Engineering
DFM and materials notes for plastic parts and mold steel selection.
7 guides · page 1 of 1
ABS injection molding: process window, design rules, grades and mold choices
Drying, melt and mold temperatures, wall and rib rules, ABS grades vs PC/ABS, mold steel and cost, and RFQ checklist.
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Delrin plastic (POM): properties, acetal vs Delrin, grades and processing
Delrin vs acetal copolymer, grades, machining and molding settings, and how to specify POM on a drawing.
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Surface roughness chart: Ra values, N grades and finish callouts
Ra, µin and N-grade chart, Ra by process, SPI mold finishes and how to write a surface finish callout without over-specifying.
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P20 vs H13 Mold Steel for Injection Molds
P20 vs H13 mold steel comparison for injection molds: hardness, life, polishing, cost and when each grade fits OEM…
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Plastic Part DFM Checklist for Injection Molding
Practical plastic part DFM checklist: walls, ribs, draft, gates, sinks and tolerances before you RFQ China injection…
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Die Casting Defects: Porosity, Cold Shuts, Flash and How to Prevent Them
Die casting defects such as porosity, cold shuts, flash, soldering and cracks: causes, die and process fixes, design…
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CNC Machining Tolerances Explained: What Should You Actually Specify?
Learn standard CNC tolerances, ISO 2768 and ISO 286 fits, how tolerance affects cost, and how to specify only what…
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Injection Molding Defects: Causes and Fixes for Sink Marks, Warpage, Flash and More
Troubleshoot sink marks, warpage, flash, short shots, weld lines and more. See likely causes, process and tool…
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Design for CNC Machining: Ten Design Mistakes That Increase Cost
Ten common CNC design mistakes, from sharp inside corners to deep pockets and blanket tolerances, and how to fix…
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Plastic Material Selection for Injection Molding: ABS, PC, PP, PA, POM and More
Compare ABS, PC, PC/ABS, PP, PA, POM, PBT and PMMA for injection molding. Learn how to choose by strength, heat,…
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