I'm not very familiar with mastercam, but here's some ways to make gears in solidworks:
If your version of solidworks includes the solidworks toolbox, you can do it directly in there. Make sure you have the toolbox enabled (Tools>Add-Ins). Then, click on the tab in the right column that looks like a bar graph. Navigate to Gears (Toolbox>Ansi Inch>Power Transmission>Gears) and select the type you want. Drag it into your model and a configuration table will appear in the left column where you can configure the pitch, # of teeth, etc)
If you do not have the toolbox, you could use Design Table Parts. Attached are two that I put together a while ago. (
Here's the hex one on 3dContent Central if you need a version for Solidworks 2007 or earlier) One has a hex broach and the other a keyway broach. You just open it up in solidworks and go to the "configurations" tab in the left column. Right click "Design Table" and open it. You can change the various properties (pitch diameter, # of teeth, bore size, etc) from there.
Keep in mind that for the purpose of general designing, it is often better just to extrude/revolve a disk of the pitch diameter in place of the gear. It is easier on your system resources and allows you to look at the model and make sure all your gears are tangent.