03/29/2025
Quick tips for embroidery.
What causes bird nesting? (see photo)
The main reason bird nesting can occur is when there is an extreme imbalance of tension between the top thread and the bobbin thread. The thread is pulling downward because the top thread is too loose or the bobbin is to tight. In some rare cases the rotary hook could have a burr or scratch on it, and its snagging the thread and pulling it down.
Here is a list of things to check on your machine.
1. If it is only happening on one needle then chances are the thread is not going through the take up lever, or the thread came out of a tension washer. The thread probably feels too loose when you pull on it, compared to the other needles. Check the thread path carefully and re thread if necessary.
2. If the bird nesting is happening on all needles, then your bobbin thread is too tight, or there is a scratch on the rotary hook, or there is dirt or thread caught in the rotary hook. Make sure your bobbin thread pulls out nice and smooth and not too tight. Make sure your rotary hook is oiled. Also make sure your picker (see second photo) is not stuck-in like the photo. The picker is spring loaded and should stay out away from the bobbin. It goes in only when it first starts sewing and when the machine trims the thread.
3. Sometimes if you take a large design and shrink it down without removing some stitches it is extremely tight. The embroidery is so dense that the thread is stuck below the garment and the machine cant pull the thread up to make a stitch. So the thread just loops below the fabric like photo 1.
This is a very frustrating problem to have and every one will eventually run into this. Just keep in mind that it usually happens right after you have a thread break, or change a bobbin, or start using a needle that you haven't used in a while. It could even be that you just changed a needle and put it in backwards.
Hopefully, with a little detective work, you can solve the mystery of the bird nest.
Happy sewing
John Echlin