There are a number of places on the Internet where you can download components for mechanical engineering. Instead of making the parts yourself from blueprints notes and so on, you save a lot of time and get the correct dimensions (and sometimes even colors and names) etc.
TraceParts (Register, free of charge):http://www.traceparts.com/users/tpo.asp
SolidComponents (ne need to register):http://www.solidcomponents.com/
The preferred formats are:
Parasolid ( x_t )
ACIS ( sat )
STEP ( stp, step )
I sometimes download all 3 formats, just to compare the import results between them.
REMEMBER: Unzip before you import into IronCAD!
You can also drag and drop files from Windows Explorer / Windows Desktop directly into IronCAD. No need to go File - Import - manual search - find - open...