What is the difference for NC, NCSL and CNC machines?

NC is a standard hydraulic pipe bender, the feed and rotation are manual, and the bending is hydraulic and automatic.

NCSL is a semi-automatic pipe bender, mechanical gear feed, servo motor automatic angle rotation and hydraulic automatic bending.

CNC is a fully automatic pipe bender, servo motors for feeding and rotation, and hydraulic or servo motors for bending. Multiple tool stacks can be provided for two or more different bending radii (CLR).