What embroidery tension is
Tension is the pull on the upper (needle) thread and the lower (bobbin) thread as they lock together to form each stitch. When the two pull in balance, the stitches sit neatly in the fabric. When one dominates, you may see loops, puckering, thread breaks or one thread showing on the wrong side.
The thirds rule
A widely used visual check: stitch a column of satin stitches, then turn the fabric over. On the underside you want a band of bobbin thread down the centre, roughly a third of the column width, with the upper thread visible on both sides. Some sources describe the bobbin band as roughly a quarter to a third. Treat it as a guide rather than an exact measurement.
- Too much bobbin thread showing, or bobbin thread pulled up to the top: the upper tension is probably too tight, or the bobbin tension too loose.
- No bobbin thread visible, with upper thread wrapping to the underside: the upper tension is probably too loose, or the bobbin tension too tight.
Signs tension is too tight or too loose
| What you see | Likely meaning |
|---|---|
| Fabric puckers around the design | Upper tension may be too tight (also check hooping and stabilizer) |
| Bobbin thread visible on top | Upper too tight and/or bobbin too loose |
| Loops of thread on top | Upper too loose, or threading problem |
| Frequent thread breaks | Tension too tight, or a needle or thread problem |
| Upper thread pulled to the back | Upper too loose and/or bobbin too tight |
Before touching a dial
Many “tension problems” are not tension problems. Check these first:
- Rethread the upper thread fully with the presser foot up so the thread seats in the tension discs.
- Make sure the bobbin is inserted correctly and wound evenly.
- Clean lint from the bobbin case and surrounding area.
- Install a fresh, correct needle.
- Confirm the fabric is hooped evenly with suitable stabilizer.
How to adjust upper tension
- Find your tension control. Many domestic machines use an on-screen setting or a dial, while many commercial multi-needle machines use physical knobs.
- Change it in small steps. In general, turning clockwise or increasing the number tightens, and the opposite loosens, but check your manual.
- Stitch a test after each change.
- Change only one thing at a time.
Start from your manufacturer’s default setting and only move away from it if the test stitch shows a consistent imbalance.
Bobbin tension
Bobbin tension is typically adjusted less often than upper tension. Clean the bobbin case first, because lint is a common cause of inconsistent tension. Some embroiderers use a bobbin tension gauge or a drop test, in which the bobbin case hangs from its thread and should drop slightly with a gentle tug and then stop. Target values differ by machine and bobbin type, so follow your manufacturer’s guidance. If your machine has a screw on the bobbin case, make only tiny adjustments, mark the starting position, and consult the manual or a technician if you are unsure.
Test stitch-out
Before stitching on a final item:
- Hoop a scrap of the same fabric with the same stabilizer.
- Stitch a design with satin columns, or a simple test pattern.
- Check the front and back.
- Adjust and retest.
Some embroiderers use contrasting thread colors in the top and bobbin so the balance is easier to see.
Why is my machine only showing bobbin thread?
If the top of the design looks like it is made of bobbin thread, the upper thread is usually not being pulled into the tension properly. Common causes include the upper thread not seated in the tension discs because it was threaded with the presser foot down, a missed thread guide, or tension set far too tight. Rethread completely, check the bobbin, and test again. If it persists, have the machine inspected.
Why does fabric pucker?
Tension that is too tight is one cause, but puckering is often due to poor hooping or insufficient stabilizer. See machine embroidery problems and fixes for a fuller checklist.
Adjusting bobbin tension on a Brother machine
Models differ. Some Brother embroidery machines use a bobbin case with a tension screw, others use a drop-in bobbin, and some have a removable case that is adjusted only with the manufacturer’s recommended procedure. Look up your model’s manual or official support page and follow its instructions, because over-adjusting a bobbin screw is easy to do and hard to undo.
Thread, fabric and stabilizer factors
- Thread: rayon, polyester and metallic threads can behave differently; metallics often need slower speeds and a different tension setting.
- Fabric: sheer fabrics and heavy denim have different requirements, and stretchy fabrics are easier to distort. See what fabric is best for embroidery.
- Stabilizer: inadequate support can look like a tension problem.
- Design: dense areas add strain on the thread and fabric.
Maintenance
Regular cleaning, fresh needles, and routine servicing as recommended by the manufacturer help keep tension stable from one project to the next. If you are new to the craft overall, the stitched vs embroidered overview covers the basics.