This is an animated 3D digital model pdf file that shows the workings of a spiral bevel gear drive for STEM classes. Important engineering concept. The preview shows the animation in action. You can pause animation, change colors, zoom in, rotate in 3D, etc. Created with professional 3D rendering software, this high quality simulation can also be used as clipart. You can also screen shot it in various positions to make posters for your STEM classroom. Great way to incorporate technology into you