I almost always design my gears with module instead of diaetral pitch, even though I design everything else in inches. So, the LEGO 24 tooth gear has a pitch diameter of 24mm. It is the number of millimeters of pitch diameter divided by the number of teeth. Module: This does the same thing as diametral pitch, which is to describe the size of the teeth, but with metric units and as a ratio. Both mating gears must have the same pitch. Common pitch sizes in radio controlled cars are 32, 48, and 64. The bigger this number is the smaller the teeth are. The units are generally teeth per inch of pitch diameter. The other one is just called the gear.ĭiametral Pitch: This describes the size of the teeth. Pinion: This is the name of the smaller of two mating gears. It isn't important in any of our calculations, but it is important if our gears are going to fit into a housing.
Outside Diameter: This is the diameter of the circle that makes up the tops of the teeth. If you have two shafts, and you want to connect them with gears, the center distance is how far apart those shafts will be. In Inventor though, it won't be that important to know.Ĭenter Distance: Half of the pitch diameter of the first gear plus half of the pitch diameter of the second gear would give you the distance from the center of one gear to the other. When designing gears from scratch, without the help of a $1,890 (per year!) piece of software, the pitch diameter is our most important dimension. In other words, if your gears were perfect cylinders with perfect friction on each other, the diameter of these cylinders would be the pitch diameter. Pitch Diameter: This is the diameter of your gears if the gear teeth were infinitely small. There is a ton of gear vocabulary, but I'm only going to discuss the minimum that we need to know to make the gears. Also, Inventor is free for students and teachers, so hopefully you fall into one of those categories, or at least can convince Autodesk that you do.įirst, lets get the vocabulary out of the way. I've done some cursory research, and no other software makes generating custom involute gears as easy as Inventor, free or expensive. I can hear what you're thinking right now: "What?!? Inventor?!? Do you think I'm made of money?!? Why don't you show me how to make gears in Fusion 360?" Let me tell you I would LOVE to show you how to make involute gears in Fusion, but I don't know how.
I'm going to tell you what I know about gears, and how to design them for use in your 3D printed project using Autodesk Inventor. Being able to design gears for 3D printing is a super useful skill, but if you don't know anything about gears it could be a little more complicated than you might expect. Awesome! It's probably going to be something great. You want to design your own thing that you're going to 3D print, and it's going to have gears.
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