Thread: Need help Fellow 7125A shaper/internal spline not backing off,rubbing flank of cutter

Newbie on internal splines. The flank of the cutter is rubbing the work on the upstroke. Are the guide blocks that control the backing off angle motion not correct or is it not backing off fast enough? Any one got experience with this. I have had machine for 20 years and only done external spline,wheel mounting splines etc. Never a problem. Is the cutter tooth count too big for the number of teeth in the work? Any one have ideas or experience what to look for?
Thanks. I have left and right guides and matching cutters unused if anyone is interested.
Wayne Mitchell 760-942-9170 wtmitchell28@yahoo.com

Having done a little work on an older model, there are adjustments to the machine for it to work with internal VS external.

Make sure the machine is backing off and not cramming the cutter into the work on the up stroke. As in trying to cut on the wrong side of the part.

The fellows manuals give quite a bit of info on setting it up.

Originally Posted by Wayne Mitchell

Newbie on internal splines. The flank of the cutter is rubbing the work on the upstroke. Are the guide blocks that control the backing off angle motion not correct or is it not backing off fast enough? Any one got experience with this. I have had machine for 20 years and only done external spline,wheel mounting splines etc. Never a problem. Is the cutter tooth count too big for the number of teeth in the work? Any one have ideas or experience what to look for?
Thanks. I have left and right guides and matching cutters unused if anyone is interested.
Wayne Mitchell 760-942-9170 wtmitchell28@yahoo.com

1). N.O.T in cutter to many?

2). Fellows handbook page 45-51 details procedures for apron back-off.

Cheers,

X2 on reading the manual. Also get a copy of, The Internal Gear published by Fellows.
Cutter rub is the bain of internal spline and gear cutting. Is typically due to any combination of,
number of teeth in cutter vs. work piece
work rotation direction
direction of back-off
angle of back-off
amount of back-off
day of week
etc.

You'll really hate life when the saddle retracts with the shank tool still inside the work piece.