Industry

Before the pick-and-place machine places a single component, before the reflow oven melts a single solder joint, the stencil printer must do its job perfectly. The stencil printing process deposits solder paste onto PCB pads. If the print is wrong – too much paste, too little paste, misaligned, or smeared – no amount of placement accuracy or reflow optimization will fix it. Stencil printing is often called the "most critical" process in SMT, and for good reason: 50-70% of all SMT defects originate in the printing process. This article covers the key parameters of stencil printing: stencil design, squeegee selection, print speed, separation speed, under-clean frequency, and paste management on the stencil. Master these, and you eliminate the largest source of defects before they start.

Ask any SMT line supervisor about their biggest headache, and feeders will be near the top of the list. Feeders are the most numerous moving parts on a pick-and-place line. A typical machine may have 80-120 feeder lanes, each with its own tape advancement mechanism, cover tape peel system, and pickup position. When feeders work well, the line runs smoothly. When feeders fail, nothing works. Yet feeders are often maintained reactively – only after pick failures spike or components start skewing. This article provides a practical guide to feeder maintenance, covering mechanical and electronic feeders, common failure modes, cleaning procedures, and calibration. A disciplined feeder maintenance program can reduce pick failures by 50-80% and extend feeder life by years.

A pick-and-place machine is a significant investment. Like any precision equipment, it requires regular maintenance to perform at its best. Yet many SMT lines operate on a "run until failure" philosophy – lubricating only when noises appear, cleaning nozzles only when pick failures spike, and calibrating only after defects have already been produced. This reactive approach costs money in rework, downtime, and shortened machine life. This article provides a practical maintenance checklist broken down by daily, weekly, and monthly tasks. Designed for operators and maintenance technicians, this guide covers nozzles, feeders, vacuum system, linear guides, vision system, and calibration. Print this checklist and post it near your SMT line – it will extend machine life, reduce defects, and improve overall equipment effectiveness (OEE).

For those new to surface-mount technology (SMT), few processes seem as mysterious as reflow soldering. Components are placed on a board covered with sticky solder paste, the board enters a long oven, and moments later – perfectly soldered joints emerge. But what actually happens inside that oven? Why do some boards come out with bridges or tombstoned components? This article provides a complete, beginner-friendly guide to the reflow soldering process. We will explain the four stages of a reflow profile, the role of solder paste flux, how to choose the right profile for your product, and the most common defects and how to prevent them. Whether you are setting up your first SMT line or training new operators, this guide will give you a solid foundation.