When evaluating a wire embedding machine, focus on ultrasonic frequency stability (typically 60kHz or 70kHz), as this determines the precision of the wire placement in the substrate. You should also verify the embedding speed (e.g., 2000-3000 points per hour) and the number of embedding heads (single, 8-head, or 16-head configurations) to ensure it meets your production capacity. Additionally, check for servo motor precision and the machine's compatibility with different wire diameters, usually ranging from 0.03mm to 0.15mm.