Thread the machine before you sew anything

Threading is the first step every time you use your machine. The thread path is the same on most machines: it starts at the spool pin at the top, runs down through the tension discs, then through the presser foot lever, and finally through the needle. If the thread is not in the right path, your stitches will bunch, break, or not form at all.

Raise the presser foot lever — this opens the tension discs so thread can pass through. Place your spool on the pin at the top of the machine and guide the thread down through each guide and tension point in order. The exact path depends on your machine model, so check your manual for a diagram. Once the thread reaches the needle, insert it from front to back, making sure it sits in the needle's groove. Leave a 6-inch tail hanging below the needle.

The bobbin — the small spool underneath — also needs thread. Wind thread onto an empty bobbin using the bobbin winder on your machine, then insert the full bobbin into the bobbin case. Pull the bobbin thread up through the slot in the bobbin case so it sits next to the needle thread. You now have both threads ready to stitch.

Key Takeaways

  • Thread must follow the correct path from spool to needle, with the presser foot lever raised so the tension discs open.
  • The bobbin underneath holds thread that locks with the needle thread to form a stitch, and must be wound and inserted before you sew.
  • Needle size and thread weight must match your fabric — use a size 70/10 needle for lightweight cotton and a size 100/16 for heavy denim.
  • Stitch length is measured in millimetres; 2.5 mm is standard for most seams, and shorter stitches (1.5 mm) are stronger for stress points.
  • Presser foot pressure and tension settings control how evenly the machine feeds fabric and locks the two threads together.

Choose the right needle and thread for your fabric

The needle is not one-size-fits-all. Needle size is marked as two numbers — for example, 70/10 or 100/16. The first number is the European size, the second is the American size. A size 70/10 is thin and works for lightweight fabrics like cotton lawn and silk. A size 90/14 handles medium-weight cotton and linen. A size 100/16 or 110/18 is for heavy fabrics like denim, canvas, and upholstery.

Using the wrong needle size damages fabric and breaks thread. A needle that is too thin will bend or break under pressure. A needle that is too thick will leave visible holes in delicate fabric and can snag threads. Check your fabric weight before you buy needles — most fabric labels or store staff can tell you whether a fabric is lightweight, medium, or heavy.

Thread weight should also match your fabric. All-purpose polyester thread works for most sewing. Heavier thread (like topstitching thread) is thicker and shows more, so use it only when you want the stitching to be visible. Lightweight thread is for delicate fabrics. The thread spool label usually says what weight it is and what fabrics it suits.

Set stitch length and tension before you start

Stitch length is how far the needle moves forward with each stitch, measured in millimetres. Most machines have a dial or digital display to adjust it. A length of 2.5 mm is standard for regular seams on medium-weight fabric. Shorter stitches (1.5 to 2 mm) are stronger and suit stress points like seams that will take weight or movement. Longer stitches (3 to 4 mm) are for basting — temporary stitches you remove later — or for quilting.

Tension controls how tightly the needle thread and bobbin thread lock together. On most machines, tension is a numbered dial from 0 to 9, with 4 or 5 as the default. If your stitches look loose and loopy on top, tension is too loose — turn the dial up. If stitches bunch underneath, tension is too tight — turn the dial down. Test on scrap fabric first. Tension rarely needs to change unless you switch to a very different thread weight or fabric type.

Presser foot pressure controls how hard the foot pushes fabric against the feed dogs (the metal teeth that move fabric forward). Most machines have a dial or lever for this. Standard pressure works for most fabrics. Reduce pressure for delicate fabrics so you do not stretch them. Increase pressure for thick or slippery fabrics so they feed evenly. Again, test on scrap fabric before sewing your project.

Load fabric and start sewing

Place your fabric under the presser foot with the edge aligned to the seam allowance marking on the needle plate (usually a line 5/8 inch from the needle). Lower the presser foot — this engages the tension discs and holds the fabric in place. Hold both the needle thread and bobbin thread tails in your left hand and take one stitch by hand, turning the wheel toward you. This pulls the bobbin thread up through the fabric so both threads are ready.

