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Crazy Cogs - Gear Play Set

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3D model description

I wanted to experiment with simple low-cost DC motors and see how easy it would be to make my own 3D designs to convert their high speed, low torque attributes into something more usable. So I designed this gear experiment set that lets you position and fix various gear sizes onto a matrix board. You can then drive the input with a commonly available DC motor or a crank handle option. I added a linear piston as an output device and also a spinning thing, but this is just a bit of a novelty.

https://www.youtube.com/watch?v=2tM8FO0YgnI

The gears have various diameters; 50, 45, 40, 35, 30, 25, 20 and 15 mm
All of them have a 10mm inner spindle gear.

The 8 x 8 cm matrix boards have M3 holes space at 5mm.

Use M3 x 20mm screws to hold the gears in place. I did try printing some 3mm pins for this but they are not so easy to print and were too weak. You can also print the stand-off feet the raise up the matrix boards to give space underneath for any excess screw length or if you want to secure them with a 3mm nut.

The motor is commonly available in eBay of from Chinese internal sites like Banggood. It is 20mm wide x 15mm in height and is 38mm in length measure from the spindle ends. The spindle is 2mm. Just search 3v DC motor and choose the flat more elliptical shaped ones, not the round ones

The DC motor controller and battery holder are also easily obtained from eBay sellers or banggood.com
Search:
Low Voltage DC 1.8V 3V 5V 6V 12V 2A Motor Speed Controller PWM

There is an option to fix the motor both horizontally with a bevel gears or vertically.

In use, it can be a bit temperamental and may jam up sometimes, but that’s part of the fun in getting it going. The m3 screws can sometime tighten themselves if it’s running fast gear can pop off so there could be secured with double M3 nuts. I’ve created recesses in the latest gear design to accommodate the screw heads. Screws of 25mm or longer may be used it necessary.

Tip: Only drive the out rings from other outer rings or the 10mm inner rings. It needs too much torque if you try to drive the 10mm inner ring from a larger outer ring.

The matrix boards seem to take forever to slice. I use Slic3r and it has to be left for hours!

List of STLs

GearBase80mm.stl - 8 x 8 cm matrix baseboard
BevelGear.stl - 30cm Bevel gear & drive pinion for motor
MotorHousing.stl - Holds the motor on the matrix board horizontally (use with bevel gear)
Motor90Bracket.stl - Allows the motor to mounted at 90° and used with a regular 10mm gear
PowerBox.stl - Holds the batteries and DC motor controller.
Handle.stl - All parts to make the hand crank
LinearPiston.stl - The long shaft, conrod, end cap and holder for the piston
LinearPistonPins.stl - Pins to connect the conrod and piston together.
Spinner.stl - three parts to make the spinny thing
StandOff.stl - the feet for the matrix boards

15mmGear.stl, 20mmGear.stl, 25mmGear.stl, 30mmGear.stl, 35mmGear.stl, 40mmGear.stl, 45mmGear.stl, 50mmGear.stl
The gears. Print as needed. the medium to large sizes are more useful. These are a later design. the images show some plain green gears but I updated them to look more interesting.

Everything is designed to print without supports. Standard infill of around 20% is normally fine, but you can increase if necessary.

  • 3D model format: STL

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License

CC BY


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