Our liner cutting table has the "Tangential Control" built into the machine controller software, so CAMduct doesn't need to output any control codes for it.

Our controller software setup has a tick box for "Tangential mode" and when enabled it controls the asigned axis to keep the knife blade tangential to the direction of cut. It also has a setting to control how far the knife is allowed to rotate within the material before it needs to lift out and rotate on tighter corners.

I would suggest you talk to your machine supplier and find out if "tangential mode" is in their controller or if the axis control codes needs to be in the nc code.

If it needs to be in the nc code then the CAMduct post processor you are using needs to support tangential mode.