Best answer: How do you adjust the bobbin tension on a Juki sewing machine?

Why is my bobbin thread bunching underneath?

A: Looping on the underside, or back of the fabric, means the top tension is too loose compared to the bobbin tension, so the bobbin thread is pulling too much top thread underneath. By tightening the top tension, the loops will stop, but the added tension may cause breakage, especially with sensitive threads.

Why is the bottom stitch on my sewing machine loose?

If the machine is threaded wrong, not only does it make the thread breaks easier, but is also more likely to create loose stitches. Check the threading to see if the thread has passed through the entire thread guides, the take-up lever and the eye of the needle. … Check out the details of threading the machine here.

How do I stop my thread from bunching up when sewing?

Hold the thread in both hands with light tension. The thread is positioned in the pretensioner. Also make sure the thread is positioned properly between the tension discs on the top of the machine: If it is not positioned correctly, it will not have any tension, and will be pulled under with the very first stitch.

How do you fix a loose bottom stitch?

Stitches are loose on the top and/or bottom

  1. The upper threading could be threaded incorrectly. …
  2. Check the bobbin. …
  3. Change the needle.
  4. Check the combination of the needle and thread size as well as the fabric you are trying to sew on. …
  5. Using a scrap piece of material sew out your stitch and adjust the thread tension.
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How do you fix a bobbin bird nest?

If your bobbin tension is too loose, extra thread may unwind from the bobbin, which causes a buildup of thread underneath the needle plate. Try tightening the bobbin tension by turning the tension screw on the bobbin case a quarter turn clockwise. The top thread isn’t threaded correctly.