A professional who prepares cylinders for installation in flexographic printing press according to specifications and diagrams. Responsibilities include:

• Measures and cuts brass plate of specified dimensions, using rule and blade-shearer, and bends plate to fit curvature of cylinder, using plate curver.
• Lifts and places printing cylinder of specified size on proof machine holding-rack.
• Measures and draws centering lines on cylinder to be used as guides for alignment of plate and dies.
• Slides formed plate on cylinder, positions plate according to centering lines, and clamps plate in place with tension bands.
• Trims and bevels rough edges of rubber dies, using knife.
• Positions dies on cylinder plate, following guide markings and diagrams, and fastens dies to plate with adhesive paper.
• Applies ink to dies with roller, and operates proof machine to make trial impression on proof paper.
• Examines proof to detect typographical or compositional errors and to verify quality and registration of print.
• Measures thickness of mount with micrometer to verify tolerance.
• Rejects defective dies and remounts or repositions dies to correct errors in original setup until trial impression meets quality standards.