I think its the bobbin. We have been sewing the same material, same needle, thread, etc. for two weeks now. We filled the bobbin, started the sew and we started having the problem? When I first set up the machine I had the same problem and worked it out by loosening the primary tension. The boobin tension is perfect, then the thread binds on the bobbin? Could we be filling the bobbin wrong? or are we loading the bobbin the wrong way? (Bobbin should run Counter clockwise is that over or under the bobbin?)
Thanks sooo much for your time guys! learning something new is always a challenge! But, one I love!
Best,
Dave and Jackie
DJP Handmade