Thread breaking and shredding?
These charts will help you when you are having a problem with threads breaking and shredding.
Download the charts and follow the sections through to find (and fix) your thread problems.
Download the Thread Selection Guide (PDF) of which thread is best for which job. (Right-click and choose Save as.)
Here’s a useful Reference Guide Home Machines (PDF) of recommendations for Julie’s Superior Threads products, showing needle size, thread description and recommended bobbin size.