JLCCNC Blog

Design Tips & Best Practices

How to Read Engineering Drawings: Symbols, Dimensions, and Practical Interpretation

Key Takeaways About Engineering Drawings Engineering drawings communicate product requirements throughout manufacturing, inspection, assembly, and quality control. They communicate information that may not be fully defined in a CAD model, such as allowable variation, surface requirements, and inspection points. A drawing review starts with understanding the part reference system. The machinist checks which surfaces are used as datums, how features relate to each other, and which areas need access duri......

Jun 18, 2026

Design Tips & Best Practices

Design for Manufacturing (DFM): Principles, Guidelines, and Cost Reduction Strategies

Key Takeaways About DFM Design for manufacturing (DFM) is the process of designing products that are easier, faster, and less expensive to manufacture. Good DFM design reduces production cost long before a part reaches the factory floor. Most manufacturing costs are locked in during the design phase, not during production. Following proven design for manufacturing guidelines helps reduce machining time, material waste, tooling complexity, and assembly issues. Effective DFM improves product quality, sh......

Jun 17, 2026

CNC Machining Fundamentals

Contour Milling: Toolpaths, Surface Machining, and CNC Programming Considerations

Key Takeaways and Introduction About Contour Milling CNC machines can contour outer edges, inner limits, curved faces, and intricate shapes. The result relies on cutter shape, motion strategy, operating values, and program checks. Accurate dimensions call for engagement, spacing, movement, and setup. Methods can handle planar, freeform, and deep features, as well as multi-axis work. Material behavior, tool reach, vibration, deflection, and cycle duration affect consistency. Uses include molds, aerospa......

Jun 16, 2026

Tools & Cutting Instruments

Drill Point Angle: Selection, Materials, and Drilling Performance

Key Takeaways About Drill Point Angle A 118° point is used most often in steel and aluminum jobs because it drills without special setup changes on standard machines. 135° points show up more in stainless and tool steel work since they keep the drill from pushing hard at the center during entry. In aluminum and similar ductile materials, chips often come out in long strands when the point geometry does not support breakage. Hole entry stays more consistent when the drill point matches the material ins......

Jun 16, 2026

Surface Finishing Processes

Laser Etching: Complete Technical Guide to Process, Materials, and Industrial Applications

Laser etching is widely used in manufacturing, product design, and industrial marking. However, it is often confused with laser engraving and laser marking, which can lead to incorrect process selection. This guide explains its core principles, process, materials, and industrial applications in a structured way. H2: What Is Laser Etching? H3: Engineering Definition of Laser Etching At its core, laser etching is a process that uses a focused laser beam to alter the surface of a material permanently. Un......

Jun 15, 2026

CNC Machining Fundamentals

CNC Clamping Methods: Types, Placement, and Machining Stability

Key Takeaways About CNC Clamping CNC clamping secures the workpiece against cutting forces while avoiding the distortion that over-clamping or poor placement introduces. Clamp placement relative to cutting forces matters more than clamp quantity. The 3-2-1 locating principle provides the theoretical foundation for stable, repeatable workholding without over-constraining the part. Different clamp types, mechanical, vacuum, magnetic, hydraulic, suit different materials, geometries, and production volume......

Jun 13, 2026