If you can handle the electronic side, this seems like a simpler project than a full blown mechanical hobber.Ĭool! someone who has actually worked on one How are the plans for that machine? Are they legible? A stepper motor hooked to the worm of a dividing head or other workholding spindle to control the rev speed. A computer or standalone electronic dividing device linked to:Ĥ. Hooking an optical encoder to a milling spindle to capture the rev speed, the output being fed to:Ģ. As you know, the key element of a hobber is to synchronise the motions of the cutting and workholding spindles in the right ratio to generate the gear teeth. There have been a few interesting electronic solutions described in Model Engineers Workshop in recent years. Sadly, as you've found, there's not a lot of concrete information on the Web - most of the interesting stuff is locked up in paper publications. In issues 58, 59 and 60 of the UK magazine "Model Engineers Workshop" back in 1999 Harold Hall described the machining of the College Engineering castings. I think at one point their archives included copies of the original 1976 "Model Engineer" articles on the Jacobs machine but they were purged following threats by the publisher's lawyers. Their files and photos sections have some material on the Jacobs & other hobbing setups. It might be worth your while joining the Yahoo "Metal Working, Gear Cutting and Indexing" newsgroup here:
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