Octopod Mechanics Complete

I’ve finally finished printing all of the mechanics for the Octopod!  Below is a pic of it all assembled.

2014-09-11 22.26.23


So the next step is to assemble the PCA9685 breakouts from Adafruit and test out some walking!  In the mean time I wanted to list a few improvements that I would make to the Mark II chassis.

  • Longer Body – If you look at the legs you can see that there isn’t much space in between them.  This means they don’t have a very large range and therefore won’t be able to take large steps.  I designed the chassis have 15 degrees between each leg, thinking that would be enough for a good range of motion, however I didn’t account for the bulky servos getting in the way.  One way to fix this problem would be to make the chassis longer, allowing for the hip servos to be spaced apart more.  I’ll have to investigate how much space I can add and still fit the body in my printer’s 6x6x6 inch build volume.
  • Add servo horn holes – The servo horns fit fairly snug in their printed holes, but tend to fall out if too much strain is applied.  I applied hot glue to better keep the servo horns in place, but a better solution might be to add holes to the 3D printed parts and bolt them into place.
  • Longer Legs – As previously stated, step size is going to be a key factor in the speed of the robot.  Another way to improve the step size would be to make the legs longer.  I also think longer legs would improve the spider aesthetic.  I’m currently unsure of the load bearing abilities of the 9g servos, so I’d like to experiment with this chassis so I can determine how much longer the legs can get without sacrificing too much torque.
  • Mounting Holes – Depending on what board(s) I end up using in the final product, I’d like to add mounting holes to firmly attach them directly to the body.

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