Weaving Bobbin Winder based on 775 DC Motor

A weaving bobbin winder using a 775 DC Motor (requires external 12V power adapter).

This winder can be used in either horizontal (preferred) or vertical position where space is constrained.

Required Non 3D Printed Materials

• 1 x 775 Motor (12V 3000 RPM)
• 1 x Pulse Width Modulated (PWM) speed controller (see pictures for example)
• 1 x Push On/Off switch (see pictures for hole dimensions)
• 1 x 12V Power Adapter - 2 Amp output or better
• 1 x Chassis Mount DC Socket (see notes below)
• 1 x 626 Bearing
• 1 x Extension Spring, Full loop
  • ¼" OD, 3-¼" Length, 0.025" Wire diameter
  • 6 mm OD, 80 mm Length, 0.6 mm Wire diameter
• 2 x O-Ring (Spindle, Driven and Non-Driven ends)
  • 11 mm ID, 2.4 mm sectional thickness
  • Same O-ring used for 12 mm / ½" snap-on garden hose fittings
• 2 x M4 x 6 mm (775 mounting bolt)
• 4 x M3 x 12mm (3 for Control box, 1 for Non-Driven End bobbin hub)
• Clamp to hold the winder to a table when in use

NOTE: Most DC power adapters at 2 Amp or higher use a 5.5 mm circular plug. The inner pin size could be 2.1 mm or 2.5 mm. Please make sure that the “Chassis Mount DC Socket” matches your DC power adapter.

Extension spring length is measured from tip of loop to tip of loop, this is longer than the main spring body.

Background

From practical experience the maximum winding speed for a bobbin winder is approximately 3000 to 4000 RPM. This is limit is a combination of heat of friction while applying tension to the thread and the impact on source spool (if the source spool is hung on a rod the vibration from unwinding can cause serious resonance).

Limitations

The “as-supplied” version uses 3D printed pegs for attaching the spring to the 3D print. Due to the constant force the 3D printed pegs tend to snap under force. Will provide an updated model that uses M3 bolts as an alternative. (Dec 2025)