Initial Reserved Length: If the machine needs to clamp or discard some material at the feed in end, that length is reserved using the value specified here.
Final Reserved Length: If the machine needs to clamp or discard some material at the far end, from where the material is fed in, that length is reserved using the value specified here.
Kerf: If the cutting process loses material, the value specified here denotes the amount of material that is lost between cut pieces.
For more information, see Installed Machines and Setting Up a Machine.