Materials
Steel, stainless steel, aluminium, brass and engineering plastics: material selection, machinability, certificates and costs in CNC manufacturing.
CNC Machining of Copper and Copper Alloys: Electrolytic Copper, Bronze and Special Brasses
Copper and its alloys form a wide range in CNC parts with their electrical conductivity, thermal conductivity, corrosion resistance and bearing properties; however, machining behaviour varies greatly between the gummy chips of pure copper and the hardness of aluminium bronze. This guide summarises the copper family from a CNC perspective for buyers and designers: overview table, pure copper, CuCrZr and high-strength coppers, bronzes, aluminium bronze, lead-free and special brasses, tolerance and measurement, material supply and price, designer notes and FAQs.
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CNC Machining of Titanium Grade 2 and Grade 5 (Ti-6Al-4V): Challenges and Sourcing Notes
Titanium, with its low density, high strength and exceptional corrosion resistance, is the material of choice for medical, aerospace, chemical and marine parts; machining it takes 3–5 times longer than steel and demands specialist knowledge. This article compares Grade 2 and Grade 5 properties, explains why titanium is hard to machine, covers cutting parameters, tooling, coolant, tolerances and surface finish, material supply and certificates, price structure, questions to ask a contract supplier, design notes for titanium and coatings and finishing operations.
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Quenched and Tempered Steels (42CrMo4, C45): CNC Machining and Heat Treatment Guide
The most widely used steel group for shafts, pins, gear blanks, bolts and hydraulic components is the quenched and tempered steels: C45, 42CrMo4, 34CrNiMo6, 25CrMo4. This article explains from the contract-manufacturing perspective in which delivery condition to buy the material, how machinability changes, when to harden before or after machining, how to manage distortion and grinding allowances, which surface-hardening options exist and what to demand in material certificates and heat-treatment reports.
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Series Production in Free-Cutting Steel (11SMnPb30, 9SMn28): When Is It the Right Choice?
Pins, bushes, fasteners, hydraulic fittings, adjusting screws and small turned steel parts produced in the millions are mostly made from free-cutting steel. This article explains the properties of the 11SMn30 / 11SMnPb30 / 11SMn37 grades (formerly 9SMn28, 9SMnPb28, 9SMn36), why they machine so fast, when they should not be used (welding, hardening, corrosion), plating options, lead restrictions and what determines the price of a series turned part.
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Brass Turned Parts: CuZn39Pb3 (MS58 / CW614N) and Swiss-Type Turning
Fittings, couplings, valve parts, connectors and sensor housings: a large share of the world's turned parts is made from CuZn39Pb3 (MS58 / CW614N) brass. This article explains the properties of free-machining brass, why it machines so efficiently on Swiss-type lathes, lead restrictions (RoHS, drinking water) and lead-free alternatives, plating options and the factors that determine the price when sourcing brass turned parts from Turkey.
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Stainless Steel CNC Parts: Guide to 1.4301, 1.4404, 1.4571 and 1.4305
Stainless steel is the indispensable material for CNC parts in the food, medical, chemical, marine and energy sectors; yet there are important differences between 1.4301 (304), 1.4404 (316L), 1.4571 (316Ti) and 1.4305 (303) in corrosion resistance, machinability and price. This guide compares the most commonly used stainless grades, explains the machining challenges and shows how to lower cost by choosing the right grade.
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CNC Machining of Aluminium (6061, 7075, 6082): Sourcing Guide for Turkey
Aluminium is the most requested material group in CNC contract manufacturing; yet 6061, 6082, 7075 and free-machining alloys differ markedly in machinability, strength, corrosion and anodising behaviour. This guide compares the aluminium alloys most commonly seen on European and US drawings, explains availability in Turkey and gives design tips that lower cost.
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