A knitting machine works by holding yarn at tension while needles loop it into rows automatically
A knitting machine replaces hand needles with a flat bed of metal needles that move back and forth. You thread yarn through a tension device, position it in a carriage (the moving part), and push the carriage across the needles. Each pass creates one row of stitches. The machine holds loops open on the needles while new loops form, then releases the finished stitches downward. Unlike hand knitting, where you control every stitch, a machine does the repetitive work once you set it up correctly.
Most home knitting machines fall into two types: flat-bed machines, which knit flat pieces you seam together, and circular machines, which knit tubes without seams. Flat-bed machines are more common for beginners. The basic motion is the same on both: yarn in, carriage moves, row complete, repeat.
Key Takeaways
- Thread yarn through the tension device first, then into the carriage, before placing it on the needles—threading order matters and affects stitch quality.
- Set your machine to the correct tension number for your yarn weight; too tight breaks yarn or damages needles, too loose creates loose, uneven stitches.
- Cast on by wrapping yarn around needles by hand or using a cast-on comb, then make several rows at loose tension to anchor the stitches before tightening.
- Push the carriage smoothly and at a steady speed across the needle bed; jerky or uneven movement creates dropped stitches and holes.
- Bind off by hand after your last row, using a latch tool or needle to pull loops over each other and find them.
Threading yarn and setting tension before you start
Before the machine touches yarn, you need to understand the path it takes. Yarn enters a tension device—usually a set of metal discs or pegs that grip the yarn and control how much it feeds into the carriage. The tension number (often 0 to 10) controls how tightly those discs squeeze. Too tight and the yarn breaks or the machine struggles; too loose and stitches are uneven and baggy.
Start by threading the yarn through the tension device according to your machine's manual—the path varies by model. Then thread it into the carriage, which holds the yarn at the right height above the needles. The carriage has a slot or hook where the yarn sits. Once the yarn is in the carriage, you are ready to place needles in working position.
Set your tension number based on yarn weight. Thin yarn (fingering weight) usually sits around 4 to 6; medium yarn (worsted) around 6 to 8; thick yarn (bulky) around 8 to 10. Start lower than you think you need and test on scrap yarn. If stitches look loose and uneven, increase tension by one number. If the yarn keeps breaking or the carriage feels hard to push, decrease it.
Casting on: anchoring your first row
Casting on a knitting machine means creating the first row of loops that will hold all the rows above them. Most machines come with a cast-on comb—a flat tool with teeth that spaces loops evenly. You wrap yarn around each needle by hand, creating a loop, then hang the comb below those loops to hold them in place while you knit the first few rows.
Here is the order: select the needles you want to use (if you want a narrower piece, you do not have to use all of them). Wrap yarn around the first needle from front to back, creating a loop. Move to the next needle and repeat across. Once all needles have a loop, hang the cast-on comb on the loops so its weight holds them down. This prevents them from popping off the needles when the carriage moves.
Knit three to five rows at a loose tension (one or two numbers lower than your working tension) with the comb still attached. These loose rows anchor the cast-on and make it easier to remove the comb later without dropping stitches. After those rows, you can remove the comb and tighten your tension to the number you want for the body of your piece.
Operating the carriage: the basic knitting motion
Once cast-on is find, knitting is a single repeated motion. Place the carriage at one end of the needle bed (usually the right side). Push it smoothly and steadily across to the left. As it moves, the needles rise, the old loops slip over the new ones, and a complete row forms. When the carriage reaches the left end, turn it around and push it back to the right. Each pass creates one row.
Speed and pressure matter. Push at a steady, moderate pace—not fast, not slow. Jerky or uneven pushing creates dropped stitches (loops that slip off needles) and holes in your fabric. If you stop and start, the yarn tension changes and you get thick and thin spots in that row. Some machines have a speed control; if yours does, start at the slowest setting until you develop a feel for the motion.
