Frame and Wheels
The parts used on the prototype are shown in
Figure 12. In the final design, the front and sides will be
separate components. The other components make up the
drive gears and wheels. Originally, the tires were made
from laser cut craft foam, shown in Figure 13. I think I
can come up with something a little easier to make.
The hardware that hold the gears, tires, and controller
in place is shown in Figure 14. This is mostly #6 and #4
hardware. The hardware will change as the design is
updated. Much of it is used to hold the wheels and idler
For the weapon, I plan on using the 20 amp brushless
speed controller and motor shown in Figure 15. These
should work well for a spinner weapon. For a flipper, a
servo may work better. Perhaps a combination of both.
One idea I want to try out is a high speed weed
whacker type spinner. I’m working on a brushless motor
controlled weed whacker that will attach to one of my hex
copters. This will be used to cut fruit down from a very tall
pear tree. I plan on a version of this weapon for the PBOD.
I will be starting a webpage that will list the complete
bill of materials for all the items in this series. Once the
design is complete, I will post the STL files for you folks that
want to print your frame and wheel parts. I will be posting
the prototype parts, as well.
You can find the PBOD web page at
Please be sure to post questions and suggestions in the
SERVO Magazine forums at
.com/ viewtopic.php?f= 49&t=17029.
Next month, we will start the new design and take a
look at some wheel alternatives. At the very least, I want to
have the basic frame parts available for assembly.
I will also look at machining some of the parts on my
CNC machines so that those of you without a 3D printer
can participate in this series. SV
46 SERVO 11.2013