Posted by Dimebag on February 26, 2005 at 05:09:31:
In Reply to: Question about cutting helical gears posted by ROBERT on February 25, 2005 at 18:35:45:
The spiral angle should be measured on the reference diameter, which is practically impossible to do with a protractor. Usually there's no feature on the gear, which allows seeing where the reference diameter is as it exists only in theory. You need this angle to be very precise- normally it comes from the very exact ratios in the machine gear train and can be checked by means of examining the contact path with the meshing gear or measured on a special device. Spiral angle is bigger on the outside diameter and smaller on the foot diameter, so in particular case it might be around 25 degrees when scratched and around 23 degrees at the full depth.
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