Appliance Design - January 2009 - (Page 35)

PLASTICS & PLASTIC PARTS Mold Side A with window height (shutoff height), as shown in Fig. 11. Most CAD programs can help determine the proper degree of wall draft to create the required 3 degrees of draft at the shutoff. Mold Side B Conclusion Wherever a surface of a mold is parallel to the direction of mold opening (or cam withdrawal), the surface must be drafted to avoid damage to the mold or the part. A number of factors determine the degree of draft including part geometry, wall height, and surface texture. If, for any reason, the surface cannot be drafted, it may be possible to form the part using side action cams. On the other hand, drafting a surface may actually eliminate the need for side action cams in forming certain features in or on that surface. 3D CAD programs can simplify the process of adding draft. For designers who are uncertain where, or how much draft is necessary, analytical programs like Proto Labs’ free online ProtoQuote™ system can help provide guidance.< For more information, E-mail: customerservice@protomold.com Fig. 11. Illustration of how draft can be used to avoid side actions. Arrow at right shows the direction the mold will open. The triangular green area shows the extension of the mold’s A side. The triangular blue area shows the extension of the mold’s B side. Allegro’s Integrated, Low Power Current Sensors for Energy-Efficient Applications Small Form Factor, High Bandwidth Hall-Effect Sensor Solutions Allegro’s newest family of Hall-effect current sensors were designed to maximize efficiency and minimize power loss in consumer appliance, hybrid vehicle, and renewable energy applications. The Allegro family of products combines high voltage isolation and a low resistance current conductor to offer a non-intrusive means of measuring both high and lowside currents. Allegro’s high bandwidth circuit design and package technology innovations offer high accuracy, low profile, cost-effective sensing solutions for power monitoring, motor control, and short circuit protection applications. Features ■ Integration and Package Innovation Create Small Form Factor Solutions Low Resistance, Integrated Conductors: 100 μΩ Resistance 125 kHz ■ 2.1 to 3.0 kVRMS Voltage Isolation Enables High Side Current Sensing Electrostatic Shield Provides dV/dt Immunity ■ ■ ■ www.allegromicro.com/promo635 115 Northeast Cutoff, Worcester, MA 01606 USA ■ 508.853.5000 High-Performance Power ICs and Hall-Effect Sensors AD01094Alle.indd 1 www.applianceDESIGN.com applianceDESIGN 12/2/08 1:29:17 35 January 2009 PM http://www.allegromicro.com/promo635 http://www.allegromicro.com/promo635 http://www.appliancedesign.com

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Appliance Design - January 2009 Contents Editorial Shipments/Forecasts News Watch Supplier Spotlights Commercial Appliances Plastics & Parts Electronics Motors Design Marts Association Report: NAFEM Advertiser’s Index

Appliance Design - January 2009

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