A 3-thread machine has an upper looper, lower looper and a single needle thread.
Visit https://www. craftsy. com/blog/2012/10/what-does-this-serger-stitch-do/ for more information or if you don’t have a manual.
If the stitches are loose, adjust the tension dials next to each spool of thread on the overlock sewing machine to make the thread tighter. If the fabric is puckered or bunched up, loosen the tension on the serger.
Always do a practice stitch whenever you change your needle, thread, or any other part of the machine. That way, you can make sure that everything is in place and working properly.
