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00 00 Great Tips from This Issue 5 TRICKS OF THE TRADE CONTENTS April 2017 Volume 20 / Number 4 00 4 MoldMaking Technology —— APRIL 2017 Features 12 Hot Runners Optimize High-Performance Polymer Molding When molding high-temperature resins, direct gating with a hot runner system can save molders time and money. 18 Surface Treatment Solving the Part-Sticking Challenge Low-surface-energy mold coatings can eliminate part sticking, reduce cycle time and increase mold life. 22 Mold Design Get More Coolant Flow Through Smaller Bubblers This method for calculating the size of nonround water passages is designed to increase coolant flow, and reduce pressure loss and cycle time. 26 Education/Training This article is part of a series highlighting ways in which schools, businesses and trade organizations are working together to shape the next generation of manufacturing professionals. Strengthening Manufacturing through Advocacy Trade organizations are providing the guidance and resources needed to prepare students and women for careers in advanced manufacturing. ON THE COVER Image courtesy of Husky Injection Molding Systems. This month's cover shows a two-material hot runner with Ultra 750 and Ultra 500 valve gates for a complex automotive application. Husky's new Ultra Helix valve gates are designed for excellent gate quality and long life providing the lowest cost of ownership. See related story on page 12. Images above courtesy of (left to right) UPT, DZynSource LLC and Lake Park High School. 1. Take Care For high-temperature polymers, care must be taken to ensure that the hot runner manifold is thermally stable, with no dead spots or areas where the material can sit and degrade. PG. 12. 2. Stress Reducer Nanocomposite diamond- like-carbon coatings have molecular additives to reduce internal film stress and modify surface properties. PG. 18. 3. H 2 O Flow As the shape of a water passage deviates from round, the perimeter increases relative to the area of the opening. As the length of the perimeter increases, the pressure to force fluids increases. PG. 22. 4. Booth Kids To help promote manu- facturing to our youth at industry events, staff company tabletops and booths with apprentices who can better relate with young people. PG. 26. 5. Light Show Laser-cutting removes PCD material in very small increments using a highly concentrated, precise beam of light. PG. 56. 26 22 18 VIDEO ACCESS Departments 6 From the Editor: Rapid Training 6 What's New on MMT Online 8 Editorial Advisory Board: Ryan Katen, Micro Mold Co. 10 Profile: CS Tool Engineering 32 Case Study: Mold Maintenance/Repair 36 Maintenance Matters: Metrics for Assessing Maintenance Skills 38 International Perspective: European Trend Report 40 Skills Center: Shop Math 42 The Bottom Line: Changes to Revenue Recognition Requirements 46 Gardner Business Index: MoldMaking 48 End Market Report: Medical and Consumer Goods 50 Product Focus: Hot Runners and Mold Components 55 MoldMaking Marketplace 55 Ad Index 56 TIP: Cutting Tools