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Picture of Simple Bots: Buck
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Just like a bull, a bronco, and a ninja, Buck has a lot of kick. With spring-loaded feet, this noisy little bot does a lot of stomping about. Everywhere Buck goes, commotion ensues. This keeps people on their toes, which is a good attribute for any bot to have.


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Step 1: Go get stuff

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You will need:

(x1) continuous rotation servo modified for direct drive**
(x1) 4" x 3" x 2" plastic container
(x1) 4 X AA battery holder
(x1) 5" cylindrical metal drawer pull (with two arms)
(x1) 8-32 x 2" bolt
(x3) 8-32 nut
(x2) 4-40 x 3/4" bolt
(x4) 4-40 nuts
(x2) 1/8" (inner diameter) x 1/2" plastic spacer
(x1) 3/4" to 1" extension spring
(x2) 4-40 x 1/4" nuts and bolts
(x1) Assorted zip ties

**Modify your servos for direct drive here

Step 2: Drill

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Drill two 1/8" holes opposite each other on the servo horn.

Step 3: Fasten

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Pass the 4-40 x 3/4" bolts up through the holes in the servo horn.

Thread a nut all the way down to fasten them in place.

Slide on the plastic spacer, and then screw on another nut to fasten this in place, as well.

Step 4: Mark

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Lay the drawer pull on its side and make a mark on the top surface 3" from one side of the handle.

Step 5:

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Drill a 3/16" hole through the handle in the spot that was marked.

Step 6: Spring

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Slide the spring down to the end of the 2" bolt. Fasten this firmly in place with a nut.

Thread another nut half way down the bolt.

Now, slide the bolt into the hole that was drilled in the drawer pull.

Fasten the bolt in place by threading on yet one more nut.

Step 7: Mark and Drill

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Turn the plastic container upside down. Measure 1/4" up from the container's lip and 2" in from the side of the container. Make a mark.

Make an identical mark mirrored on the opposite side of the plastic container.

Drill both of these marks with a 1/2" spade bit.

Step 8: Insert

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Insert the metal drawer pull through the 1/2" holes that were just drilled. The drawer pulls mounting arms should be orientated so that they stick upward out of the containers opening.

The arms of the drawer pull should also be sticking out beyond the opening of the plastic container.

Note: The drawer pull that was used here had a removable arm which twisted off. Being able to take this off, slide it into place and reattach it, made this task easier.

Step 9: Drill Some More

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Position the free end of the tension spring such that it is touching up against the bottom of the plastic container.

Flip the container over and make a mark on each side of the spring's mounting ring.

Drill through both of these marks with an 1/8" drill bit.

Step 10: Fasten

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Using the holes that you have just drilled, zip tie the spring to the bottom of the plastic container.

Step 11: Motor Mount

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Place the servo on the inside of the plastic container, next to the drawer pull, in a manner such that the whole motor is on the inside of the container and the bottom of the servo is flush with one of the side walls.

Make marks that line up with the servo's mounting holes and drill them with a 1/8" drill bit.

Step 12: Mount the Motor

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Using the mounting holes that were just drilled, zip tie the motor in place such that the servo horn is closer to the drawer pull.

The rods jutting out of the servo horn should now be coming into contact with the bolt inserted through to the drawer pull.

Step 13: Drill a hole

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Drill a 1/8" hole in a spot on the plastic container where you can pass through the servo's power wires without interfering with the operation of the motor.

Step 14: Battery Mount

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With the plastic container still turned upside down, place the battery holder centered atop the container.

Make a mark in each of the holder's mounting holes and then use these as guides to drill two 1/8" holes.

Step 15: Mount the Battery Holder

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Fasten the battery holder to the outside of the plastic container using 4-40 x 1/4" nuts and bolts.

Step 16: Wire it up

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Solder together the red wire from the battery holder with the red wire from the servo and the black wire from the battery holder with the black wire from the servo.

Step 17: Clean up

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Zip tie the wires together to make them neater and to separate the solder connections so that they cannot come into contact with each other.

Step 18: Power

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Insert batteries and watch it go.
JuJer2 years ago
Or has that already been claimed
JuJer2 years ago
I love your bots your truly the father of simple bots
You should try some Sugru or rubber at the bottom for slightly more grip...
Where can I get those white plastic spacers? Thanks.
randofo (author)  TedRobotBuilder2 years ago
I got it at Ace Hardware.
I've always been a fan of your pics. But I see a slight fault for the first time. Your 'Go get stuff' image is a bit blurry (easier to pick faults than to do better I guess :-). But still AMAZING photography...

This bot reminds me of bull riding. A cool mod will be to make a bull shaped body with a cowboy on it :D
Lindie2 years ago
Cool!
you need to make one out of lead and turn it on when you leave for work in the morning.
randofo (author)  amandaghassaei2 years ago
The filming for this video resulted in some stopping from upstairs.
meanpc2 years ago
Your project photography is incredible
M.C. Langer2 years ago
I love it! One day, I have to build one of your amazing simple bots!