Sounds as though you might just have too much tension on the arms of the bobbin or you are 'choking' the thread as you tie and causing it to break.Originally Posted by shadesofsisyphus
Correct bobbin tension cannot be achieved 'out of the box', you have to fine tune your bobbins to give just enough resistance to gravity and pull as you tie. Pulling too hard on any thread will cause it to break, it is just a matter of getting the 'feel' for the thread in use. Saying that, I still break the damned stuff at crucial moments from time to time!
Have a look at the link below for some tuning tips.
TLs
Tuning Bobbins
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