Sergers

Coverstitch Machine: What It Does and Who Needs One

Many sewists start making clothes with just a sewing machine and a serger. Then they notice that their hems don't look like the ones on store-bought clothes, even though the seams are clean. That is when most people look at a coverstitch machine. This page covers what the machine adds, how it differs from a combo machine, and what to check before you buy one.

What a coverstitch machine does

A coverstitch machine makes the flat hem with parallel rows of stitches that you see on most knit clothes. Look at the hem of almost any t-shirt and you will see it. It does not trim fabric like a serger does. It works on a folded edge, the hem, not a raw one. It usually uses 2 or 3 needle threads, plus one looper thread underneath.

Dedicated machine vs. combination machine

Some sergers have a coverstitch mode. To switch jobs, you change the needle plate, the stitch fingers and the way the thread runs. That saves you from buying a second machine.

But you face a real setup job each time you switch. A machine that only does coverstitch skips all of that. The cost is that you own, and store, a second machine.

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Is it worth it for you

If you hem a knit project now and then, a combo machine is a fair stand-in. So is the twin-needle stretch stitch on a sewing machine. A machine that only does coverstitch earns its place once you make clothes often, not just once in a while. See Coverstitch, Explained if you are still not sure you need this stitch at all.

Comparing dedicated machines by price tier

Entry-level coverstitch machines usually sew the core two and three-needle stitches. They have basic differential feed too. Pricier models add a wider choice of needle spacing and finer tension control for each thread.

Some also add a chain stitch for basting or decorative work. For most home sewists who hem knits now and then or often, the entry-level features cover the job well. The extra features matter more if you sew a lot of clothes or want many hem styles.

What to look for if you do buy one

Beyond the basic stitch, a few features help on a coverstitch machine. The first is a range of needle spacing, which changes how many rows the hem shows and how far apart they sit. The second is differential feed, which helps with knits of different weights. The third is a clear threading guide, since threading one is at least as fiddly as threading a serger.

Some models also sew a separate chain stitch. That is handy for basting or some decorative seams. You do not need it for basic hems on clothes.

Needle spacing and how it changes the finished look

Most coverstitch machines let you sew with two or three needles. Some also let you change the space between them. Wide spacing gives a bold, clear row of stitches, like you see on sportswear.

Narrow spacing gives a quieter finish, closer to a basic t-shirt hem. If your machine lets you, sew a test hem on your real project fabric with two spacing options. Do this before you sew a hem that will show on a finished piece.

Maintenance differences from a serger

A coverstitch machine has no cutting knife. So it makes less lint and fewer fabric scraps than a serger, and it needs cleaning a little less often. It still needs regular brushing around the loopers and the needle area.

Change the needles about as often as you would on a serger, since these machines also run fast next to a normal sewing machine. Thread tension matters just as much as on a serger. The same habit applies: test on a scrap of your project fabric before you sew the real hem.

Budgeting for a first coverstitch purchase

A coverstitch machine is often the second or third machine in a sewing room. Most people buy it after a sewing machine, and often after a serger too. So be sure you will use it often before you buy one. If you don't yet know how often you will hem knits, try a cheaper route first.

A combo serger and coverstitch machine works. So does the twin-needle stretch stitch on your sewing machine. Both give you a coverstitch-style hem while you find out.

Switching between modes on a combination machine

If you choose a combo machine, expect some work each time you switch from overlock to coverstitch. You remove and refit the needle plate. You adjust the stitch fingers. You rethread at least part of the machine.

Most makers design this to take a few minutes once you know the steps. It is still slower than picking up a second machine that is already threaded for its job. Whether that trade is worth it depends on how often you switch between the two stitches in one sewing session.