The dial settings run from 0 to 9, so 4.5 is generally the ‘default’ position for normal straight-stitch sewing. This should be suitable for most fabrics. If you are doing a zig-zag stitch, or another stitch that has width, then you may find that the bobbin thread is pulled through to the top.
Why does my bobbin thread keep breaking?
A dirty shuttle race, improper thread routing or incorrect thread tension can break the bobbin thread in a sewing machine. Unplug the sewing machine and check thread routing according to guidelines in your owner’s manual. Reroute the thread correctly if necessary.
Why does my cotton keep breaking?
When your sewing machine thread keeps breaking, check for fluff and lint deposits that may interfere with the machine’s smooth operation. (How to clean a sewing machine) Double-check the bobbin and its casing as often a bit of thread may be caught there and if it has snapped off will affect your tension.
What tension should I use for cotton?
Cotton requires a moderate tension setting, usually between three and four. Always start adjusting your tension settings with your upper tension.
How do you know thread tension is correct?
A correct thread tension looks smooth and flat on both sides of the seam. The needle and bobbin threads interlock midway between the surfaces of the material.
How do I know if my bobbin tension is correct?
The thread should unwind just slightly and the bobbin case should drop an inch or two. If the thread unwinds without resistance and the case slips to the floor, your bobbin tension is too loose. If the bobbin case doesn’t budge, your bobbin tension is too tight.
How do you adjust upper thread tension?
To increase your top tension if it’s too loose, turn your knob so that the numbers are increasing. Try ½ to 1 number higher, then test the stitches on a piece of scrap fabric. Continue until it looks even on both sides and you can no longer see the bobbin thread on the right side of the fabric.
Why does my fabric gathering when I sew?
Tension pucker is caused while sewing with too much tension, thereby causing a stretch in the thread. After sewing, the thread relaxes. As it attempts to recover its original length, it gathers up the seam, causing the pucker, which cannot be immediately seen; and may be noticeable at a later stage.
