Basic Mechanisms

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Cable System

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Cable System

Build a cable system mechanism with the Hummingbird Robotics Kit! The cable system transfers the servo’s circular movement to a bending movement.

Popular uses of the cable system include bending necks and wiggling fingers. What will you create?

Build Time: 45-75 min (depending on skill level and design choice)

Hummingbird Robotics Kit Hardware

  • Hummingbird Controller (Bit Controller pictured. The Duo controller will also work)
  • Battery Pack or AC Plug Position
  • Servo (Your servo may look different)
  • X Servo Horn

*All of these parts are included in any Hummingbird Robotics Kit

Suggested Craft Supplies

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Double knot the end of the string to the servo horn.

From the scrap cardboard, cut a strip of cardboard. This one is roughly 16cm by 4cm. Your cardboard strip can be a little larger or a little smaller to accommodate your design. 

Fold the strip of cardboard into 4 equal sections.

Cut 3 small pieces from the straw. Each piece should be about 3 cm long.

Hot glue the the 3 pieces of the straw to 3 sections of the cardboard strip.

Punch a hole in the bottom section of the cardboard strip. The hole should be close to the crease.

Make 2 small cuts (about 1 cm in length) along the top left and top right of the cardboard strip

Feed the string though the hole in the bottom section of the cardboard, then through each of the straws.

Interlock the tabs on both sides of the box.

Place the position servo near the edge of the box. Trace around the servo, then cut out the rectangle. Be sure to cut on the inside of the line so that the servo has a snug fit.

Feed the wire into the box, then push the base of the servo through the hole until it is secure. If the hole was cut too large, a dab of hot glue may help to keep the servo in place.

Glue the bottom section of the cardboard to the top of the box. The hole in the base of the cardboard strip should be in line with the servo shaft.

Push the servo horn onto the servo shaft. Pull the string until taut, and then wrap the sting around the top of the cardboard strip so that the string fits into the cuts on the left and right sides of the cardboard. Lock the string into place by fitting it through the cut on the the top section of the cardboard.

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