When sourcing a fur sewing machine (often called a cup seeder or overlock fur machine), you must prioritize the needle type (typically 459R or DBx1) and the stitch width, which usually ranges from 1.5mm to 5.0mm. Ensure the machine features an automatic lubrication system to prevent overheating during high-speed operation (up to 2,500 - 3,000 RPM). For heavy-duty materials like sheepskin, verify that the motor is a High-Torque Servo Motor rather than a traditional clutch motor to ensure precision and energy efficiency.