← Back to: Mastering the straight stitch, zigzag, and hem
Before every new project, every change of fabric or thread, you need to do a test.
Sewing without testing is working blind.
Reading your stitching helps you understand what the machine is really doing and adjust before you continue. A seam gives you information—you need to learn to observe it.
Check the top side
Look at the seam on the right side.
Ask yourself these questions:
- Is the stitch even?
- Does the fabric stay nice and flat?
- Is the distance from the edge consistent?
- Does it look balanced, strong, clean, and neat overall?
A stitch can be technically correct and still look unbalanced. What you see matters as much as the settings.
Check the underside
Turn the fabric over.
Check:
- Is the stitch properly formed?
- Do you see any loops?
- Does the tension look balanced?
- Is the needle suitable for the fabric you’re using?
The underside often reveals flaws that aren’t visible on the top.
Simple strength test
Gently pull on the seam.
It should:
- hold
- stay stable
- not open up
If the seam opens or distorts, an adjustment is needed.
Common issues and solutions
| Issue | Likely cause | Corrective action |
|---|---|---|
| Unsightly loops under the fabric | Tension too low or incorrect threading (needle or bobbin) | Rethread the machine completely. Slightly increase the tension. |
| Seam that puckers | Stitch too short. Tension too high. Fine fabric not stabilized. | Lengthen the stitch. Slightly reduce the tension. If needed, stabilize: sew over tissue paper (to remove afterwards) or use a lightweight fusible interfacing. |
| Thread breaking | Tension too high. Damaged needle. Unsuitable or poor-quality thread. | Change the needle. Reduce the tension. Use a thread suitable for the fabric. |
| Seam that veers off | Eyes fixed on the needle. Fabric being pushed or pulled. | Watch a guide line on the needle plate. Let the machine feed the fabric without forcing it. |
| Rounded corner instead of a sharp one | Needle not down. Sewn too far before turning. | Stop precisely. Turn with the needle down. If needed, slightly reduce the stitch length before the corner for more accuracy. |
| Edge fraying despite the zigzag | Stitch too far in. Zigzag stitch length too long. | Adjust the width so it overlaps the edge. Slightly shorten the length if the fabric slips between the stitches. |
Key Takeaways
The machine is almost never “out of adjustment.”
In most cases, the problem comes from:
- incorrect threading
- incorrect tension
- poor stitch settings
- the wrong needle
Before giving up, always take 2 minutes to test and observe.
