Posted by John Cerra on December 12, 2007 at 14:17:51:
In Reply to: Hobbing Machine posted by Walmir Fernandes Navarro on December 12, 2007 at 10:31:15:
A differential is a gear train on your hobber
that establishes a relationship between the index and feed trains. For a spur gear ..... no need. Helical gears, on the other hand require this relationship in order to produce a given helix. Given the diff. constant of your machine and the correct foumula, you can easly set up your helical job.
Helicals on a non differential can be produced using index and feed formulas that take the helix into account .... no differential necessary. The helical formulas are probably in the machine manual. If not, we'll get then to you.
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