Many home craftsmen mistakenly believe that full-fledged edge processing is impossible without purchasing a separate, expensive overlocker, but modern household machines are equipped with functionality that allows them to imitate this seam with high accuracy. To get a high-quality result, you need to set it up right away upper thread tension and select the appropriate presser foot, since ignoring these parameters will lead to the fabric tightening or forming a “loop.” A correctly executed imitation overlock will not only prevent the cut from fraying, but will also give the product a professional look comparable to factory sewing quality.
The secret lies in the right combination of fabric advancement mechanism and operation needle bar. When you switch the machine to edge finishing mode, the needle path often changes, allowing you to grab more fabric from the sides. If you try to stitch an edge without first adjusting zigzag width, the machine may skip stitches or, conversely, break the needle on the edge of the needle plate. It is important to understand the difference between a simple zigzag and a complex overlock stitch, which weaves threads around the cut from several sides.
Use special threads for overlockers or thin threads No. 50-60 to make the seam flat and elastic, without creating excess volume on the seams.
Differences between an overlocker and a household machine
The fundamental difference is the number of threads involved in the formation of the stitch. A classic overlocker uses three to five threads at a time: two needle threads and two or three looper threads, creating a strong elastic seam that stretches along with the knitwear. A household machine, even with an overlock stitch function, works with a maximum of two threads (top and bottom), forming a stitch according to the principle shuttle mechanism. This means that the imitation will always be less elastic than the original, although for many fabrics the difference is almost unnoticeable.
The second important difference is the presence of a knife. A true overlocker trims away excess fabric just before stitching, ensuring a perfectly straight edge. On a regular machine, you will either have to pre-cut the cut with scissors, or use a special foot with a guide that helps guide the fabric at a certain distance from the edge. Ignore pre-cut can cause uneven seams and fuzzy fabrics to look untidy.
Is it possible to sew knitwear on a regular machine?
Yes, you can if you use a special needle with a rounded tip (Stretch or Jersey type) and set the mode to prevent skipping stitches. However, for mass sewing of elastic fabrics, an overlocker is better suited.
Necessary equipment and feet
For high-quality imitation of an overlock seam, a standard presser foot is often not suitable, since it does not provide the necessary control over the edge of the fabric. The optimal solution is to use overlock stitch feet (often marked with the letter “G” or has a special stop on the side). This stopper prevents the fabric from moving to the right or left, fixing the cut at the desired distance from the needle, which is critical for stitch uniformity.
If you don't have a specialized foot, you can use an open-soled zigzag foot or even a regular foot, but in this case you will have to control it manually, which requires a lot of concentration. There are also universal feet that are suitable for many operations, but they are less effective when processing edges. When installing a new presser foot, be sure to lower needle to the down positionto properly align the mounting screw with the holder.
- 🧵 Foot with a side stop - fixes the edge of the fabric at a given distance.
- 🧵 Open zigzag foot - allows you to see the puncture site and control the needle entry.
- 🧵 Teflon foot - necessary for sliding on sticky or leatherette when processing the edge.
- 🧵 Foot with a guide ruler - helps to maintain parallelism of the seam relative to the edge.
Setting up the machine for overlock stitching
Before starting work, you must switch the machine to the appropriate mode. On the control panel or mechanical switch, select a symbol that resembles the letter "M" or a complex zigzag with several punctures at one point. In modern models Janome, Brother or AstraLux this mode may be called "Overlock", "Overcast" or "Overedge". After selecting a mode, the machine will automatically limit the maximum stitch width and length, but manual adjustment of the parameters is often necessary.
The key parameter is stitch width. To imitate an overlock, it should be maximum or close to it (usually 5-7 mm) so that the thread goes around the edge of the fabric. The stitch length, on the contrary, is set to medium (2-3 mm) so that the seam is tight and does not show through. If you are working with thin fabrics, the length can be reduced, and for thick denim fabrics, it can be increased to avoid cutting through the material.
Seam making technology step by step
The process of laying an overlock seam requires following a certain sequence of actions. First, prepare the cut: if the fabric is fraying a lot, baste the edge or use spray adhesive to temporarily fix the threads. Set the needle to the extreme left position (if the machine model allows adjustment), so that with a wide zigzag, the right puncture falls exactly on the edge of the fabric or extends slightly beyond it.
