What tolerances can be achieved through precision metal bending?

What Tolerances Can Be Achieved Through Precision Metal Bending?

Standard Tolerance Ranges in CNC Metal Bending

Modern precision metal bending operations using CNC press brakes can typically achieve:

• Linear tolerances: ±0.2 mm for most dimensions

• Angular tolerances: ±0.5° for bend angles

• Bend position accuracy: ±0.15 mm with high-end CNC backgauges

These tolerances are suitable for critical assemblies in automotive, medical device, and telecommunication industries where repeatability and fit are essential.

Factors That Influence Bending Tolerances

1. Material Type and Thickness

• Softer materials like aluminum and copper allow tighter bends with less springback.

• Thicker materials introduce more variation due to elastic recovery and internal stress.

• For stainless steel above 3 mm, tolerances may widen to ±0.3 mm unless coining is used.

2. Tooling Condition and Die Setup

• High-precision punches and dies with consistent V-openings ensure repeatability.

• Proper die selection (typically 6–12× material thickness) minimizes deflection and edge distortion.

3. Machine Capabilities

• CNC press brakes with servo-electric or hydraulic control and real-time feedback can hold tighter tolerances than manual or air-powered systems.

• Machines with automatic crowning and adaptive angle sensors can maintain angular precision across longer bends.

4. Bend Length and Geometry

• Shorter bends maintain tighter tolerances.

• As bend length increases (especially above 1,000 mm), material springback and die wear may introduce deviations, requiring compensation.

Achievable Tolerances by Bending Method

Manufacturing Services for Tight-Tolerance Bending

Neway provides precision metal bending services with ±0.2 mm linear and ±0.5° angular tolerances. With CNC automation, in-house tooling, and 20+ years of experience, we support demanding specifications for industrial, automotive, and consumer electronics parts.