PCB Panel Vacuum Chuck Control: Holding Boards Flat for Drilling A vacuum chuck holds a panel flat on the machine table while it is drilled or routed, and it does the job with air pressure rather than with clamps. That makes it fast, repeatable and almost invisible, which is exactly…

Paste Inspection Frequency: Sampling and Trend Analysis Solder paste inspection measures the deposit after printing and compares it with the stencil aperture, so that a print problem is found before components are placed on top of it. How often that measurement is made is a decision about risk rather than…

Wave Solder Preheat Zone: Flux Activation and Board Temperature The preheat zone in a wave soldering machine does two jobs at once: it activates the flux so that it can remove oxide, and it brings the board to a temperature close enough to the solder that the wave does not…

DI Water Quality in PCB Wet Processes: Conductivity and Rinse Deionised water is the rinse medium for almost every step in printed circuit fabrication, from the rinse after etching to the final rinse before the surface finish is applied. Its job is to carry away dissolved salts without leaving anything…

Plating Bath Filtration: Filter Rating and Particle Contamination Plating baths are filtered continuously, and the reason is that particles do not stay in the solution. A speck of dust, a fragment of anode bag, a chip of dried plating salt or a flake of resist all end up deposited on…

Solder Paste Powder Size Selection: Type 3 to Type 6 Solder paste is a suspension of alloy spheres in flux, and the size of those spheres is specified as a type number with a corresponding particle range. The choice looks like a detail, but it decides how the paste behaves…

Solder Wave Height and Contact Time Control Wave height is the depth of solder that stands above the nozzle lip as the board passes over it. Set correctly, the wave touches the underside of the board across its full width and the board floats on the crest with a small,…

Lamination Separator Plates: 6 Rules for a Clean Press Book Lamination separator plates sit between the tooling plate and the panel, and they quietly determine whether a press cycle produces a smooth surface or a marked one. They distribute pressure, carry heat into the stack and keep resin flash from…

Solder Mask Curtain Coating: 6 Settings for Even Thickness Solder mask curtain coating covers one or both panel faces with a falling film of ink, which makes it fast and material efficient compared with screen printing. It also concentrates a great many variables into a single pass. If the curtain…

Plating Jig Maintenance: 6 Checks for Even Current Transfer Plating jig maintenance is the difference between a rack that plates evenly and one that produces panels with thin copper in one area and burns in another. The jig carries current from the busbar to the panel, and every contact in…