TurboCAD

Use the TurboCAD help menu for information about any item in italics below. You will be creating a threaded bolt in model space with a hexagonal head. Your bolt should be like the one in the foreground in the image shown. Click on it to enlarge.
Create a triangle in Model Space using the Irregular Polygon tool.
Use the Revolve tool to transform the 2D triangle into a 3D ring. You may have to undo and redo this several times until the triangle is pointing outwards.
Right click on the ring ('spin') and select Properties. Click on "Revolution shape".
Count the number of treads in the image above and enter that for "Number of coils" and click "Ok" to view the coil. Note that the coil may still look like a ring until the pitch of the threads is changed as described below.
Now go back to Properties and adjust the "Spiral Pitch" until the coils touch and perhaps overlap a bit. Notice that "Sections per Spiral Coil" and "Smooth" also have an effect on your rendering.
Use a cylinder to make the unthreaded part of the bolt.
Use the Polygonal Prism tool to make the head of the bolt.
Use the Blend Edges tool to round the top edges of the hexagonal head.
Change the surface appearance of the bold using the following: Properties -> 3D -> Materials & Category. Select Metals and Stainless Steel.
Save your TurboCAD file as week14.tcw and upload it to your FTP directory.