Re: Breaking of hob when cutting high helix angle gears


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Posted by Dan McEachern on July 30, 2003 at 14:53:11:

In Reply to: Breaking of hob when cutting high helix angle gears posted by Russell on July 29, 2003 at 12:06:04:

Russell- with a L.H. hob the blank will be rotating into the hob. The blank would be turning CCW looking down on the work arbor on a vertical machine. Your infeed rate of about .010"/rev.on a high helix gear (assuming you are plunging into solid material) will put the cutting load across the full width of the hob face and place an equivalent force on the blank. If you are using a nut arbor, the force and direction of rotation may be enough to unscrew the nut to the point where the blank shifts. It would seem that 20 gears might be enough for the hob to get slightly dull, increasing the force on the blank enough to rotate it. Hope this helps. Dan


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