How to Choose a CNC Press Brake: Key Technical Factors

Guide

To choose a CNC press brake, evaluate five key factors: bending force (tonnage), bending length , drive system (hydraulic vs. servo-electric), CNC controller (Delem, Cybelec, or ESA), and after-sales support in your region. For precision work, require ±0.01 mm repeatability. For energy efficiency, choose all-electric servo models.

Factor 1: Bending Force (Tonnage)

Bending force, measured in kilonewtons (kN) or metric tons, determines the maximum material thickness and length the machine can bend. The required tonnage is calculated based on material tensile strength, sheet thickness, and V-die opening width. As a rule of thumb, bending 3 mm mild steel across a 3,000 mm length requires approximately 100 tons of force. Always select a machine with 20–30% headroom above your calculated requirement to allow for tooling wear and material variations.

According to ISO 16090-1 (Machine Tools Safety — Machining Centres), press brakes must incorporate overload protection systems to prevent structural damage when bending force limits are exceeded. Verify that your prospective machine complies with this standard.

Factor 2: Bending Length and Back Gauge

Bending length (the distance between the machine's side frames) must accommodate your longest workpiece. Standard lengths range from 1,600 mm to 6,000 mm for industrial machines. The back gauge — the CNC-controlled stop that positions the sheet — is equally important. Premium machines like the Yawei PBM feature 6-axis back gauges (X, R, Z1, Z2, X', R' axes) for complex multi-bend programs.

Yawei PBC Series — high-performance electro-hydraulic press brake with multi-axis back gauge

Factor 3: Drive System — Hydraulic vs. Servo-Electric

The drive system is the most consequential technical decision when selecting a press brake:

Conventional Hydraulic High force, low cost High energy use, oil maintenance Heavy plate, budget buyers

Electro-Hydraulic Servo High precision, energy savings Higher upfront cost Precision fabrication

All-Electric Servo 60% energy savings, no oil Lower max tonnage Thin sheet, clean environments

Yawei PBE — all-electric servo drive eliminates hydraulic oil, reducing energy consumption by up to 60%

The CNC controller is the brain of the press brake. For global buyers, prioritize controllers with established spare parts networks and multilingual interfaces. The three most widely supported brands are:

Delem (Netherlands): DA-53T (2D) and DA-69T (3D) are industry standards. The DA-69T supports automatic tool setup, 3D bend simulation, and network connectivity.

Cybelec (Switzerland): ModEva series offers advanced graphical programming and is popular in European markets.

ESA (Italy): S630 and S660 controllers are cost-effective alternatives with solid functionality.

Avoid proprietary controllers from lesser-known brands, as spare parts and software updates may be unavailable after 5–7 years.