 going to show you how you can add joints and motion links here to be able to allow the turning of the spur gear to go ahead and move the rack back and forth. Right now as you can see I have a mass component so I can freely move these. You have to ground one of your components before you start adding joints because you have to tell Fusion which one is not moving and so we're going to ground the base here. So I'm going to go here to my components I'm going to grab the base right click and go ground. Now I go back to assemble as build joint. I'm going to choose my two components I'm going to choose my spur gear and I want that joint around this pin here of the base and I'm going to change my motion here to revolute. The third thing I need to do is to tell it the axis of rotation. I'll click there and now you can see that the spur gear starts spinning around that pin and I'll click okay that looks good.