Posted by Don S on May 29, 2012 at 11:44:50:
In Reply to: Re: Tooth jump on internal gear from Fellows 7A shaper posted by Greg Scott on May 29, 2012 at 11:22:33:
Bill's comment is dead accurate. Making a dwell cut at full depth should clean up the fat tooth.
Most likely the drop-off corner of the depth feed cam is worn, ending the cycle early.
If you have a late production 7A, there is a cam timing mechanism on the rear of the machine. Tuning
it allows for minimizing overlap, or what we call the "knock-off" tooth. Confirm if present,
it's adjusted correctly.