Yibo Machinery Manual Expandable Core Shaft Flexible Winding Mandrel Transformer Coil

Precision Expandable Core Technology: Delivers perfectly round coil geometries with 0.02mm concentricity, ensuring uniform wire tension and consistent winding quality.

Zero Coil Damage on Stripping: Eliminates deformation or wire breakage during demolding, drastically reducing scrap rates and costly rework.

30% Faster Winding Cycles: Optimized expansion/contraction mechanisms cut setup and stripping time by an average of 30% compared to fixed-diameter mandrels.

One Mandrel for Multiple Coil Sizes: Adapts to coil diameters from 200mm to 800mm, ideal for both prototype workshops and high-volume transformer production lines.

Unmatched Durability in Continuous Operation: 2x longer service life than standard mandrels, with zero jamming failures even in 24/7 industrial environments.

Uniform Wire Tension Control: The expandable design creates a perfectly even winding surface, preventing wire slippage and ensuring consistent layer alignment.

No More Core Replacement Costs: Eliminates the need for purchasing multiple fixed-diameter mandrels, cutting tooling expenses and storage overhead significantly.

99.8% Coil Roundness Consistency: Precision-machined expansion segments deliver a 99.8% roundness rate, reducing transformer core losses by up to 5%.

Seamless Integration with All Major Winding Machines: Compatible with most brands of automatic / semi-automatic transformer winding machines, requiring zero modification for quick setup.

Faster Changeover Than Standard Mandrels: Achieves full diameter adjustment in under 60 seconds, beating competitors multi-step setups by over 70% in time efficiency.