bobbin tension spring on juki 441 (recap)

[esantoro]

I can't go back and reproduce my series of questions that helped me troubleshoot the problems I was having with setting consistent, predictable, and reliable bobbin tensions, but I can repost the end results from all the help I received.

For a while I was tightening and loosening bobbin tension only by the tension screw on the bobbin case. The result was that I could tighten bobbin tension pretty consistently but was having problems loosening bobbin tension. The reason was that to loosen bobbin tension appropriately I had to loosen the tension screw so much that the tension clip would be loose enough to wiggle around. sometimes the bobbin thread would even slip free if the forked tip of the tension clip. Also, the tension screw was backed out so much that the top thread would catch underneath the tension clip tongue that screws down, seriously freezing the machine.

The fix:

It was simple, very simple.

I had been adjusting only the tension clip tongue that screws down. Instead I should have been ever so lightly bending the forked tip of the tension clip.

Problem solved. Thanks all for the help.

ed

[esantoro]

Does it seem correct that not all bobbins will spin with the same amount of friction? This seems to be a new variable in bobbin tensioning that has cropped up recently .

Ed

[esantoro]

Does it seem correct that not all bobbins will spin with the same amount of friction? This seems to be a new variable in bobbin tensioning that has cropped up recently .

Ed

Has anyone with the 441 or Adler cylinder arms experienced different results with various bobbins. I think some of my bobbins don't spin properly and give inconsistent bobbin tensions.

I've started using the smaller circumference Baby Bull bobbins with good results. Even if these bobbins have defects, they are small enough to allow for such margin of error.

I'll pay closer attention to the results to be sure of the effectiveness.

ed