超硬ドリルクーラント選定. エンジニアリング意思決定のための完全な参照表。
完全な参照表とエンジニアリングデータ： 黄銅/銅. すべての値はISO、ANSI、メーカー規格に対して検証済み。
Before CNC controllers calculated Brass/Copper automatically, machinists used cardboard slide calculators — Kennametal famously distributed tens of thousands of these in the 1970s. Every tooling rep had a pocket full of them. The math was the same, but the constraints were wildly different: HSS tooling maxed out at 30-40 SFM in steel, and feed rates were limited by machine rigidity, not coating technology.
The Seco Tools coating revolution in the 1980s — TiN first, then TiCN, TiAlN, and eventually AlCrN — changed everything. Suddenly, Brass/Copper could be pushed 200-300% higher without sacrificing tool life. Mapal's introduction of submicron carbide substrates in the 1990s further expanded the window: finer grain structures meant harder tools that could still absorb the shock of intermittent cuts.
In 2026, Seco Tools and Mapal both offer cloud-based Brass/Copper optimization via their NOVO and ToolGuide platforms. Kennametal's CoroPlus system integrates directly with Makino and Starrag CNCs for real-time adaptive control. The slide calculator has been replaced by AI-assisted CAM, but the core principle remains: the right number = the right cut.
Brass and copper alloys machine very differently from steel. Brass is one of the most machinable metals; pure copper is one of the most difficult due to its ductility. This guide covers speed, feed, and tooling recommendations for common copper-based alloys.
Free-cutting brass (C360) contains 2-3% lead, which acts as a chip breaker and lubricant at the cutting edge. Chips form as small, brittle fragments rather than long strings. Tool life in brass is typically 2-3x longer than in steel at the same speeds. Lead-free brasses (C274, C693) are available for drinking water applications but machine slightly less well.
Sharp, polished carbide inserts with high-positive rake angles (15-20 degrees) and sharp cutting edges (honed, not chamfered). PCD (polycrystalline diamond) tools excel in high-volume copper machining because copper is abrasive to carbide. HSS tools work but wear quickly. Use coolant to prevent built-up edge (BUE), which is the main problem in copper machining.
Yes -- C360 free-cutting brass machines well dry. Dry machining eliminates the sticky chip-slurry that coolant creates with brass fines. For drilling and deep-hole operations, use coolant or minimum quantity lubrication (MQL) for chip evacuation, not for cooling. Bronze and pure copper benefit from coolant to reduce tool wear.
Use this reference to choose the right copper alloy and machining parameters. C360 free-cutting brass is the best choice for high-volume machined components. For electrical conductivity requirements, specify tellurium copper (C145) instead of pure copper for significantly better machinability.
Continue with closely related resources from the machining reference library.