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Brother # 8072 bobbin thread won't engage. was working until I refilled bobbin than top thread sews but bottom thread does not catch.Machine makes clickity- clack noise.
Lift the lever on the back of the bobbin case and hold it open as you insert the case into the shuttle; arm on the case pointing up. You may have to turn a bit to the left or right - it will click when in place.
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try changing the needle try a different bobbin try turning the bobbin the opposite direction make sure the bobbin is inserted correctly into the bobbin case there could be something wrong with the hook and hook race and the machine may need some adjustment
Your sewing machine tension
controls the rate at which the thread is fed through either the upper
section of your machine or through the bobbin case. If your upper or
bobbin threads aren't threading properly, sometimes adjusting the
tension will correct this problem.
Timing
Your sewing machine works by
passing the upper thread through the needle of the sewing machine at
precisely the same time the bobbin brings its thread to its uppermost
position. If either the needle or the bobbin thread reach these
positions too soon or too late, the threads won't interact and create
the knots that make the seam. You can throw off your timing by sewing
too many layers of fabric or hitting a pin with your needle. See you
sewing machine repair facility to correct any timing issues.
Thread
Thread can get snagged or caught
in the upper section of your machine or on lint pieces in the lower
bobbin section. If your threads aren't catching properly, you may be
able to fix it by unthreading and rethreading both your upper thread and
bobbin threads.
Check the bobbin tension and that the thread is tight around the bobbin. Make sure that the bobbin is in the right way around - the bobbin thread should double back on itself coming out of the bobbin holder.
It sounds like you are not threading the machine properly. The best way is to make sure the presser foot is in the up position. This keeps the tension disc open and the thread slides into the tension easier. Also make sure you have the bobbin in and threaded correctly into the bobbin case.
You may have the bobbin case in wrong. I have this machine, and I know that it is really easy to put the bobbin case in wrong. Try taking it out and making sure that the little stop is in the front and it is seated down in there and able to wiggle back and forth. My experience with this machine, until the other day when my cat knocked mine off the table and knocked something out of alignment, is that it just works. Any time mine hasn't worked, it has either been dirty, needing oil, threaded wrong or the bobbin case wasn't seated right. In other words, it has always been my fault.
Had same problem with another Machine...I also have a cs 8072. it jumped time. any sewing machine shop can fix it in unser an hour for around $20-$30. Good Luck!!
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