FILENAMES: G_CUTTER.GIF G_HOBBER.GIF g_hobber.txt G_SHAPER.GIF g_shaper.txt G_TRAIN.GIF g_shaper2.jpg DESCRIPTION: These are scans from a book about gear cutting. Posted by Errol Groff . Errol provided the following description: ================================================================= I operated both gear hobbers and shapers many years back when I was an apprentice lad at Pratt and Whitney Machine Tool in West Hartford CT.. To answer Steve's question I searched for a bit on the web hoping to find some illustrations of the two machines but without success. Off my bookshelf came a text titled Spur Gears by Eliot Buckingham published by McGraw Hill 1928 publication date. I scanned some illustrations and text which do a good job of describing the different actions of hobbing and shaping. I didn't reslize how large the files were and aplolgize to all. My scanning skills leave a lot to be desired and if anyone can suggest a wev site to help me learn more about how to all suggestions will be accepted. Files are found at http://www.metalworking.com/dropbox/ and are: gcutter.bmp, ghobber.bmp, ghobber.txt, gshaper.txt, and gshaper.bmp. The shaper illustration shows the cutter of the left and the gear blamk on the right. The text describes the cutting action. The hobber illustration shows the cutter (hob) on the bottom and the gear blanks on the top of the set up. Modern gear hobbers may be horizontal like the illustration or veritcal. The principal of cutting is the same.