My janome mb4--how do you stop bird nesting on the back side and looping on top!!!

Inky Fingers

• 705 Answers
• Posted on Aug 14, 2007

SOURCE: Birds nest

Check the tension on both the upper and lower threads is similar. It sounds like the thread on the lower spool is under tensioned. On most machines the tension is increased by a small screw on the spool.

SOURCE: janome mb4

Loud chirping noises indicate a need for lubrication or something is rubbing against your carriage.
sewman7

SOURCE: Top tread bird nesting.

When you say top thread nesting, I supose you mean that the thread is messed up at the top of the needle plate.
If so,
1st, either your bobbin thread is completely loose, or the bobbin thread is not held under the bobbin case spring,
or lint has been accumulated under the bobbin case spring.
2nd, the top thread is very tight,

or both.

SOURCE: bernina 180 thread breaking and tension problems

First make sure that you are using a new needle in the proper size. A needle with burrs on it will cause the bird's nest problem. Also, is the thread you are using old? My repair guy told me to keep my filled bobbins in the freezer to maintain their humidity, and that has made a world of difference in my stitching. Finally, how long has it been since you had the machine cleaned and serviced, and was it by an authorized Bernina repair shop? Bernina machines have special screws that only Bernina authorized repair people have - I discovered that when I took my machine in to someone who was not authorized only to have the timing go off in a matter of weeks. The authorized repair guy found clumps of thread that had been air blasted into the inner works of the machine and those clumps were getting caught up in the new stitching and causing the same problems you described. Good luck!

SOURCE: Bobbin problems

Are you using a size "A" (Class 15) bobbin? If you are using pre-wounds and they are not this size... they will jump around alot. The size of an "L" is very similar, but they are not as tall (height off the table when laying flat on the round side... like when sitting in the bobbin case.) There are tricks to using the thinner bobbins... See if you have a "taller" size "A"/Class 15 and if that corrects the trouble. [email protected]