STEFA Roll Former: 100 mm Minimum Length

The STEFA line’s published 100 mm minimum length is a starting specification, not proof that every profile will meet that length at the required cut quality.

The STEFA ROLL FORMER LINE is designed to cold-form four roofing profiles from pre-painted galvanized steel. Its specified material thickness is 0.3–0.5 mm, with tensile strength of 220–350 MPa. The line combines a decoiler, forming equipment, fixed hydraulic shears with profiled blades, encoder positioning, and a 6 m discharge table with pneumatic unloading.

Read the minimum-length figure narrowly

The machine’s published minimum length is 100 mm, while its stated cutting tolerance is ±0.5 mm on 6,000 mm. Those are not interchangeable claims: the 6,000 mm tolerance does not establish the tolerance at 100 mm, and neither figure by itself proves that every one of the four profiles will produce an acceptable short part.

For a purchase decision involving short repeat pieces, ask how the minimum applies to the proposed profile, material, and shear setup. Confirm the length datum, required tolerance at the target length, acceptable cut-end condition, and the method for checking repeat pieces. Treat the answer as a configuration-specific point to verify, not an assumption based on the headline minimum.

Run the shortest part on the actual profile

Bring the drawing for the shortest part you expect to run, the relevant profile drawing, and the coil specification. Test the proposed thickness, coating, and material range rather than relying on a demonstration with a different profile or stock. Measure repeated parts against the required length and cut-quality criteria; also inspect the panel itself for buckling or other distortion.

Cutoff setup matters to the forming process: drag or mistiming can contribute to panel buckling and upstream imperfections. Encoder positioning can support programmed length control, but a position setting is not a substitute for checking the finished part. Agree on measurable acceptance criteria before using a trial to establish whether the minimum length works for production.

Include the short part in the discharge review

The 6 m discharge table and pneumatic unloading form part of the configured line, but the product description does not establish how every short part will be collected or bundled. Include the shortest pieces in the proposed unloading and receiving review, especially where they require a particular orientation, protection, or count. The useful decision is whether the tested part can be formed, cut, checked, and moved as the buyer’s process requires.

I’m Jon Williams, a Mac-Tech Sales Executive serving the Western and Central United States, with northern Wisconsin overflow. I can help assess the STEFA line’s minimum-length claim against your profile, material, and cut requirements and prepare a quote configuration. Bring the shortest-part drawing, profile details, coil specifications, required length tolerance, a representative sample if available, and your acceptance criteria so we can assess the fit.