SL Filament Winder

Large-Scale Winding


The SL model is a standardized filament winder with all the benefits of our standard product line: optimized price, reduced lead time and trusted reliability. The machine may be customized and automated to any level of customer needs.


The SL filament winder is designed specifically for larger format parts. Handling parts weighing up to 20,000 lbs, 80 inches in diameter and of any length, this machine is capable of winding any large tank or tube.

Model Number


Max Mandrel Diameter

Up to 80 inches

Horizontal Carriage Stroke

Up to 475

Radial Carriage Stroke

40 inches

Maximum Mandrel Weight (Per spindle)

Up to 20,000 lbs

Mandrel Support

Chuck and Live Center

Number of Spindles


Number of Axes

Up to 6

Spindle Speed

60 RPM

Horizontal Carriage Speed

60 inches/sec

Radial Carriage Speed

40 inches/sec (3rd axis)

Rotating Eye Diameter

10 inches (4th axis)

Rotating Eye Speed

540 degrees/sec (4th axis)

Fiber System

Wet Winding or Towpreg

Maximum Fiber Tension (Total)

250 lbf

Machine Size (Basic Machine Only) (L x W x H)

260 X 144 X 54 inches

Electrical Power

480 VAC, 3 Phase

Pneumatic Power


Control System


Available Winder Options
  • Increased Carriage Stroke
  • Increased Spindle Speed
  • Pneumatic Tailstock Quill(s)
  • Siemens Control System
  • 120 VAC Power Outlet
  • 5th Axis (Yaw)
Available Accessories
  • Servo Tensioning (ST2) Creels
  • Computer Aided Tensioning (CAT) Creels
  • Bookshelf Creels
  • Wet Winding Drum Resin Baths
  • Wet Winding Dip Resin Baths
  • Delivery Systems
    (Towpreg & Wet Winding)
  • Towpreg Delivery Heads
  • Wet Winding Delivery Heads
  • Tape Tensioners
  • Safety Fences
  • Safety Light Curtains
  • Safety Control Systems
  • Auto Tie-on/Cut-off Systems
  • Tailstock Chucks

All Filament Winders are compatible with standalone fiber tensioning and resin systems


Servo Tensioning (ST2) Creels

An innovative and compact tensioning creel developed for high-speed and accuracy. The configuration of the guide rollers reduces stringer wrap-ups and fuzz. The standard ST2 can hold up to sixteen 9-inch diameter bobbins in an 82”x72”x40” footprint. The system can be customized and is compatible with towpreg and wet winding systems.

Computer Aided Tensioning (CAT) Creels

ETC’s CAT Creel tensioner uses sophisticated computer logic to accurately control fiber tension during winding. Each creel plugs directly into ETC’s filament winder control to adjust tension on the fly if needed. CAT Creels accepts standard 9” Diameter X 11” spools and are available with rewind for complex parts.

Bookshelf Creels

ETC’s simplest creel matches with any center-pull fiber spool for easy setup and reliable winding. Adjustable S-wrap tension bars provide a quick means of tension control. Each creel can accommodate 15 spools of fiber and payoff from the front or side of the shelf. Shelves can also be positioned to allow 30 tows to exit from a single exit eyelet plate.

Wet Winding Drum Resin Baths

A precisely adjustable doctor blade provides accurate resin content. Ideal for aerospace and high pressure applications. A 6.5” wide drum can handle up to 24 tows and a 5 liter resin pan provides resin for medium scale parts.

Wet Winding Dip Resin Baths

Provide resin for up to 60 tows with ETC’s Dip Resin Bath. Adjustable drag bars and squeegees provide resin content control. Ideal for applications requiring wide fiber bands or operations that use center-pull spools.

Delivery Systems (Towpreg & Wet Winding)

Modern filament winding is all about delivering fiber where it’s needed. ETC’s delivery systems delivers fiber from the tensioner to the delivery head, minimizing contact points and maximizing control. Each delivery system is customized for facility layout, fiber type and number of tows.

Towpreg Delivery Heads

ETC’s towpreg delivery head provides the same level of control as the wet winding head but with all rolling contacts to work with today’s advanced towpreg fiber systems. Each head is configured for a specific tow width and number of tows.

Wet Winding Delivery Heads

ETC’s wet winding delivery head allows precision fiber control as it is placed onto the mandrel. The standard configuration provides flat bars, a comb and a D-ring to adjust the fiber band width and thickness. Custom D-ring radii, pin count, pin spacing and additional fiber band adjusting options are available to meet customer’s needs.

Tape Tensioners

Give any ETC filament winding machine the ability to place shrink tape, veil or other spooled materials onto your mandrel. Tapes up to 3” wide can be placed with the same accuracy as fiber and with tensions up to 20 lbf.

Safety Fences

Acts a physical barrier around a workcell to keep operators safe from moving machinery. Safety fences can include interlocked doors for workcell access and be combined with Light Curtains and Foot Controls for customized safety needs.

Safety Light Curtains

Light curtains provide additional operator safety to any ETC winding machine. Each system is customized to protect hands, limbs or bodies from touching moving components inside the work cell. The machinery will stop immediately when a beam is broken, ensuring a safe work environment.

Safety Control Systems

Allow operators to maintain hand contact with the mandrels for tie-on/cut-off or placing local reinforcement while still being able to rotate the mandrel (forward and reverse) or stop it immediately as needed with foot operation.

Auto Tie-on/Cut-off Systems

For the highest production facilities the time it takes to tie-on and cut-off fiber before and after winding can significantly add to the total process time. ETC’s auto tie-on/cut-off system takes the place of an operator to perform these operations and increase throughput. Available for wet winding and towpreg systems.

Tailstock Chucks

Solidly support mandrels with the addition of a tailstock chuck. Ideal for unbalanced mandrels or delicate mandrels that may not withstand the axial force of a live center. The chuck is mounted to a standard Morse Taper and can be swapped with the tailstock live center for mandrel supporting flexibility.


Fanuc CNC Systems Integration

As an Authorized FANUC CNC Systems Integrator ETC brings all work cell devices into a single CNC controller for a robust, easy-to-use system.    

Fanuc Robot Systems Integration

As an Authorized FANUC Robot Systems Integrator Engineering Technology Corporation is also capable of using the latest robotics.