![solidworks toolbox gear solidworks toolbox gear](https://i.ytimg.com/vi/4fIquiEurKo/maxresdefault.jpg)
Lastly, mate the Sun Shaft into place with another set of concentric and coincident mates (this part is not actually necessary to show the motion we are after). Get the Carrier in place by adding Concentric mates to each Carrier Shaft, and one Coincident mate to bring it flush with the back of one of the shafts. Now, mate the Carrier shafts to the centers of each Planet Gear (Concentric) and flush with their front faces (Coincident). Next, mate the center of the pitch circles of the Planet Gears coincident to the Planet Gear Path sketch. Next, mate the center of the pitch circles on the Ring Gear and Sun Gear to the Assembly origin, they should both be able to spin. To speed up this process, use the Multiple Mate Mode button, and select the Front plane as the common reference. To start assembling the gear system, we will mate the back face of each gear Coincident to the Front Plane of the assembly (make sure that none of the parts are fixed in-place, if so right-click the part and select Float).
![solidworks toolbox gear solidworks toolbox gear](https://i.ytimg.com/vi/P9s7jW3fMvY/maxresdefault.jpg)
The Ring gear has an additional construction circle drawn to guide the path of the Planet gears, this will be key to correct motion and will be called the Planet Gear Path. In each of the gear part files, pitch circles have been created as construction circle sketches. To set up our planetary gear system,first we will insert all of the necessary components into a new assembly document:
![solidworks toolbox gear solidworks toolbox gear](https://blogs.solidworks.com/tech/wp-content/uploads/sites/4/Creating-Gears-in-SOLIDWORKS.png)
We are going to go over the setup of a planetary gear assembly in SOLIDWORKS that will allow us to demonstrate the motion of the three drive types of this system. Planetary gearing is a compact alternative to standard pinion-and-gear reducers and is used in a wide variety of applications to provide high torque.