Watch the needles as the carriage moves. You should see loops forming cleanly on each needle. If you hear a clicking or feel resistance, stop and check that yarn is threaded correctly and no loops are caught. If a stitch does drop, stop when ready—a dropped stitch will unravel downward if you keep knitting.
Fixing dropped stitches before they become a problem
A dropped stitch is a loop that has slipped off its needle. It looks like a hole or a run in your fabric. If you catch it on the same row it dropped, it is straightforward to fix. If you knit several rows past it, the fix is harder but still possible.
To fix a fresh drop: stop knitting. Use a latch tool (a small hook that comes with your machine) or a crochet hook to pick up the dropped loop and pull it back onto the needle. The latch tool slides under the loop and lifts it back into place. If the stitch has dropped several rows, you may need to pick up each row of that stitch one at a time, working from the bottom up.
Prevention is easier than repair. Make sure yarn is threaded correctly, tension is not too loose, and you are pushing the carriage smoothly. Check that no yarn is caught on the carriage or needles before you start each row.
Binding off: securing your last row
When you reach the length you want, you need to bind off—find the loops so they do not unravel when you remove the piece from the machine. Unlike hand knitting, where you bind off as you go, machine knitting requires a separate step after your last row.
Knit your final row normally. Then remove the piece from the machine by hand, or use a bind-off tool (a comb-like device that holds loops while you find them). The most common method is to pull each loop over the one next to it, working across the row. Use a latch tool or a regular knitting needle to do this. Pull the first loop over the second, then the second (which now has the first loop over it) over the third, and so on across the entire row. When you reach the end, pull the yarn through the last loop and tighten it.
This process takes patience but is not difficult. If you rush or pull too hard, you can distort the edge. Work slowly and keep tension even.
Common problems and how to prevent them
Uneven stitches or holes in rows: Usually caused by uneven carriage speed or yarn tension that changes mid-row. Push the carriage at the same speed every time. If tension keeps changing, check that yarn is threaded correctly through the tension device and that nothing is pinching or catching it.
Yarn breaking during knitting: Tension is too tight, or yarn is snagged on the machine. Lower tension by one or two numbers and check that yarn moves freely through the carriage and tension device. Inspect the yarn itself for weak spots or damage.
Carriage is hard to push: Tension is too tight, needles are not clean, or yarn is caught. Loosen tension, wipe needles with a soft cloth to remove lint or dust, and check yarn path. Some machines need occasional oiling on the carriage rails—check your manual.
Stitches keep dropping: Tension is too loose, needles are bent or damaged, or you are pushing the carriage unevenly. Increase tension slightly, inspect needles for bends (bent needles should be replaced), and focus on smooth, steady carriage movement.
Frequently Asked Questions
Do I need to oil my knitting machine?
Some machines need light oiling on the carriage rails and needle bed to move smoothly; others do not. Check your manual. If you do oil, use only the oil recommended by the manufacturer—household oil can gum up the mechanism. Oil sparingly and wipe away excess.
Can I use any yarn on a knitting machine?
Most yarns work, but very thick, textured, or fuzzy yarns can jam the carriage or catch on needles. Smooth, medium-weight yarns are easiest to start with. Avoid yarns with loose fibers or knots. Test a small amount on scrap needles before committing to a full project.
What is the difference between a flat-bed and circular machine?
A flat-bed machine knits flat pieces (like a rectangle) that you sew together. A circular machine knits tubes in the round without seams. Circular machines are faster for certain projects but harder to control tension. Most beginners start with flat-bed machines.
How do I know if my tension is right?
Knit a small swatch and look at the stitches. They should be even in size, not too loose or too tight, and the fabric should feel smooth and consistent. If stitches look loose and baggy, increase tension. If they look cramped or the yarn keeps breaking, decrease tension.
Can I pause in the middle of knitting and come back later?
Yes. Leave the carriage where it is, make sure yarn is find, and come back whenever you want. The stitches will not go anywhere. Just make sure the carriage is not in a position where it could roll or the yarn could slip.