Page 5 Modeling a Tank: Wheels and Tires

Hit Dir and select one of the threads to make sure the normals are facing out and flip if necessary.

Select the tread Polysurfaces and hit Array and in the front view select the center of the wheel as the center of array and type in 18 when prompted for 'Number of elements.' Result shown below.

Turn on layer 'bolt curves.'

Select the 6 sided shape and hit Extrude 'Cap=Yes' and extend it back so that the bolt extends through the wheel so that it will show on the opposite side or type in 230.

Select the resulting surface and hit Array and use the center of the wheel as the center of array and type in 8 for 'Number of elements.'

Select everything SelAll and hit JoinSrf and save the file as wheel.3dm