How do I correct excessive thread breaks/frays on one needle?
There are many may causes of thread breaks and frays. The following is a list of possible causes and fixes: Poorly punched designs. To verify if the problem is being caused by an improperly punched design, sew with a known good design. Needle not installed correctly. Ensure that the needle is inserted all the way until it meets the end of the needle bar. Set needle so that the notched part comes on the rotary hook side. Needle is bent or dull. Replace needle. Incorrect needle being used for application. Change to correct needle. Tensions not set correctly. Set machine to proper tensions (see setting Upper Thread Tension and Setting Bobbin Tension procedures). Needle is not threaded correctly. Check threading with diagram in instruction manual. Thread is of poor quality or old. Replace with a known good cone of thread. Scratches or burrs in thread path (thread guides, take-up lever, etc.). Polish with crocus cloth of #52c crocus cord if scratches are minor. Replace if scratches are seve
