Originally Posted by
tallchick
I only wind 2 bobbins at a time, when I have to wind more bobbins that is my sign to change my needle and clean out my bobbin area. Yes I can wind more bobbins, but this is what works for me to ensure that I clean my machine and change the needle on a regular basis.
That does sound like a great way to keep track.
I change mine when I think of it or when I hear it starting to sound thunkish.