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.
Fellows Gear Shaper Website
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