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76 SMT Magazine • November 2015 for instance, from working. Selective soldering systems can cost $30,000 and up. • Pros: Very repeatable and controllable environment; scalable: throughput can be increased by adding modules • Cons: Fairly costly, fairly slow; can require intensive operator training but can be mitigated by available software options; very process driven related to the topography of the board Don't Forget: Always Check references Remember to consult a variety of machine providers, talk to the manufacturers themselves if possible, and get references to contact before making a purchase. An important consider- ation for a complex machine such as a wave or selective soldering system is factory support, specifically training, software, upgrades and spare parts. Next chapter: Details on wave soldering systems. SmT robert voigt is vp of global sales at DDM novastar Inc. To reach voigt, click here. Figure 5: Solder application, viewed from under the circuit board. figure 6: example of a selective soldering system. sMT quIck TIps SeLeCTING A THroUGH-HoLe SoLDerING SySTem, PArT 1