3D-printed conversion kit to automate your hand-crank Chinese cobbler sewing machine
Fits a wheel 174 mm wide — very snug fit. Measure and confirm your wheel width before ordering.
Kit includes 3D-printed mounting parts, pulleys, and belts required for installation.
Servo motor not included — you must purchase a compatible external servo separately.
Printed installation instructions included in the package.
Important notes
Confirm your machine’s flywheel/wheel width is 174 mm. The kit is designed for a tight fit; incorrect wheel dimensions will prevent proper installation.
Confirm you have space and a mounting point to attach an external servo to your machine.
If you need guidance selecting a servo: choose a motor capable of low-speed operation (around 200 rpm) with sufficient torque for driving your machine under load. We do not supply the servo — select one rated for continuous duty at the required speed and torque. I run this one on my machine. Also note that it should have a separate foot controller. Sewing Machine Servo Motor for Industrial Sewing Machine Power 3/5HP 450W, Brushless Reversible Motor with Controller and Foot Switch (450, Watts)
What’s in the box
3D-printed mounting bracket(s) and adapter pieces sized for a 174 mm wheel
Drive pulley(s) sized to match the kit
Drive belt(s) matched to pulleys
Fasteners and small hardware for assembly
Printed step-by-step installation instructions
Recommended checks before ordering
Measure wheel width at its widest point; it must be 174 mm.
Verify clearance around the wheel for the bracket and pulley.
Determine a suitable servo location and confirm you can route the belt without interference.
Estimate required torque (depends on leather thickness and stitch rate) and choose a servo accordingly.
Support
Printed instructions included.
3D-printed conversion kit to automate your hand-crank Chinese cobbler sewing machine
Fits a wheel 174 mm wide — very snug fit. Measure and confirm your wheel width before ordering.
Kit includes 3D-printed mounting parts, pulleys, and belts required for installation.
Servo motor not included — you must purchase a compatible external servo separately.
Printed installation instructions included in the package.
Important notes
Confirm your machine’s flywheel/wheel width is 174 mm. The kit is designed for a tight fit; incorrect wheel dimensions will prevent proper installation.
Confirm you have space and a mounting point to attach an external servo to your machine.
If you need guidance selecting a servo: choose a motor capable of low-speed operation (around 200 rpm) with sufficient torque for driving your machine under load. We do not supply the servo — select one rated for continuous duty at the required speed and torque. I run this one on my machine. Also note that it should have a separate foot controller. Sewing Machine Servo Motor for Industrial Sewing Machine Power 3/5HP 450W, Brushless Reversible Motor with Controller and Foot Switch (450, Watts)
What’s in the box
3D-printed mounting bracket(s) and adapter pieces sized for a 174 mm wheel
Drive pulley(s) sized to match the kit
Drive belt(s) matched to pulleys
Fasteners and small hardware for assembly
Printed step-by-step installation instructions
Recommended checks before ordering
Measure wheel width at its widest point; it must be 174 mm.
Verify clearance around the wheel for the bracket and pulley.
Determine a suitable servo location and confirm you can route the belt without interference.
Estimate required torque (depends on leather thickness and stitch rate) and choose a servo accordingly.
Support
Printed instructions included.
