| Pipe Outside Diameter Capacity | 15% | Choose a machine whose rated maximum diameter is at least 15–20% above the largest pipe used in production. | A small capacity margin reduces overload risk and allows for future product changes. | Compare the manufacturer’s capacity chart with actual pipe outside diameter, not nominal pipe size. | 1–5 |
| Wall Thickness and Material Strength | 12% | Confirm rated wall thickness for carbon steel, galvanized steel, stainless steel, or other materials used. | The same diameter may require substantially different bending force depending on wall thickness and yield strength. | Request test bends using the actual material grade, diameter, and wall thickness. | 1–5 |
| Minimum Centerline Bend Radius | 10% | For general pipe work, compare the required centerline radius with the tooling range; many applications require approximately 1.5D–3D or more. | A suitable radius helps prevent flattening, wrinkling, cracking, and excessive wall thinning. | Measure the finished bend and inspect the inside, outside, and neutral axes for deformation. | 1–5 |
| Bend Angle Accuracy | 10% | For repeat production, target a demonstrated accuracy of approximately ±0.5° to ±1.0°, depending on material and process. | Higher accuracy reduces rework, fitting adjustments, and assembly variation. | Run at least 10 consecutive bends and record actual angles with a calibrated measuring tool. | 1–5 |
| Repeatability | 10% | For automated production, look for repeatability near ±0.5° where the application requires consistent multi-part output. | Repeatability is often more important than one-time peak accuracy. | Evaluate a batch of identical parts after machine warm-up and compare the full measurement distribution. | 1–5 |
| Production Speed | 8% | Compare complete cycle time, including loading, clamping, bending, unloading, and tooling changes—not only the bending stroke. | A fast hydraulic stroke may not produce high output if setup and handling are slow. | Time a representative batch and calculate finished parts per hour. | 1–5 |
| Safety Systems | 12% | Prioritize emergency stops, guarded pinch points, interlocked access panels, overload protection, and clearly defined safe operating zones. | Pipe benders contain high mechanical and hydraulic forces that can cause severe crush injuries. | Request a documented risk assessment, safety circuit description, operator manual, and on-site safety demonstration. | 1–5 |
| Tooling Flexibility | 8% | Check compatibility with multiple diameters, radii, clamps, pressure dies, wiper dies, mandrels, and forming tools. | Flexible tooling extends the useful life of the machine and supports more product types. | Obtain a complete tooling price list and confirm availability of replacement components. | 1–5 |
| Purchase Cost | 7% | Indicative planning ranges: manual units often below USD 5,000; standard hydraulic units commonly about USD 8,000–40,000; CNC systems may range from approximately USD 30,000 to above USD 150,000. | The lowest purchase price may not provide the lowest cost per finished part. | Compare equivalent specifications, tooling, installation, training, shipping, taxes, and commissioning. | 1–5 |
| Total Cost of Ownership | 10% | Include energy, hydraulic oil, preventive maintenance, tooling, operator labor, downtime, scrap, and expected service costs over 5–10 years. | Operating and downtime costs can exceed the initial purchase price over the machine’s service life. | Calculate cost per acceptable part using realistic annual production volume and reject rates. | 1–5 |
| Energy Consumption | 3% | Compare motor power, idle consumption, duty cycle, and actual energy use per finished part. | Efficient systems can reduce operating costs, especially in high-volume production. | Use measured kWh per hour or kWh per part under normal production conditions. | 1–5 |
| Maintenance and Serviceability | 8% | Prefer accessible lubrication points, standard wear parts, clear maintenance intervals, fault diagnostics, and documented procedures. | Simple maintenance reduces unplanned downtime and extends equipment life. | Review the preventive-maintenance schedule and request lead times for critical spare parts. | 1–5 |
| Control and Data Features | 3% | For repeat production, consider recipe storage, password levels, diagnostics, production counters, and data export. | Digital records improve setup consistency, traceability, and operator control. | Test the user interface with a real production program and verify backup and recovery procedures. | 1–5 |
| Installation Requirements | 2% | Confirm floor loading, footprint, electrical supply, compressed air, ventilation, lifting access, and operator clearance. | Unexpected site modifications can increase project cost and delay production. | Complete a site survey before placing the order. | 1–5 |