The HSI machine concept was developed as a robust solution for workshop operation for bending thick sheets. The symmetrical arrangement of the three rolls enables the bending of one end of the sheet before the actual rounding, without having to turn the tube.

The HSI machines feature a robust hydraulic drive concept in all axes. An optional three-roller drive with an overload clutch is available for the rotary drive. The machine body consists of a stable steel structure that absorbs the bending forces. The rolls are made of highly tempered steel; the roll surface is optionally hardened and ground. The top roll has a fixed bearing on the drive side; on the other side there is a manual hinged bearing, which can optionally be pneumatic.

The linear adjustment has mechanical position indicators. Optionally, these can be replaced by digital displays with programmable software limit switches. The design and manufacture is carried out in accordance with the current CE specifications.