New Cobra Class 18 Tension Issues?

[Wizcrafts]

Well it is still pulling the bottom thread up for about 8-10 stitches then back to normal. when it stitches like normal it looks great though.

Something happens during those stitches to cause the tension to go awry. The problem is either in the bobbin/bobbin thread, or the top thread and its path. Watch the top thread as you sew a long strap. You may see it twist around a post, or even itself.

Make sure that the bobbin thread feeds under the bobbin spring and stays under it. Load the bobbin so it feeds counterclockwise into the slot in the bobbin basket. Check the bobbin to see if the starting thread has a stub sticking out that might be catching on the case, basket, or shuttle.

[Red Cent]

What Wiz said. I found that when that problem happened, the thread "caught" on the spool thread. Any time the thread is impeded, no matter how little, it creates super tension in those discs especially the lower one.

[tnawrot2]

You said you are using a piece of scrap leather, if you are using any belly leather it has different consistencies and firmness that would cause your problem.

[TKLeather33]

You know I am using some pretty bad chap scrap and I was wondering if that was it as well. I put some projects together last night and stitched em this morning and it went well. But I have run a bunch off of the brand new spool, and adjsuted a few tensions as well so maybe we cured it. Thanks for all of the input and help guys