Release the thread tails and begin sewing by pressing the foot pedal slowly. The machine will feed fabric forward automatically. Guide the fabric with your hands but do not pull it — the feed dogs do the work. Keep your hands clear of the needle. Sew at a steady pace; rushing causes skipped stitches and broken thread.

To turn a corner, stop with the needle down in the fabric, raise the presser foot, pivot the fabric 90 degrees, lower the presser foot again, and continue. To remove fabric, raise the presser foot and slide the fabric out. Trim the thread tails to about 1/4 inch.

Fix common problems: skipped stitches and thread breaks

Skipped stitches — places where the needle misses the bobbin thread — usually mean the needle is bent, inserted wrong, or the wrong size for your fabric. Remove the needle, check it for bends (hold it up to light), and reinsert it making sure it is fully seated. If it is bent, replace it. If the problem continues, try a needle one size larger.

Thread breaks during sewing most often because tension is too tight, the needle is bent, or thread is caught on something. Stop, raise the presser foot to release tension, and rethread both the needle and bobbin. Check that thread is not snagged on the spool pin or caught under the presser foot. If thread keeps breaking after rethreading, the needle is probably bent — replace it.

Bunched or loopy stitches on the bottom of fabric mean bobbin tension is too loose or the bobbin is not inserted correctly. Remove the bobbin case, check that the bobbin is wound evenly and fully, and reinsert it. If that does not work, the bobbin case tension screw may need adjustment — this is a small screw on the bobbin case itself. Turn it slightly clockwise to tighten. Make only tiny adjustments; one full turn is usually too much.

Clean and maintain your machine

Lint and thread scraps collect under the presser foot and in the bobbin area. After every project, raise the presser foot, remove the needle plate (usually held by one or two screws), and brush out lint with a small brush. Most machines come with a lint brush; if yours did not, a soft toothbrush works. Do not use compressed air — it can blow lint deeper into the machine.

Oil your machine only if the manual says to do so. Many modern machines are sealed and do not need oil. If yours does, use only sewing machine oil, not household oil. explore one drop to the points the manual shows, usually where metal parts move. Too much oil stains fabric, so use very little.

Have your machine serviced by a professional every two to three years if you sew regularly, or every five years if you sew occasionally. A technician can clean internal parts, check tension, and replace worn components. This costs 50 to 150 dollars depending on your location and machine, but extends the life of your machine by years.

Frequently Asked Questions

Why does my thread keep breaking?

Thread breaks when tension is too tight, the needle is bent or inserted wrong, or thread is snagged. Raise the presser foot to release tension, rethread both the needle and bobbin, and check that thread is not caught on the spool pin. If breaking continues, replace the needle — bent needles are the most common cause.

What is the difference between a straight stitch and a zigzag stitch?

A straight stitch goes in a line and is used for regular seams. A zigzag stitch moves side to side and is used to finish raw edges so they do not fray, or to sew stretchy fabrics like knit. Your machine has a stitch selector dial or screen — turn it to the stitch you want before you sew. Straight stitch is usually the default.

Can I sew over pins?

No. Sewing over a pin can break the needle, damage the machine, or cause the needle to skip stitches. Remove pins as you sew, or use a walking foot if your machine has one — it feeds thick or slippery layers more evenly than a standard foot.

How do I know if my needle is inserted correctly?

The needle should slide into the needle clamp until it stops, then the clamp screw is tightened. On most machines, the flat side of the needle faces a certain direction — check your manual for which way. If the needle is loose or facing the wrong way, it will skip stitches or break.

What should I do if my machine makes a loud noise?

A loud noise usually means lint is stuck in the bobbin area or the needle is bent. Raise the presser foot, remove the needle plate, and brush out lint. Replace the needle. If the noise continues, the machine may need professional service — do not keep sewing, as you may damage internal parts.