6061-T6 Aluminum CNC Machining Guide

6061-T6 is the most widely used general-purpose aluminum alloy for CNC machining, offering excellent machinability, weldability, and moderate strength.

Engineering Specifications & Parameters

Density	2.70 g/cm³
Hardness	95 Brinell (HB)
Yield Strength	276 MPa (40,000 psi)
Machinability Rating	90% (Very High)
Recommended Cutting Speed	250 - 600 m/min

Overview

6061-T6 aluminum is precipitation-hardened and contains magnesium and silicon as its major alloying elements.

Machining Characteristics

Chip Formation: Produces continuous, easily manageable chips with proper feed rate.
Surface Quality: Capable of achieving Ra 0.8 μm or better surface roughness.
Coolant: Flood coolant is recommended to prevent chip re-welding.

Frequently Asked Questions

Why is 6061-T6 preferred for rapid prototyping?

It combines low raw material cost, fast machining cycle times, and excellent anodizing compatibility.

What cutting tools are ideal for 6061 aluminum?

2-flute or 3-flute uncoated or DLC-coated carbide end mills with high rake angles.