Carbon Steel vs Stainless Steel for CNC Machined Parts
Carbon steel and stainless steel are both common choices for CNC machined parts, but they behave very differently in the shop and in the field. If you’re deciding which one to buy, the best choice usually comes down to four practical questions: What environment will the part actually see (humidity, coolant residue, salt, cleaners, outdoor […]
Pilot Hole for #10 Screw: The Definitive Guide & Chart
My name is Clive. I’ve spent over 30 years as a machinist and fabricator, and I’ve seen more projects ruined by this one simple step th1an any other. A snapped screw, a split board, a stripped hole—these aren’t accidents; they’re the predictable result of bad information. Your Go-To Pilot Hole Chart First, let’s get you […]
Sheet Metal Fabrication Cost: Cut Our Client’s By 53%
You’ve got a design for a bracket, an enclosure, a chassis. It looks perfect in your CAD software. Now comes the hard part: getting it made without blowing your budget. You send out a request for quote (RFQ) to three different sheet metal fabrication shops and get back three wildly different numbers. One is bafflingly […]
GD&T Symbols: Common Mistakes (With Fixes + Examples)
GD&T (Geometric Dimensioning & Tolerancing) is supposed to remove ambiguity—yet many production delays still come from perfectly “legal” GD&T that’s hard (or expensive) to manufacture and inspect. This guide focuses on the most common GD&T mistakes we see in real RFQs and supplier–customer handoffs, using plain-language explanations and practical fixes. You’ll also get a short […]
What Is Quenching? Process, Stages, Media, and Examples
Quenching is a rapid cooling step used in heat treatment—most commonly after austenitizing steel—to “freeze in” a microstructure that delivers higher hardness and strength than slow cooling would. In plain terms: you heat the metal to the right temperature, hold it long enough, then cool it fast enough that the atoms don’t have time to […]
How To Passivate Stainless Steel (Citric vs Nitric + Tests)
Passivation is one of those processes that sounds optional—until you see a “stainless” part develop rust-colored spots around a machined edge, a tapped hole, or a weld seam. In most cases, the stainless alloy isn’t the problem. The problem is what happened on the surface during manufacturing: trace free iron, shop dust, smeared metal, or […]
Silver Melting Point: Does Silver Melt Before Gold?
If you’re asking “what melts first, silver or gold,” you might be coming from one of two places: You’re doing something practical—casting, soldering, brazing, heat-treat adjacent work, or reclaiming scrap—and you need a reliable temperature target. You’re comparing materials for a part that might see heat spikes and you’re using melting point as a quick […]
PMMA Vs Acrylic: What’s The Difference (And When It Matters)
If you’re reading quotes that say PMMA, drawings that say ACRYLIC, and a supplier who casually says “Plexiglass”, it can feel like you’re choosing between different plastics. In most purchasing and engineering contexts, you’re not. PMMA = polymethyl methacrylate (the polymer’s chemical name) Acrylic = the common industry name for PMMA So PMMA and acrylic are usually the same material. […]
Impeller Machining: 5-Axis CNC From Prototype To Production
Impellers sit at the center of rotating equipment performance. A small deviation in blade geometry, runout, or surface condition can show up downstream as vibration, efficiency loss, noise, cavitation risk, or shortened service life. That’s why impeller machining is less about “having a 5-axis machine” and more about controlling the entire chain: datums, toolpath strategy, […]
Zero Tolerance For Error: Aerospace Traceability That Works
Aerospace is going through a trust test. When high-profile programs hit quality headlines, the ripple effect lands on every buyer and supplier in the chain: tighter receiving checks, tougher questions about provenance, and less patience for “it’s probably fine.” I’m Clive, an engineer at Rapid Manufacturing. We machine precision components for demanding industries, and the […]
