The needle goes up and down and the fabric does not move, so the machine stitches a knot in one spot. It feels like a broken machine and is usually a setting, a piece of lint, or a foot that is not doing its job. Work through the checks below in order, and stop at the first one that fails. Most of the time it is the first three.
The cheapest check is the one you forgot
Look at the feed dog drop control before anything else. On many machines it is a lever or a sliding button near the bed; on others it is a push-button that locks the dog below the plate. It gets moved for free-motion work, darning, or buttonholes and does not always get moved back.
Turn the handwheel by hand and watch the slot in the plate. If no teeth appear, the dog is dropped or stuck below. That single observation saves the rest of this page, and it is also the one check that needs no tools.
Confirm the stitch length is doing something
Set a straight stitch at a length you can see, then turn the handwheel through one full stitch and watch the fabric. On a mechanical machine the lever or dial moves a linkage that swings the feed. If the setting is at zero, or the machine is set to a stitch pattern that does not advance, the fabric stays put by design.
Stitch length linkage can also be the fault: a lever that moves without changing the stitch is a linkage problem, not a feed dog problem. Test by moving the setting through its full range and watching whether the stitch length on a scrap actually changes.
Pressure, the foot, and the fabric in between
The feed dog pulls; the presser foot holds. If the foot is not pressing, the dog lifts the fabric and drops it in the same place.
- The foot is not down. Check the lever and the knee lift if the machine has one.
- A snap-on foot is not clicked on. It hangs slightly low, looks right, and applies almost no pressure.
- The pressure is set too light for the fabric, usually after someone adjusted it for a slippery lining and never set it back.
- The wrong foot is fitted. An embroidery or free-motion foot has no pressure to speak of, and a foot with a broken spring feels normal in the hand.
Lint in the well and a plate that grips
Fibre packs into the feed dog well until the dog travels in a mat. The teeth still rise, they just do not reach the fabric. Brush the well out with the plate off, then turn the handwheel and watch the teeth clear the plate again.
While the plate is off, run a fingernail along the slot edges. A burr or a lip catches the fabric and holds it back, which produces the odd sensation of a dog that is working while the fabric still stalls. A plate that is not seated flat, or a plate screw that is loose, does the same thing.
When the fabric is the problem
Some material defeats a perfectly healthy feed dog:
- Slippery linings and satin. The teeth cannot grip a surface with no texture.
- Thin knits and jersey. The fabric stretches instead of advancing, and the seam grows as you sew.
- Coated fabrics, vinyl, and leather. They stick to the plate and resist the teeth.
- Very fine fabric over a wide plate slot. The fabric dips into the slot and the dog cannot reach it.
For these, change the interface rather than the machine: a straight-stitch plate with a narrow slot, a walking foot or even-feed foot, a layer of tissue or stabiliser underneath, or a finer needle so the fabric is not pushed down.
A test that separates feed from technique
Mark two inches on a scrap of the actual fabric with a ruler and a pencil. Sew along the line at a moderate length, then measure the result against the mark.
| What the test shows | What it means | Where to look next |
|---|---|---|
| Seam much shorter than the mark | Fabric was held back | Pressure, plate burr, dog height |
| Seam much longer than the mark | Fabric was stretched | Pressure too heavy, a dragging foot, knit fabric |
| Seam the right length but wavy | Transport is fine | Tension or needle |
| Fabric never moved at all | No transport | Drop lever, stitch length, foot not down |
Repeat the test after each change. One variable at a time, or you will not know which one worked.
Where the owner-technician boundary sits
Owner work: the drop lever, stitch length, presser foot pressure, foot fitting, brushing the well, plate screws, and the measure-and-sew test. Technician work: a stitch length linkage that moves without changing the stitch, a dog that will not stay up, a bent carrier, and a machine where every owner check passes and the fabric still will not advance. Also treat a sudden change in feed, with no setting altered, as a mechanical fault worth diagnosing rather than a technique problem.
Related guides
- Sewing machine feed dogs — wear, height, and replacement.
- Feed dogs won’t rise — when the lever moves and nothing comes up.
- Sewing machine feed mechanism — drop feed, differential, and walking feet.
- Sewing machine presser foot — the pressure side of transport.
- Sewing machine needle plate — slot width and plate condition.