How do you use CPC-HOB to set up a hobbing machine with tangential hob shift?
You don’t want to confuse hob shifting discussed here with manual or automatic “step” hob shifting. Hob shifting that occurs away from the workpiece has no effect on basic hobbing change-gear setup. Some machines are designed to allow continuous hob shift tangential to the workpiece during cutting. This is one method to cut throated worm gears (an alternative to radial infeeding). This type of hob shifting (AKA tangential feed or diagonal feed) requires an adjustment to the lead change gear ratio. In other words, a spur gear (or throated worm gear) could not be cut without a differential action that compensates for the motion of continuous hob shift. Said another way, tangential hob shift, by itself, would cut helical teeth on a spur gear (although you would not purposely cut helical gears this way for a number of reasons). Without compensation, tangential feed would cut off all teeth while trying to cut a throated worm gear. The Lead adjustment due to tangential hob shift could be tho
