Link to audiobook → https://www.dropbox.com/scl/fi/v3tonol7cwxoy3s97p7gu/Understanding_the_true_nature_of_your_injection_molded_part_McFadden_21March2026.mp3?rlkey=hhyosvlhfpuycjq7uzjnfgsx4&st=kz7hvn3q&dl=0

Part One — From Furnace to Finished Casting: The Designer's Journey

Most design guidelines tell you what to do. This guide explains why — and what actually happens to your part when you get it wrong. Part One of the High Pressure Die Casting series takes engineers who design die cast parts through the complete production journey, from the moment metal is melted in the furnace to the moment the casting is ejected from the die. Along the way it covers the difference between cold and hot chamber machines, what aluminum, zinc, and magnesium each demand from the designer, and how decisions about wall thickness, draft angle, ribs, and section changes play out in milliseconds of metal fill. Part of the Combating Engineering Mindblindness series.

Part 1 Audiobook link → https://www.dropbox.com/scl/fi/zdfj585z22aovmq0lypmq/Designer_Journey_HPDC_part1_McFadden_7May2026.mp3?rlkey=809ypvtftrfai7bhijsnbt922&st=8cl697jj&dl=0

Part 1 — The Complete Journey We start at the furnace, not the gate. Because the part carries its history. Hydrogen absorbed in the melt. Air entrained in a rushed slow shot. Residual stress locked in during solidification. All of it shows up later — usually at the worst possible moment. We walk through furnace practice, machine architecture, shot ratio, die spray, plunger lubrication, slow shot, fast shot, intensification, and solidification. The goal is understanding why each step matters, not just memorizing the settings.

Part 1 Audiobook link → https://www.dropbox.com/scl/fi/krhnycrk65tyvopuc6ild/Pro_Version_Part_1_Journey_HPDC_Journey_8_May2026.mp3?rlkey=2533oa1edaoqcvzlaewbr4hd2&st=rse5zvoe&dl=0

It All Begins Here

Part Two — Gating, Porosity, Surface Treatments & Design for Manufacture

The finish on your die cast part does not tell you the truth. The naked casting does. Part Two picks up where the production journey ends and goes deeper into the decisions that follow — the gating system and what it means for weld lines and flow quality, porosity and its roots in design choices, and why every designer should see the as-cast shot before any plating or coating is applied. It also covers the metallurgical consequences of surface treatment specifications, what shot ratio and melt condition mean for part integrity, and how to design for the secondary operations that follow casting. Part of the Combating Engineering Mindblindness series.

Part 2 Audiobook → https://www.dropbox.com/scl/fi/b4i0uislu4968c14gsdmh/Designer_Journey_HPDC_part2_McFadden_7May2026.mp3?rlkey=rvpbn09tub1vhk33m9qoungz3&st=f60re4ju&dl=0

Part 2 — Die Meets Machine This is where the math and the metal shake hands. PQ² analysis — the engineering handshake between your die design and the machine's capability — tells you whether what you designed will actually run. We cover fan and tangential runner design, overflow sizing, vent area calculation, vacuum systems, freeze blocks, and simulation strategy. There's also an expanded section on modern AI-assisted defect prediction, building on the foundation Mike Ward established in the original NADCA Gating Manual.

Audiobook part 2 → https://www.dropbox.com/scl/fi/b2giplw3cuud162zt4n36/Pro_Version_Part_2_Journey_HPDC_Journey_8_May2026.mp3?rlkey=myvussw44ozyiuo03bwgq34qu&st=pdfui0jh&dl=0