Sewing Machine: Bobbin thread breaks
A dirty shuttle race, improper thread routing or incorrect thread tension can break the bobbin thread.
Unplug the sewing machine and check thread routing according to guidelines in your owner's manual. Reroute the thread correctly if necessary.
Also, check thread tension settings because incorrect thread tension can break the bobbin thread. Set thread tension according to the guidelines in your owner's manual.
Clean the shuttle race because lint and debris buildup can bind up the bobbin and break the bobbin thread.
Clean the sewing machine
Clean lint and debris from the shuttle race every 3 months because it often attracts lint and dust. Clean the feed dogs at the same time because they also attract lint and dust. Clean those areas more often when using the sewing machine regularly. Oil the sewing machine after cleaning.
Adjust the sewing machine thread tension
Tight upper thread tension causes skipped stitches. Reduce the upper thread tension when the sewing machine skips stitches. Adjust lower thread tension as necessary to balance with the upper thread tension to create perfect stitches.
If the drive motor on your sewing machine runs roughly or doesn't run at all, you can replace it in about 30 minutes using these simple steps.
If the sewing machine is completely dead, replace the On/Off switch using these 6 steps.
Learn how to use a multimeter to check for wiring problems in an appliance that's not working
Discover the basics of cleaning and oiling your sewing machine, and how to protect it when not in use.
See what to check if the thread is bunching under the fabric as you sew.