Originally Published MPMN March 2005
Products from the MPMN Mailbox
Ultraminiature Toggles and Pushbuttons
Ultraminiature surface-mount toggle and pushbutton devices are available in single- or double-pole. The G3T and G3B series from NKK Switches (Scottsdale, AZ; www.nkkswitches.com) feature the company’s sliding twin crossbar (STC) contact mechanism. The contacts are goldplated and wiped clean with every actuation, providing a smoother, positive detent actuation and increased contact stability. Both toggles and pushbuttons are completely process-sealed for automated processing techniques. The bushing and housing are constructed of one molded piece, and a rubber O-ring surrounds the actuator. Epoxy-sealed terminals are molded to lock out flux, solvents, and other contaminants. Designed for use in low voltage, low current logic level applications, the devices have an electrical rating of 0.4 V A maximum at 28 V Ac/Dv maximum.
A UV material dispenser can be used in adhesive, doming, and other applications. The RP-1215 robotic dispensing system from Dispense Works Inc. (McHenry, IL; www.dispenseworks.com) can be optimized for use in dispensing UV cure materials. The system is available in sizes up to 50 X 100 in. travel for large-panel processing. Products remain stationary on the machine bed, while the overhead valve performs the dispensing pattern. All systems are available with a barcode input module, allowing the dispense pattern to be selected directly from a pallet or work order with minimal operator interface required. DXF, PLT, and G-Code files can be read directly from CAD or graphics programs.
A compact version of a machining center uses the same technology as more expensive models. The 51 X 51 in. footprint of the miniRaptor CNC machine offered by Datron Dynamics Inc. (Milford, NH; www.datrondynamics.com) also features a 20 X 20 X 8 in. working envelope with room for fixturing and batch-machining of small parts. Standard features include a 60,000 rpm spindle with 0.125 in. collet; a 3-tool automatic tool management system; Windows-based control software; a PC with 256 Mb RAM and 40 Gb part/program storage, CD-ROM and floppy drives, USB port, 15-in. monitor, keyboard, handheld controller, Ethernet networking and remote monitoring capability; a removable chip disposal tray; and a full machining-area enclosure with an industrial-grade door safety interlock system. An integrated ethanol mist coolant system eliminates secondary surface finish processes, such as deburring or degreasing.
A new line of surface-mount inductors and EMI filters is designed to offer high-performance EMI filtering with a minimal PCB foot print. The surface mount series from Spectrum Control Inc. (Fairview, PA; www.spectrumcontrol.com) consists of ferrite chip and power beads, ferrite inductors, ceramic chip inductors, three terminal chips, LC type chips, filter arrays, low-pass filters, high-frequency PCB filters, and mini PCB power filters. Products range from 5 to 2,000 Ω impedance, 1–12,000 nH inductance, capacitance from 22 to 220,000 pF, and operating temperatures from –40˚ to 120˚ C. The majority of the components are available in tape and reel, as well as bulk packaging. The filters are suitable for use in applications where smaller size is critical.
A preapplied self-sealing element achieves a gasket-like seal at pressures up to 500 psi and also eliminates in-house applications of O-rings, gasket seals, or sealant compounds. Nyseal sealant from Nylok Corp. (Macomb, MI; www.nylok.com) can be permanently fused on the bearing surface of a fastener. As the screw is seated to its final position against the mating part, the product compresses slightly and fills the void under the bearing surface of the head and countersink or bore, covering 360°. Effective in sealing applications involving hydraulic fluids and water, the sealant prevents galvanic corrosion between dissimilar materials. No additional curing or heating is required after installation. Fasteners treated with this coating are reusable, and age does not contaminate the sealant.
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