SERVO 12.2013 27
light enough for use in a 12 lb robot. The 8 mm shaft
may be somewhat awkward to deal with; with that small
of a shaft, it would be wise to either protect the wheel
from shock or add an outer support
bushing/bearing to distribute the load.
PDXNN Gearmotor/BaneBots
P60 Gearbox
Dimensions: 1.5 inches
square, 4. 16 inches
long
Nominal Voltage: 12V
RPM: 1,500 for 16:1;
900 for 26:1
Stall Torque: 91 in-lbs
for 16:1; 145 in-lbs for
26:1
Stall Current: 148A
Shaft: 1/2 inch diameter with keyway, 1.5 inch long
Weight: 15. 9-16.05 oz
Cost: $79.99-$84.99
Comments: Robot Marketplace sells an assembled
version of the BaneBots P60 gearbox called the PDXNN,
with NN being the ratio. Of the options, 16:1 and 26:1
are the most practical. BaneBots offers quite a few more
ratios through their website. These gearmotors are a
staple of the 12 lb class. They're not particularly
expensive, are easy to use, and are reasonably durable.
Three versions of the gearbox exist with each designed
for a different common size brushed DC motor. If you
take care to protect the shaft and wheels, these
gearmotors are a solid option for the 12 lb class; if four
or more are used, they’re at least an option for the 30 lb
class, though in that situation extra effort must be put
into shaft protection. The addition of a shaft
support is recommended.
Robot Power
Magnum 775
Dimensions:
1.75 inches square,
4.92 inches long
Nominal Voltage:
14.4V
RPM: 720
Stall Torque:
156.25 in-lbs
Stall Current: 140A
Shaft: 1/2 inch diameter with keyway, three inches long
Weight: 28 oz
Cost: $89.99
Comments: The Magnum 775 is the next step up from
the P60. This gearbox is designed to work with an RS775
motor which is the largest option for the P60 gearbox.
With a larger planetary gearbox and shaft supported by
a dual bearing arrangement, this gearbox is a solid
option for the 30 lb class. In a high shock environment,
a motor support plate like the one shown in the photo is
recommended; however, it may not be needed for all
applications. This is the largest currently available
gearmotor solution that could reasonably be
wedged into a 12 lb robot.
Equals Zero Designs DeWut?!
Dimensions:
2. 5 inches square,
6.1 inches long
Nominal
Voltage: 18V
RPM: 450, 1,450,
2,000 selectable
Stall Torque:
162.4 in-lbs
estimated,
middle gearing
Stall Current: 155A
Shaft: 1/2 inches diameter with keyway,
three inches long
Weight: 2. 9 lbs with three inch shaft
Cost: $190 (assembled)
Comments: The De Wut?! from Equals Zero Designs is an
attempt to create a replacement for the no longer
available Team Delta power drive kit. Due to the size and
weight, the De Wut?! is primarily an option for the 30 lb
class. The three selectable gear ratios ( 51.2:1, 17.1:1,
and 12.8:1) mean you have a solid range of speed
options for most practical wheel sizes. These gearmotors
are well designed, durable, and easy to use. Two
De Wut?!s will provide plenty of power for a 30 lb robot,
though if you want even more there have been
competitive 30 lb robots made using four
DeWut?!s.
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Product Spectrum:
Wheels for Bots 30 lbs and Under
When building a robot, there is a wide range of wheel options to choose from. All of the wheels
presented here are meant to be ready or nearly ready to
go solutions that are practical to use on robots weighing
30 lbs or less.