Remove the top thread from the machine.
ALWAYS RAISE the presser foot and rethread the top.
Be sure that your top thread follows the correct thread path.
Set the top tension to the midway point.
Re-test your machine.
Tension is a tug-of-war between the top and bobbin threads. Correct tension is when both threads meet in the middle of the fabric. If the bobbin thread is laying on the underside of the fabric, the top tension needs to be increased so it will pull the bobbin thread up into the fabric. If the top thread is pulling the bobbin thread up to the top of the fabric, then the top tension needs to be loosened.
TIPS:
FWIW, thread tension is not static. Tension will need to be adjusted probably every time you start a new project. Test it on a piece of scrap fabric from the project and adjust it BEFORE beginning the project. Remember to change the needle often--probably every time a new project is started or every 8 hours of sewing time. Be sure to use the correct type and size needle based on the fabric & thread you are sewing. Also, AVOID old or bargain bin thread!
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Understanding Thread Tension Threads
Sewing Lesson 10 How to Fix Tension on Your Sewing Machine
Learn the Ins and Outs of Troubleshooting Sewing Machine Tension
All About Needles SCHMETZ Needles
SOURCE: Top thread stitches correctly but bottom thread loops.
FYI---- Loops on the bottom-- problem is in the threading..
Loops on the top--- problem is with the bobbin.
SOURCE: our toyota Rs2000 quiltmaster 50 is not picking
1.is the needle bent or blunt
2.is there a 2 to 3 inch tail on the bobbin that it can be picked up
3.is there lint or thread fragments in the bobbin aea
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