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3D Model: 3D-Printable Hypoid Gear Drive Model

Hypoid gears are similar to bevel gears but the pinion and wheel in a hypoid pair have non-intersecting axes. Unlike our bevel gear model, where the gears are overhang-mounted, the pinion in this model is straddle-mounted (i.e sandwiched between two bearings) for a much sturdier assembly. Click here to see the video of this model in action, and download the .stl files.

Updated 2016-11-11

Tutorial: How to Design a Hypoid Gear Drive in Blender

A hypoid gear drive is similar to a bevel gear drive, but the axes of the pinion and wheel in a hypoid drive do not intersect. Hypoid gears are widely used in automotive and other industries. They offer high gear ratios, good efficiency and sturdiness of the assembly.

The math behind hypoid gears is daunting, but thanks to the online hypoid gear calculator we have developed, you don't need to worry about it at all. This concise tutorial shows you how to design your own hypoid gear pair in Blender easily.

Updated 2016-11-11

3D Model: 3D-Printable Hypocycloid Speed Reducer

The hypocycloid speed reducer is truly an amazing invention. We have designed a 3D-printable model of the hypocycloid drive in such a way that you can actually see the inner workings of this remarkable mechanism. Click here to see the video of this model in action, and download the .stl files.

Updated 2016-10-13

Tutorial: How to Design a Hypocycloid Drive in Blender

In a hypocycloid (or simply cycloid) speed reducer, a flower-shaped gear called cycloid disk moves around a stationary ring of round pins in a cycloidal motion, driven by an eccentric bearing or cam connected to the input shaft. Radial holes on the face of the cycloid disk in turn drive the pins of the output shaft. Hypocycloid drives are widely used in the industry due to their excellent characteristics, such as wide range of gear ratios, compact size, smooth transmission, high efficiency, high overload capacity, low noise, long service life, and compact design.

With the help of our tutorial, you can design your own hypocycloid drive in Blender in a matter of minutes.

Updated 2016-10-12

3D Model: 3D-Printable "Perpetual" Flip Calendar (.STL format)

Inspired by vintage flip calendars of the 60s, this 3D-printed "perpetual" desktop calendar needs no batteries. You flip it every day to advance the date and gravity does the rest. Click here to see the video of this calendar in action, and download the .stl files.

Updated 2016-09-22

Tutorial: How to Design a Planetary Gear Mechanism in Blender

The Planetary, or Epicyclic, gear mechanism consists of one or more planet gears revolving around a central, or sun gear. Typically, the planet gears are mounted on a carrier which itself rotates relative to the sun gear. A planetary system also incorporates an outer ring gear which meshes with the planet gears. The teeth of the ring gear point inwards. Gears like that are often referred to as internal. The planet and sun gears are regular, or external, gears, and the design process for those was covered in our Tutorial #1. However, the design of an internal/external gear pair requires its own set of formulas and its own calculator. This tutorial covers the modeling of a profile-shifted ring/planet gear pair, and sun gear.

Updated 2016-08-16

3D Model: 3D-Printable Planetary Gear Model (.STL format)

This stackable model allows for an unlimited number of stages. Even with 3 stages shown here, this planetary gear reducer packs an impressive 1:216 gear ratio. Designing planetary gears in Blender 3D is described in detail in our Tutorial #04.

Updated 2016-08-16

Tutorial: How to Design a Bevel Gear Drive in Blender

Bevel gears, also sometimes called conical gears, are gears where the axes of the two shafts intersect and the tooth-bearing faces of the gears themselves are conically shaped. Bevel gears are usually mounted on shafts intersecting at 90°, but can be designed to work at other angles as well. In fact, in this tutorial we are designing a bevel gear pair with the shaft angle of 100°. Also, the gear wheels designed in this tutorial feature curved teeth and an involute tooth profile. At the end of the tutorial, the gears' compatibility is successfully tested with Blender's Rigid Body Physics engine.

Updated 2016-07-06

3D Model: 3D-Printable Model of Bevel Gear Drive (.STL format)

Add this functional bevel gear drive model to your collection of 3D-printable mechanisms! The model features bevel gears with involute tooth profiles, curved teeth and a non-right angle between the shafts. Designing bevel gears in Blender 3D is described in detail in our Tutorial #03.

Updated 2016-07-06

Tutorial: How to Design Globoid Worm Drive in Blender

Worm drives are ubiquitous! They can be found literally everywhere, from heavy machinery to acoustic guitars. Designing a simple cylindrical worm drive is not hard: just apply the Screw modifier to a trapezoidal tooth profile and you get the worm, then throw in a standard involute gear wheel with slanted teeth and you are done. The globoid (also known as throated) worm drive is far more involved. Its backbone is not a cylinder but an hourglass-like shape cut out of a torus. The globoid worm shaft is as beautiful as it is picky: finding a mating gear for it is not a trivial task. In this tutorial, you will learn how to create both a worm shaft and mating gear wheel in Blender, and test their compatibility using Blender's Rigid Body Physics engine.

Updated 2016-06-10

3D Model: 3D-Printable Model of Globoid Worm Drive (.STL format)

Nothing validates a mechanical design better than a functioning, physical model! The globoid gear drive, the subject of Tutorial #02, is now available as a collection of 3D-printable parts in STL format that assemble into a perfectly operational and aesthetically appealing hand-cranked desktop mechanism. The model makes a great conversation piece, and a fun and educational toy for your kids!

Updated 2016-05-25

Tutorial: How to Model Geometrically Correct (Involute) Gears in Blender

Cogwheels are often depicted with straight and boxy teeth. However if you take a close look at a real-world gear wheel, you will notice that the sides of its teeth are not straight at all, and for a good reason. Two mating gears must stay in tight contact at all times, and most importantly, the direction of pressure one gear exerts on the other must remain constant to prevent vibration and noise. Leonhard Euler, a great mathematician of the 18th century, designed a gear profile satisfying these requirements with the help of the involute, a mathematical curve that can be described with a pair of simple parametric equations. In this tutorial, you will learn how to design a pair of perfectly meshing involute gear wheels in Blender in just a few minutes.

Updated 2016-03-20