Place the fabric under the foot so that the cut rests against the side stop. Lower the needle manually (by turning the handwheel toward you) to make sure the right piercing is catching the edge. Press the pedal and start stitching, stretching the fabric slightly in front of the foot (for knits) or just guiding it (for fabrics) so that the edge constantly touches the stopper.
☑️ Checklist before you start sewing
Adjusting thread tension
The quality of an overlock seam depends 90% on the correct upper thread tension. Unlike a straight stitch, the tension often has to be loosened so that the bottom thread can freely come out to the right side and form a beautiful wraparound edge. If the tension is too strong, the edge of the fabric will curl up and the seam will be stiff and pulled together.
Always check the quality of the setting on a sample of the same fabric from which the product is cut. Look at the inside: the threads should lie flat, without loops or puffs. If you see that the upper thread is pulling the fabric, reduce the setting on the tension dial. If the thread lies too loosely and forms loops, tension needs to be added.
⚠️ Attention: When working with elastic fabrics (knitwear, stretch), be sure to use needles with a rounded tip (Stretch/Jersey), otherwise you will damage the structure of the fibers and the seam will wave or tear when worn.
Table for selecting parameters for different fabrics
To help you set up your machine, use the following table for recommended settings for different types of materials. Remember that these values are starting values, and final refinement is best done experimentally.
| Fabric type | Stitch Width (mm) | Stitch length(mm) | Thread tension | Needle type |
|---|---|---|---|---|
| Thin knitwear | 4.0 - 5.0 | 2.0 - 2.5 | Weakened | Stretch (75) |
| Thick cotton | 5.0 - 6.0 | 2.5 - 3.0 | Average | Universal (90) |
| Jeans | 6.0 - 7.0 | 3.0 - 3.5 | Enhanced | Jeans (100) |
| Silk/Chiffon | 3.0 - 4.0 | 1.5 - 2.0 | Minimum | Microtex (70) |
The main secret to an even overlock seam is not to pull the fabric with your hands from behind the foot, but only slightly guide it in front, allowing the feed mechanism to work independently.
Typical errors and ways to resolve them
One of the most common problems is thread looping on the wrong side. This occurs when the top thread is not pulled tight enough or when the needle is dull and does not create the correct loop to catch the bottom thread. It may also be caused by incorrect threading. tension lever, which is often missed in a hurry.
Another mistake is using too thick threads in combination with a narrow needle. The thread should pass freely through the eye of the needle and the channels of the machine. If the thread is too thick, it will snag, break, or create knots under the fabric. Always match the thread number to the needle number.
⚠️ Attention: Never pull the fabric by force while the machine is running, especially when doing a wide zigzag. This can lead to needle breakage, seam distortion, and even damage to the shuttle mechanism.
If the edge of the fabric still curls inward, try using a stabilizer (a strip of paper or special tape) that is placed under the fabric and removed after sewing. Changing the position of the needle also helps: move it a little to the left so that the right zigzag puncture falls exactly on the very edge of the cut, slightly clasping it.
What to do if the seam is wavy?
Check to see if the thread is too tight, use a smaller needle and try stitching the pattern using stabilizer underneath the fabric.
Frequently asked questions (FAQ)
Is it possible to make a real overlock stitch on a regular machine?
Technically, a true three- or four-thread stitch cannot be made on a regular machine, since it does not have loopers. However, special stitches (overlock, edge) bring the quality of processing as close as possible to overlock, reliably overcasting the edge.
What threads are best to use to imitate overlock?
Thin polyester threads No. 40-50 are best suited. For decorative processing, you can use contrasting threads or special threads for overlockers, but they need to be threaded only into the upper thread guide, loosening the tension.
Why does the needle constantly break when sewing an overlock stitch?
Most likely, the needle is touching the edge of the presser foot or the needle plate. This occurs if the stitch width is set too wide for the foot or if the fabric moves too far to the right. Check the needle position to the extreme left/right.
Do I need to buy a separate overlock foot?
Not required, but highly recommended. A special foot with a limiter greatly simplifies the process, making the seam even and uniform along the entire length. Without it, it is very difficult to manually maintain the distance from the edge of the fabric to the needle puncture.