Aligning two faces

How do I align two entities namely a bearing and the pulley it is to fir into. The bearing is a group, the pulley is not. I have tried using the axis tool but doesn’t help.

Show us where you’re at now. Upload the SKP file or at least some images. If you make the bearing a component instead of a group, you can set the component’s axes to allow you to place the bearing easily and precisely.

As a general rule, the easiest way is to have Hidden geometry switched on then pick up the one object by a vertex that would be expected to make contact with the other one, then use the Move tool to move it to another vertex, plane or edge at the relevant point of contact