I think it is trial and error with needle/thread combos that your machine likes. I started out with my new to me Brother 1500 Nouvelle and had a lot of problems. I thought it was the machine. then I kept trying different thread and needle sizes, combos, and realized my machine doesn't like to go in a certain direction so I have to remember to go very slowly. Now I can use a lot of different threads with good results. But right now I am fighting a polyester thread that is not Isacord and the first half of the quilt went fine, now it is breaking every few minutes. I'm thinking there is something wrong with the thread but, I started in the middle with an all over design and want it to match. I've cleaned, oiled, changed needle, etc. It isn't a tension issue. The thread shreds at the needle. For no apparent reason. No burrs, good needle, inserted correctly, threaded correctly, etc. So a mystery. I am plodding through.