bylinesupplyco Report post Posted February 10, 2015 I just purchased my first industrial machine today (Pfaff 145 with brand new Servo motor) from an awesome industrial machine tech in Vancouver, WA. He gave me a demo on the machine using 207 top thread and 138 bottom thread. He showed me how to thread the bobbin, insert the bobbin, how to thread the top thread, etc. When he did the demo through 3 pieces of 3-4 oz. veg it sewed like butter and both the top thread and the bottom side looked amazing. Once I took it home and set it up in my shop, I retreaded the bobbin with my desired color, and threaded everything correctly from what I can see. When I go to sew, the top thread looks great, but the bottom thread looks horrible. Either it has big loops, which I seemed to eliminate by pulling on the thread behind the presser foot to start, or the bottom thread looks like a straight line with little bumps where the top thread loops around it. Any help would be appreciated as to what I'm doing wrong and how both stitches can be even Quote Share this post Link to post Share on other sites
Oakley Report post Posted February 10, 2015 That sounds for me like the upper thread tension is too loose or the threading is wrong. In Youtube you can see a few Pfaff threading videos, if you want to make sure it's correct. The first thing I would try would be to increase the upper thread tension, probably that solves the problem quite fast. Quote Share this post Link to post Share on other sites
