I think I understand what you are asking, but will not swear to it. But here goes:
1. Set your maximum depth of cut on your lowest stop on the rotating depth-setting turret. If there is a protruding screw and locknut, you may need to loosen the nut and screw the screw (usually has a recess for a screwdriver) in as far as possible, and re-lock the nut. Loosen whatever holds the depth-of-cut rod or gauge, allow it to make contact with the turret stop, tighten up again, do not change.
2. Rotate the turret to the next stop, set as above, for 2/3 of the depth of cut.
3. Repeat again with the next stop on the turret for 1/3 depth of cut.
You start the cut plunging down to the third stop (i.e 1/3 of depth), then work you way down on the repeat cuts.
If I misunderstood, apologies, please re-phrase.
1. Set your maximum depth of cut on your lowest stop on the rotating depth-setting turret. If there is a protruding screw and locknut, you may need to loosen the nut and screw the screw (usually has a recess for a screwdriver) in as far as possible, and re-lock the nut. Loosen whatever holds the depth-of-cut rod or gauge, allow it to make contact with the turret stop, tighten up again, do not change.
2. Rotate the turret to the next stop, set as above, for 2/3 of the depth of cut.
3. Repeat again with the next stop on the turret for 1/3 depth of cut.
You start the cut plunging down to the third stop (i.e 1/3 of depth), then work you way down on the repeat cuts.
If I misunderstood, apologies, please re-phrase.