Expert Machining Knowledge from the Shop Floor

CGS Tool has manufactured USA-made solid carbide end mills for over 50 years. This blog shares field-tested knowledge on cutting tool selection, coating technology, machining parameters, and precision engineering — written for machinists, process engineers, and manufacturing professionals who demand real-world guidance backed by decades of cutting tool expertise.

Latest Articles

Featured Post
Tool Selection Guide 🕑 12 min read

The right carbide end mill — matched to material, operation, and machine capability — delivers better productivity, longer tool life, and tighter tolerances. This guide covers geometry fundamentals, advanced coatings, and CGS Tool series recommendations for every major material type.

End Mill Geometry Carbide Coatings ALTiN / nACRo / ZrN Helix Angle Flute Count Variable Helix Eccentric Relief Speeds & Feeds Tool Life Titanium Machining Aluminum Machining Chatter Elimination
Read Full Article

What's Covered in This Article

End mill geometry: flute count, helix angle, end configuration

ALTiN, ZrN, nACRo & AlCrN coating science and comparison

Variable helix & variable index for chatter elimination

Eccentric OD relief vs. hollow-ground relief explained

Material-by-material carbide end mill selection guide

CGS Tool series recommendations by application type

Real-world case studies: aerospace, automotive, titanium

How to maximize tool life and reduce cost per part

New Article
Tool Geometry & Design 🕑 14 min read

The OD relief ground behind a carbide end mill's cutting edge has a direct impact on edge strength, wear resistance, and tool life — yet it's rarely discussed. This guide breaks down concentric vs. eccentric relief, compares real-world performance, and explains why CGS Tool builds eccentric relief into every series as standard.

Eccentric Relief Concentric Relief Cutting Edge Strength Tool Life OD Relief Geometry Wear Resistance High-Feed Machining Hardened Steel Titanium Surface Finish
Read Full Article

What's Covered in This Article

Concentric (hollow-ground) relief: geometry and limitations

Eccentric relief: how convex geometry reinforces the cutting edge

Side-by-side comparison: edge strength, wear, tool life, feed rate capability

Why eccentric relief outperforms in hardened steels & titanium

Interrupted cutting, high-feed strategies & edge fracture resistance

Surface finish consistency over full tool life

CGS Tool series that feature standard eccentric OD relief

Matching relief geometry to your specific application

More Articles Coming Soon

Machining Parameters

Speeds & Feeds for High-Performance Carbide End Mills

A deep dive into optimizing cutting parameters by material, series, and machine spindle capability.

Material Focus

Titanium Machining: Why the Right End Mill Changes Everything

VMax series, nACRo coating, and the engineering decisions that make Ti-6Al-4V manageable at production speeds.

Coating Technology

ALTiN vs. AlCrN vs. ZrN: Choosing the Right End Mill Coating

Breaking down coating chemistry, temperature performance, and application suitability for each material class.

Tool Geometry

Variable Helix & Variable Index: Eliminating Chatter at the Source

The physics of harmonic disruption and how CGS Tool geometry delivers smoother, faster cuts.

Application Guide

Deep Pocket Milling: Rigidity, Reach, and Reduced Neck Design

Strategies and tool specifications for maintaining accuracy and surface quality in deep-pocket applications.

Industry Insight

General Purpose vs. High Performance: When to Step Up Your Tooling

How to evaluate production requirements and justify the move from standard to premium carbide end mills.