Originally Posted by DogHouseMom
Can't think of anything else.
Sewed 4" blocks together. Ironed them. Came immediately back to machine - sewed another 4" block together and when I lifted it from the machine my fingertips felt the bobbin loops they were so prominent!!
What the heck ....??
turned machine off, waited 10 seconds, turned it back on - still the same.
Adjusted tension from 5 to 6. Still icky. Removed bobbin, cleaned machine, oiled machine, replaced bobbin. Tension back at 5, still icky.
So I started sewing a bunch of "samples" to bring to my dealer and marked them 4, 5, 6, 7 - and all samples were lousy. I then set it to 3 for another lousy sample and the loops were ginormous (> 1/4"!!). Set it back to 5 and sewed another sample and ... it was good. Sewed several more samples and they were good. Set tension to 3 again and the loops were big but not ginormous like last time. Back to 5. Normal.
So did my machine just have indigestion or what?
Machine is Janome 6600.
As a general rule when the problem is on the bottom of the fabric, the solution is in the top thread path. The exception is the drop in bobbin machines, the problem can be on the bottom and it can be the bobbin thread. Did you make sure the bobbin thread is in the little tension slot? Try sewing with two different colors of thread, that way you can tell which one is the problem.