make the ball go a bit faster.
The approximate speed is now somewhere about 10 km/h, which is a quite good speed I think.
The base plate front view - with motors and steering craddle and its servo
Another post is up, about the propel system this time!
I have this idea that the ball will be driven with a motor and a small wheel inside a bigger ring, with a friction wheel underneath.
Sorry for my bad sketch
Finally I think we nailed the printing tolerance measurements! We also changed from white to black ABS filament, which seems to behave more accurately than the white one does.
I added some snap connections and push fittings to the new test piece so we can see if the printer has an accurate repeatability
Today I got my first "missing" parts to propel my ball 🙂 I'm going to make a simple and cheap speed controller by using two 30A brushed plane ESC, less than $9 each.
A couple of days ago I got a mail with an attached film clip of the first printed piece of the skeleton.
The day after, "Dubbear" came to my place and I got it in my own hands so that I could look, bend, squeeze and feel the first printed part of my very first CAD-project!
We took a look at my CAD-files and "Dubbear" showed me that my parts wasn't made as solids. I had simply misunderstood how to build the parts in a correct way!
Later on I did some googling and it turned out that it wouldn't be as much work as I feared to fix the parts into solids.
It's been quite some time since I last wrote something here, before the last post that is 🙂 so it's about time I do so!
It all started when I saw a post on Instructables about a Remote controlled basket ball robot. I immediately started to plan how I could make my own - who doesn't want a remote controlled ballbot!
Since I've got a lot of R/C parts laying around I figured it wouldn't be too expensive to gather the rest of the electronics needed, a DC motor and an ESC.
In the instructable the author used a 7" (17.8cm) hamster ball as the housing for his ballbot. 7" is quite small if you want to fit sensors and other fun stuff into the ball and really make it into a robot, not just a radio controlled ball. Continue reading
It's been a while since I wrote last time so I thought I'd better put something up!
This was my small contribution to GoKinema this year...
...a Cylon scanner to this über cool robo statue - Cambot 3000.
Anders at Gothenburg Prop Makers made the fantastic robot and I helped him to give it "life"!
The bot is made from old film lamps, lenses, tripods, and old camcorders, it stood in the entry hall at Gothenburg Film Studios during GoKinema. Continue reading
