The Role of Stencils to PCB Fabrication
It is now possible for anyone to add a stencil to any PCB fabrication. Also, the stencils could be used to create prototype circuit board. The process is detailed and requires that you go through a large number of steps. It starts with the specification of the design all through to the electrical design. It moves to the symbolic notation which then culminates into the assembly of the boards. The increased number of components which are available on the surface mount packages, prototype assembly, has made it possible to move away from hand assembly. It allows for making use of the stencils to simplify the assembly process. Soldiering the iron in and around is not just difficult but is a tough exercise. The components are lightweight, and therefore can move them to any other part of the board.
When it comes to the assembly process, the solder paste should be added to the board's screen. The paste could come in the form of framed stencils and prototype stencils. The picking and placing the components could either be done by machine or by hand. Typically, technicians use tweezers to arrange the components and place them on the board. The tension created by the solder paste is sufficient to help keep the components in place. The pick and place machines may be used to place the components on the board. It uses orientation information which is held in the Centroid file to help place the components on the board with ease.
How Is The Stencil Used?
The stencil is customized on the board that is being assembled. It is made of a solid sheet of material such as Mylar, copper, and aluminum. You can obtain an already made stencil or make one by yourself. Similarly, you can order for a readymade stencil from a manufacturing company.