Adjustable
Mandrels
Precision-engineered adjustable mandrels designed for transformer coil winding, insulation cylinder production and custom manufacturing processes requiring accurate diameter control, dimensional stability and long-term operational reliability.
Flexible mandrel systems for transformer manufacturing operations.
Adjustable mandrels play a critical role in transformer coil and insulation component manufacturing by providing a stable and precisely controlled form around which winding and shaping processes are performed.
ISOLECT adjustable mandrels are engineered to support a broad range of transformer production requirements, including distribution transformers, power transformers, insulation cylinders and custom winding applications. Multiple geometries and expansion mechanisms are available to accommodate different production methods and dimensional requirements.
Available in vertical, horizontal, zigzag, oblong, octagonal and cylindrical configurations, these systems offer exceptional durability, repeatable diameter adjustment and reliable long-term operation in demanding manufacturing environments.
Designed for advanced transformer production facilities
Distribution Transformer Manufacturing
Power Transformer Manufacturing
HV Coil Winding
LV Coil Winding
Insulation Cylinder Production
Pressboard Processing Operations
Custom Coil Manufacturing
Electrical Insulation Manufacturing
Reactor Coil Production
Dry Type Transformer Production
Prototype Development
Special Winding Applications
Engineered for dimensional accuracy and production flexibility
Adjustable Diameter Design
Manual and Motorized Operation Options
Vertical and Horizontal Configurations
Heavy-Duty Steel Construction
High Load Capacity Designs
Automatic Diameter Stop Function
Polyamide Pad Options
Reinforcement Wing Integration
Custom Geometry Solutions
Double-Sided Working Capability
Precision Diameter Control
Long Service Life Components
Designed to accommodate a wide range of production requirements
| Diameter Range | 90 mm – 2700 mm |
| Effective Height | Up to 3000 mm |
| Load Capacity | Up to 15,000 kg |
| Mandrel Types | Vertical, Horizontal, Zigzag, Oblong, Octagonal, Cylindrical |
| Operation Mode | Manual or Automatic |
| Drive System | Mechanical or Geared Motor |
| Material Options | Steel Construction / Polyamide Pads |
| Control Options | Manual, Motorized, Safety Limited |
| Customization | Available |
| Application | Transformer Coil & Insulation Manufacturing |
Technical values may vary depending on mandrel geometry, operational requirements and custom engineering options.
A complete range of adjustable mandrel solutions
ISOLECT offers multiple adjustable mandrel designs to meet different transformer manufacturing processes, winding geometries and production requirements.
Vertical Mandrel
The vertical mandrel is designed for transformer insulation cylinder manufacturing and winding applications requiring precise diameter adjustment and excellent structural stability.
The system can also be operated horizontally when required. Mold opening and closing operations are performed through a geared motor system with automatic stopping at final dimensions.
Horizontal Mandrel
Horizontal mandrels provide stable support for winding and insulation production processes where horizontal operation improves accessibility, handling and workflow efficiency.
Equipped with a geared motor driven expansion system, the mandrel automatically stops when the desired diameter is reached, ensuring repeatable production quality and process safety.
Zigzag Mandrel
The zigzag mandrel incorporates a specialized segmented geometry designed to eliminate unwanted expansion gaps during diameter adjustment.
This unique structure provides a more uniform winding surface and helps achieve gap-free production quality for demanding insulation and winding applications.
Oblong Mandrel
Oblong mandrels are designed for applications requiring non-circular winding geometries while maintaining dimensional precision and operational flexibility.
Diameter adjustment is performed through a control panel and protected by safety limit switches. The system can also be configured as a square mandrel using dedicated accessories supplied for specific production requirements.
Octagonal Mandrel
The octagonal mandrel features a double-sided adjustable structure and a highly rigid mechanical framework developed for demanding transformer manufacturing processes.
Diameter adjustment is achieved mechanically through auxiliary arms while locking at maximum and minimum positions is secured using dedicated fastening mechanisms.
Cylinder Mandrel
Cylinder mandrels are specifically engineered for transformer coil winding operations where maintaining consistent diameter and geometrical accuracy is essential throughout the manufacturing process.
Aluminum wing construction and customizable design parameters allow manufacturers to optimize production quality while adapting the mandrel to unique winding requirements and operational preferences.
Reliable adjustment and positioning technologies
Motorized Expansion
Selected mandrel models utilize geared motor systems for controlled opening and closing operations with automatic stopping at final dimensions.
Safety Position Control
Integrated limit protection systems prevent over-expansion and improve operational safety during diameter adjustments.
Mechanical Locking
Robust locking mechanisms ensure dimensional stability and repeatable manufacturing quality throughout production cycles.
Tailored mandrel solutions for specialized production
Every transformer manufacturer has unique production requirements. ISOLECT designs custom adjustable mandrels optimized for specific diameters, winding processes, geometries and load capacities.
Built for productivity and manufacturing precision
Improved Coil Accuracy
Flexible Diameter Adjustment
Consistent Product Geometry
Reduced Manufacturing Errors
Higher Production Efficiency
Long Service Life
Enhanced Operator Safety
Lower Operating Costs
Explore Other Production Support Solutions
Need a custom adjustable mandrel solution?
Our engineering team can configure the ideal adjustable mandrel system for transformer coil manufacturing, insulation cylinder production and specialized winding applications.