• GWorks
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Cyber K'NEX Bobcat / Skid Steer


Cyber K'NEX Bobcat / Skid Steer

This instructable will show you how to make a remote-controlled Bobcat or by some called a Skid Steer Loader from K'NEX!
I've made this model for the K'NEX to demonstrate how compact you can build with the Cyber K'NEX system. This is a system that uses an "intelligent" processor unit, to which motors are attached. It may be hard to get the parts if you don't have the Cyber K'NEX Ultra set from 2002. You can somtimes find the complete set for 100-200$ on Ebay.
This model also relies on the use of a custom 3D-printed worm gear, which makes it possible that the bucket of the model can be raised and lowered. Normally this requires big amounts of torque, which the K'NEX motors cannot deliver. The worm gear, slows down the rotational movement, while increasing the torque on the axle of the following red gear. This is then again slowed down by a gear reduction of 1 : 2,4 to reach the axle of the bucket.
There is no video of the model working, it had run out of batteries.
The steps are as followed:
  • Parts needed
  • Chassis
  • Rear end - Lower part
  • Rear end - Upper part
  • Shovel & Finishing up
  • Controlling the model
If you have questions or suggestion regarding the model, please place them in the comment section and I'll try to answer them as quick as possible.
Happy building!

Step 1: Parts Needed

You will need the following:
Access to a 3D printer, or willing to use a 3D print service like Shapeways or 3D Hub.
I got the design of the Worm gear from GrabCAD
Cyber K'NEX parts:
  • Processor
  • Programmable cyber key
  • Single Batterypack + Motor 1
  • Double Batterypack + Motor 2 & 3
  • IR remote
Rods: Buy here
  • 155x Black rod (I counted 151)
  • 87x Silver rod + 2x Black rod
  • 8x Blue rod
  • 15x Dark grey rod
  • 2x Green rod
  • 1x Tan rod (strengthend, is necessary)
Connectors: Buy here
  • 9x 8-way black connector
  • 24x 7-way blue 3D connector
  • 48x 4-way silver 3D connector
  • 36x 5-way grey connector
  • 29x 4-way green connector
  • 20x 3-way dark grey/red connector (+ 2 broken ones, if you have them)
  • 4x 2-way (V-shape) grey connector
  • 2x 2-way (Long shape) brown connector
Clips/Other: Buy here and here
  • 2x Complete hinge (consists of 2x hinge blue part & 2x green/black part)
  • 19x Metallic spacer (1½ width)
  • 13x Blue spacer (½ width)
  • 2x Black clip with rod end
  • 2x Silver clip with rod end (can be interchanged with black)
  • 4x Ball and socket Large
  • 2x Clip with hole end dark gray
  • 4x Clip blue
  • 1x big rubber band (not on picture, see last step)
  • 15x Interlocking clip Dark brown + Tan
Panels: Buy here
  • 2x Tri panel mini silver
  • 3x Tri panel mini black
  • 2x Square panel mini black
  • 1x Tri panel small silver
  • 1x Tri panel small black
Wheels: Buy here
  • 4x Tyre Large
  • 4x Hub/Pulley Medium
Gears: Buy here
  • 4x Gear small Push-on Grey
  • 2x Gear small Dark blue
  • 5x Gear medium red (Maybe all 9, silver is for the looks)
  • 4x Crown gear medium grey

Step 2: Chassis

This step will show you how to make the Chassis, via the pictures.
First you start with the inner section, that will be between the motors. After adding the motors, you add the sides that will hold them together. After adding a piece on the back and some small wheel covers, you add the gear mechanism for the wheels, and the wheels themselves.

Step 3: Rear end - Lower part

This step will show you how to make the Rear end.
First you start with placing the battery pack loosly in it's place. Then the rear gets it's cover and the strenght of the model increases.

Step 4: Rear End - Upper part

This step will show you how to make the upper part of the rear end.
The processor unit is put in it's place. You don't have mind the place of the cables too much, yet. Then the ON/OFF switch is added at the rear. This is used to turn the complete model ON. Then the battery pack for motor 1 is put in it's place, after which the motor and the worm gear are installed. Then the gears are put in place and you will make the Bobcat's roof & roll-cage.

Step 5: Shovel & Finishing up

In this step you will make the shovel/bucket and attach it to the model.
Note that I used 2 broken 3-way connectors in this. You can also use a clip with a hole (1-way connector)
And that's it! You've fnished the model. In the last step, you will see how to control it.

Step 6: Controlling the model

For a more detailed explenation about the Cyber-K'NEX system here's a more complete guide.

I hope you've enjoyed this instructable, if you have comments, suggestions or questions, put them in the comment section found below. Thanks for checking it out :)