JLCCNC Blog

CNC Machining Fundamentals

Trochoidal Milling: Complete Guide to High-Efficiency CNC Machining

Key Takeaways Trochoidal milling combines circular cutter motion with continuous forward feed. The cutter normally engages 5 to 20% of its diameter instead of making a full-width cut. A smaller engagement angle limits force changes during slotting and pocket roughing. Low radial engagement often allows greater axial depths of cut than conventional slot milling. CAM software calculates the circular path automatically from the selected machining parameters. This strategy is widely applied to titanium, s......

Jul 08, 2026

Surface Finishing Processes

Understanding the role of surface finish in CNC machining: how to improve part performance and life?

In precision manufacturing, surface finish is one of the core indicators of CNC machining quality, directly affecting part friction performance, sealing, corrosion resistance and fatigue life. Whether it's aerospace gears or medical implants, precise control of surface roughness (Ra value) has become the key to breaking through technological barriers. In this article, we will analyse the definition of surface finish, influencing factors and optimisation strategies, and share how to achieve the ultimat......

Jul 08, 2026

CNC Machining Fundamentals

What Is Die Casting? Process, Materials, and Applications

Key Takeaways Die casting is a metal casting process that forces molten metal into a reusable steel mold under high pressure, producing parts with tight tolerances and good surface finish at high volume. Aluminum die casting is the most common form by far, thanks to its combination of light weight, decent strength, and good corrosion resistance. The die casting process runs through mold preparation, injection, cooling, and ejection in a cycle that can repeat every few seconds to minutes depending on p......

Jun 30, 2026

CNC Machining Fundamentals

First Angle vs Third Angle: Understanding Orthographic Projection Methods

Key Takeaways Orthographic projection is the system that lets a 3D part be represented through multiple 2D views, front, top, side, and so on. First angle projection and third angle projection are the two standard methods for arranging those views, and they place views in opposite positions relative to the object. First angle projection is the ISO standard used across most of Europe, India, China, Russia, and many other countries following ISO standards Third angle projection is the standard in the Un......

Jun 29, 2026

Design Tips & Best Practices

True Position in GD&T: Symbol, Formula, Tolerance, and Manufacturing Applications

Key Takeaways About True Position True position defines the allowable variation in a feature's location from its basic dimensions. The control applies to holes, slots, pins, threaded features, and datum features. A circular tolerance zone controls features in 2D, while a cylindrical zone controls feature axes in 3D. Datum references establish the coordinate system used for manufacturing and inspection. Maximum Material Condition (MMC) adds bonus tolerance as the feature departs from its maximum materi......

Jun 29, 2026

Tools & Cutting Instruments

CNC Probing Guide: How CNC Probe Systems Work, Applications, and Benefits

Key Takeaways About CNC Probing CNC probing is on-machine measurement that replaces or reduces manual setup and inspection steps. A CNC probing system combines a probe body, stylus, signal transmission, and controller integration to measure workpiece position, tool length, feature dimensions, and surface location. CNC probing solutions range from basic workpiece location routines on a manual machine to fully automated in-process verification in unattended manufacturing cells. CNC probing simulation le......

Jun 27, 2026