Robotics

Robotics.Robot2 .*;

Parts List

  • 1 - 12" x 72" x 0.032" sheet aluminum 6061-T6
  • 1 - 12" x 48" x 0.065" sheet aluminum 6061-T6
  • 1 - 2" length of 0.5" x 0.125" x 0.25" drawn aluminum tube 6061-T6
  • 1 - 24" length of 0.5" x 0.065" x 0.37" drawn aluminum tube 6061-T6
  • 8 - Steel compression springs with 6-7 lbs max capacity. 1/2" x 1-1/2" x 0.041
  • 1 - 12" x 12" x 5/16" sheet HDPE

6061-T6 is great, though a little expensive. It's incredibly strong and very light weight. So strong it's almost impossible to fold by hand.

HDPE, or high-density polyethylene, is a great plastic to work with. You can almost do anything with it. My only complaint about HDPE is how heavy it is. Thankfully, this design didn't really use much of it.

  • 2 - Light-weight 3-inch wheels. I used Sullivan SkyLite 3-inch R/C aircraft wheels; rubber covered foam core. These are the hardest wheels I found at the local hobby store; the logic being that the softer the wheel, the more resistance encountered where it meets the ground (harder = less resistance, less resistance = more torque).
  • 2 - In-line skate wheels with bearings
  • 2 - 96-tooth, 48-pitch Delrin hub gears. 2" diameter.
  • 2 - 40-tooth, 48-pitch Delrin gears. 7/8" diameter.
  • 2 - 1/4"-bore aluminum gear hubs to fit 96-tooth gears.
  • 2 - 6mm-bore aluminum gear hubs to fit 40-tooth gears.
  • 4 - 22mm bearings (ABEC 5 - 608ZZ) (in-line skate wheel bearings).
  • 4 -12mm bearings (NMB R-3HH).

2 - motors with 30:1 gearboxes, 12-volt, 200rpm (Hsiang Neng #HN-GH12-2416T). They've got a lot of torque. And their weight isn't too bad considering their strength.


1 - Magnevation Dual PWM Driver, 12 to 55 volts DC 0- 3 amps per channel.


1 - HS-805BB Mega 1/4 Scale servo (R/C type servo). This thing is expensive, but powerful. So powerful, its 1/4-inch thick servo horn is hardly strong enough to survive use.


2 - OOPic-R microcontrollers.


1 - Devantech SRF04 Range Detector - ultrasonic ranger with range of 3" to 10'.


4 - Sharp GP2D-12 Infrared Range Detectors - with a range of about 2 - 12 inches.


 

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