Every sewer and embroiderer knows the heartache of broken threads. You are sewing along and everything is going great. Then snap. The thread breaks and you cannot sew another inch.
Even technicians struggle with breaking threads sometimes. It does not seem to matter how much experience a person has. Sometimes threads break.
BERNINA 830
It does not matter whether the sewing machine cost or ,000. Under certain conditions threads do break. The machine may be a Brother VX or a Bernina 830. It may be a home sewing machine, a quilting machine, embroidery machine, a serger, or an embroidery machine.
How do you stop threads from breaking? What causes the problem?
Pull too hard on any thread, and it will break. Pinch or cut the thread, and the thread will break.
When threads are under excessive pressure, they literally pull apart. This can happen when the thread gets caught on something and the machine keeps trying to stitch anyway. It can happen when the tensions are set too tight, the hook grabs the thread without releasing it, or when the thread snags on some part of the thread line. I recently started to sew and the thread wrapped around the thread spool and snapped seconds after pressing the foot pedal.
Threads may be pinched or even cut by rough spots, burrs, or other sharp parts of the sewing machine. Needles often develop burrs which can easily clip the thread cutting it. Sharp edges on the carrier, hook, guides, or anywhere can cut the thread.
Now that we understand the typical conditions under which thread breakage occurs; we can begin the diagnostic process of identifying the specific cause of thread breakage and seek appropriate solutions to the problem. Once solved, the threads should flow smoothly through the sewing machine forming stitches with good quality.
Here are some things for you to double check.
To begin with, take out the old needle and put a new one in its place. Be sure to match the needle to the fabric for best performance.
The second place to look is from the thread spool across the top of the machine, through the thread guides, around the tension disc, through the tension spring, over the take up lever, and down to the eye of the needle. Look for any surface blemish that might snag or pinch the thread. It may snag at the spool or anywhere along the thread line. Also be sure to use good quality thread. Poor quality threads break more easily.
Next, check the needle plate for abrasions, sharp edges, and needle pricks. Smooth or fix the needle plate or replace it.
Fourth, inspect the bobbin for sharp edges, improper thread wrappings, and proper selection. Never wind more than one thread on a bobbin. Loose ends can interfere and cause thread breakage. Often we find that the user is trying to use the wrong bobbin for the machine. It is essential that the bobbin match the make and model of the machine.
A damaged bobbin carrier can cause all manner of problems. Look for breaks, cracks, thread scores, sharp edges, and any other potential problem.
The sewing machine hook is a crucial part for stitch formation. If it becomes damaged with needle pricks, burrs, or surface damage; it can cause thread breakage.
The sewing machine hook moves along a groove known as a race. This race often becomes damaged by neglect, needle scoring, and debris. The race must be clean and lubricated with pure clean sewing machine oil. Flaws must be removed or repaired.
The eighth step is to rethread the machine and adjust the tensions properly. The bobbin tension must be set first, and the upper tension set to balance the lower tension. Be sure to clean out the tensions and make sure they are operating properly.
Check the hook needle timing and clearance. They must operate properly and be correctly adjusted in order for the stitching to operate properly and prevent thread breakage.
Feed dogs may pull the fabric and thread in problematic ways unless properly set for timing, movement, and feed dog height.
Careful inspection, problem solving, and trial and error may be necessary to fine tune the sewing machine operations to prevent thread breakage.
Putting an End to Sewing Thread Breakage
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BERNINA 830
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