bobbin thread binding

[chapelstone]

I have a cobra 26 that the bobbin thread is not feeding out correctly. The bobbin is installed correctly, the bobbin basket is moving freely but when I put the tab down over the top of the bobbin it starts to bind up. Been using it for a year and never happened before.

[friquant]

Sounds frustrating. Here are some things to try:

1. Does the machine turn over freely when bobbin and bobbin case cap are removed? (Can turn handwheel a couple revolutions to check no binding)
2. With bobbin case cap in your hand, and the bobbin loaded into it, does pulling on the thread show smooth, even tension?
3. With bobbin case and bobbin installed in machine, but no fabric under presser foot, does pulling on the bobbin thread show smooth, even tension?

[Wizcrafts]

1 hour ago, chapelstone said:

I have a cobra 26 that the bobbin thread is not feeding out correctly. The bobbin is installed correctly, the bobbin basket is moving freely but when I put the tab down over the top of the bobbin it starts to bind up. Been using it for a year and never happened before.

That machine sounds like the bobbin drops in vertically and a securing latch snaps down on top of the bobbin. If that bobbin thread slides out of the edge of the bobbin, it wil either wind around under over over the bobbin and wrap around the post or the snap down retainer. Maybe this bobbin thread is wound too loosle and is unwinding outside the edges of that particular bobbin. Try winding another bobbin and see if it has closer toerances inside the basket. Also, feed the  bobbin thread against the rotation of the shuttle.