| 1 | Compare the complete machine price | Separate the machine price from needles, cylinders, controllers, compressors, installation, training, spare parts, taxes, and freight. | Use a landed-cost worksheet in one currency, normally USD or EUR, and record whether each quotation is EXW, FOB, CIF, or DDP. | A low factory price may exclude essential accessories and commissioning. | Compare total cost per productive year rather than purchase price alone. |
| 2 | Match machine capacity to the product | Check needle count, cylinder diameter, compatible yarn sizes, sock length, pattern capability, and rated output. | Commercial sock machines commonly use interchangeable cylinders or gauges for different sizes and fabric weights. | A machine optimized for fine socks may perform poorly with thick yarn or larger sizes. | Confirm the expected utilization rate, changeover time, reject rate, and operator hours per dozen pairs. |
| 3 | Verify electrical and safety regulations | Confirm voltage, frequency, plug type, grounding, emergency-stop design, guards, documentation, and conformity requirements. | Typical supply systems include 230 V/50 Hz in much of Europe and India, 120 V/60 Hz in the United States and Canada, 230 V/50 Hz in the United Kingdom, and 100 V/50 or 60 Hz in Japan. | Incorrect voltage or missing technical documentation can delay installation and customs clearance. | Budget for a compliant transformer or electrical modification only after an electrician confirms compatibility. |
| 4 | Check import classification and local regulations | Request the proposed HS classification, commercial invoice, packing list, country of origin, serial number, and technical manual. | Import duty and VAT/GST depend on the destination, customs classification, origin, trade agreements, and declared customs value. | A wrong HS code or incomplete invoice can create reclassification, storage, or clearance charges. | Obtain a written classification opinion from the destination customs authority or a licensed customs broker when the shipment value is significant. |
| 5 | Compare shipping terms and delivery time | Identify who pays export handling, ocean or air freight, insurance, destination charges, import clearance, duties, and final delivery. | EXW places most transport responsibility on the buyer; FOB covers delivery to the vessel; CIF includes freight and insurance to the destination port; DDP generally places import-delivery responsibility on the seller where legally permitted. | “Free shipping” may exclude destination port fees, duties, taxes, and customs brokerage. | For heavy machinery, compare door-to-door landed cost and the quoted production lead time, usually separately from transit time. |
| 6 | Evaluate serviceability and spare parts | Check warranty duration, response time, remote support, technician availability, spare-part lead times, and the list of recommended consumables. | Needles, sinkers, cutters, belts, sensors, lubricants, and electronic components can require scheduled replacement depending on workload. | A machine may become idle if a low-cost replacement part must be imported individually. | Price a 12–24 month starter spare-parts kit and confirm whether software or controller updates incur recurring fees. |
| 7 | Calculate total cost of ownership | Include energy, labor, maintenance, downtime, rejected products, financing, depreciation, and expected resale value. | A practical comparison uses cost per pair: (annual ownership cost + annual operating cost) ÷ saleable pairs produced. | Higher rated output does not guarantee lower unit cost if utilization, quality, or operator skill is inadequate. | Prefer documented reliability, accessible service, upgradeability, and stable spare-part supply over the lowest initial quotation. |