What is it?
Your serger has two sets of feed dogs. Differential feed changes how fast the front set moves compared to the back — so fabric can be eased in, gathered, or gently stretched.
When should you use it?
- Creating ruffles and controlled gathers
- Stopping knit seams from going wavy
- Reducing puckering on fine fabrics
- Easing in fullness on curved seams
What fabrics work well?
Lightweight fabrics gather most easily. Knits benefit from adjustment to stay flat. Heavier fabrics gather less.
How many threads?
Differential feed works with whichever stitch you are sewing — often a 3- or 4-thread overlock for gathering.
What should the finished stitch look like?
For everyday sewing, a flat seam with no ripples or puckers. For gathering, evenly distributed gathers along the edge.
Common problems
- Unexpected gathers — return differential feed to normal / neutral
- Wavy knit seams — your manual will explain which direction to adjust
- Not enough gathering — lighter fabrics gather more readily
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