How to choose a profile bending machine

SMT editorial guide · 3 min read

Start with the section, not a tonnage label

Send the complete cross-section with dimensions, including internal chambers, flanges and any thermal-break strip. A photograph helps show the profile, but dimensions are needed to assess the job. Identify material grade, temper and wall thickness. These details help the engineer evaluate both the force requirement and how the section will be supported.

Define the finished shape

Specify whether the radius is measured on the inside, outside or centerline. Include arc angle, finished length, straight ends and bending orientation. For a spatial curve, provide a 3D model or multiple views showing section orientation along the path. A planar arc and a 3D curve can require different configurations even with the same section.

Describe what a good part looks like

State dimensional tolerances, allowable twist and visible-surface requirements. Include assembly details if the bent profile must mate with glazing, seals or another section. Machine-axis accuracy does not establish finished-part results. Agree how and when the unloaded part will be measured.

Compare the full configuration

Ask what the quotation includes: roller tooling, supports, controls, electrical supply, packing and commissioning. Review workshop space and handling of long profiles. More force alone cannot correct inadequate support. Where suitability is uncertain, a trial with your actual profile is a useful basis for selection.

Prepare the first enquiry

Send the drawing, material specification, target shape and quantity together. Add photos of existing bending problems. SMT can review the job, recommend a configuration and agree whether free test bending is the next step.