SMT Stepped stencils provide practical, workable solutions in a number of different applications:
SMT Stepped stencils can be created by a variety of manufacturing processes. Chemical milling (Chemical Etching), Laser Welding (Step up only) & Micromachining.
Datum produce multi-level, micro-machined step stencils in one continuous operation creating stepped stencils without distortion or burrs. Micro-Milling is the most flexible stepping method, able to create unlimited shapes, patterns, wall profiles and cavities.
All Datum materials are compatible with micro milling; for walls as thin as 20 µm, Datum Tension is suggested.
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Welding locally changes the thickness of the foil by cutting identical slugs from the base stencil foil and the same material of a different thickness. The replacement piece is then welded into place in the base stencil before laser cutting. All Datum materials are compatible with laser welding processes.
Micromachining, or micromilling, uses a very precise CNC positioning system with very small, hard cutting tools to remove steel without distortion or burrs. It is the most flexible stepping method, able to create unlimited shapes, patterns, wall profiles and cavities. It is the most economical method of creating stencils with -multiple steps, or stencils that need contact side relief for board snuggers or labels. All Datum materials are compatible with micromilling; for walls as thin as 20 µm, Datum Tension is suggested.