Why doesn’t my Screen display show how much bobbin is left?

Posted by on September 13, 2012

In simple terms, there are too many variables that are required to get the calculation of how many wraps it takes to fill the bobbin.  There are several different threads that are available for long arm machines.  There is Bottom Line, So Fine, Specialty, Nylon, Metallic, 100 percent Cotton, Poly Wrapped Poly, Poly Wrapped Cotton, the list goes on and on.  These threads vary in different thicknesses and weights, such as 25, 30, 40 and so on.  There is no way of measuring how many yards of that thread is wound onto the bobbin in order to enter that yardage into the system in order to keep track of the amount that has been expended off the bobbin during the quilting period.  For example, a thin thread will wrap more yardage compared to a thick thread on the bobbin.  Tension also adds a factor, a loose wound bobbin compared to a tighter wound bobbin will change the yardage.

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2 Comments »

  1. Pam says:

    Everything you say is true. But it would still be nice to know when the machine it down to 10% more or less (depending on the thread type) it will help take notice to decide to try and chance it to finish a row or go ahead and change that bobbin. Bernina uses a bobbin sensor. It’s not a 100% accurate for the same reasons but it still is a great guide

  2. This is why I use the open side bobbins instead of the closed side. I buy M size bobbins on ebay from either NGOSew or SharpSewing, excellent prices and the chrome color bobbins work great with our machines.

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