It could also be the tension of the thread while you are threading the needle through the upper system. Keep a slight tension on that thread while doing it. Otherwise, make sure that the bobbin thread is 'coming' from the right position on the spindle.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
The white bobbin thread was showing on the top of the material correct? Make sure bobbin thread is in the tension correctly, check the top thread spool and make sure thread is not caught around it, if you have a manual top tension make sure that is set correctly. Personally I would never use wd40 in a sewing machine, sewing machine specific oil is always better. You seem to be describing two different problems. The thread bunching is probably from the thread jump out of the take up lever.
try changing the needle make sure the bobbin is turned the correct way in the bobbin case make sure the thread has not come off the thread take up lever clean under the needle plate and in the bobbin area for lint
try changing the needle rethread the machine top and bobbin make sure the bobbin is inserted correctly into the bobbin case and that the bobbin is turned the right way make sure the thread has not come off the thread take up lever if the machine continues to see bunch thread underneath then the machine may need to be checked to see if some part has become damaged or out of alignment
try changing the needle rethread the machine top & bobbin make sure the bobbin is inserted correctly in the bobbin case make sure the top thread is not coming off the thread take up lever make sure the bobbin is wound correctly if these suggestions don't work, I suggest that you take the machine to a sewing machine shop to have it checked
It is probably not the bobbin thread that is "bunching", put different color top (maybe red), and bobbin (maybe white), thread in the machine and sew. If the top thread is messing up on the bottom of the cloth you have 3 possible solutions. Here are the solutions in order of probability: 1 - You have not threaded the UPPER thread correctly. Read your book on threading. 2 - Your UPPER thread tension is too low. Try setting it at 5 or so. 3 - Your shuttle is damaged. Get a new one.
If your bobbin is the correct one for your machine and it is wound tight, not loose and puffy, make sure the thread is going the right way when installed (over the top to the left and then placed flat in the bobbin case). Usually if the thread bunches underneath your fabric it means that the TOP thread is threaded incorrectly. Try re-threading the upper thread. Good luck!