Identifying and Fixing Bobbin Tension Issues
Identifying and fixing bobbin tension issues is crucial for achieving high-quality stitches. Here's a step-by-step guide to help you:
Identifying Bobbin Tension Issues
- Check Stitch Quality
Loose bobbin thread: The bobbin thread is visible on the top of the fabric.
Tight bobbin thread: The top thread is visible on the underside of the fabric or puckers occur.
Uneven stitches: The tension balance between the top and bobbin threads is off.
- Perform a Drop Test
Remove the bobbin and bobbin case from the machine.
Hold the thread and let the bobbin case dangle.
A properly tensioned bobbin should allow the case to drop slightly when jiggled. If it falls too quickly, tension is too loose. If it doesn’t move, tension is too tight.
- Inspect the Bobbin Thread Path
Ensure the bobbin is inserted correctly and the thread is feeding smoothly through the tension spring.
- Check for Damage or Dirt
Look for lint, thread fragments, or damage in the bobbin case or tension spring, which can affect thread flow.
Fixing Bobbin Tension
- Adjust the Bobbin Case Screw
Locate the small screw on the bobbin case tension spring.
To tighten: Turn the screw clockwise in small increments.
To loosen: Turn the screw counterclockwise in small increments.
Make small adjustments and test the tension each time.
- Clean the Bobbin Area
Remove lint and debris using a small brush or compressed air.
Ensure the bobbin case and thread path are clean and free of obstructions.
- Use Quality Thread
Inferior thread can cause inconsistent tension. Use high-quality thread compatible with your machine.
- Match Bobbin and Thread
Use the correct size and type of bobbin for your sewing machine.
Ensure the bobbin thread is evenly wound and matches the top thread weight when possible.
- Testing the Fix
Thread your machine and sew a test seam on a scrap of fabric.
Inspect the stitches for balance (no loops or visible threads on the wrong side).
Adjust either bobbin or top tension slightly as needed until the stitch is perfect.
Mykhailo Konet, owner Konsew LTD
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