How can I avoid the raised area between stitching lines when sewing with a double needle? A friend suggested using a stabilizer underneath, but this isn't the best solution on long seams or hems. Mary Jo S.,
e-mail
A twin or double needle produces two parallel rows of stitching on the upper side and a zigzag stitch underneath. It's great for topstitching and hemming knits-the wide stitch prevents the hem from rolling and the zigzag has built-in stretch. A ridge can form between the rows, especially on sheer fabrics, if the bobbin tension is too tight.
Twin needles come in different widths and are labeled with two numbers. The first number is the space between the needles, in millimeters, and the second number is the needle size. Always test the needle's movement by slowly turning the hand wheel. Make sure it doesn't hit the throatplate and you don't hear noises from the needle rubbing against something in the bobbin area.
To adjust the tension to avoid the ridges, first be sure the machine is threaded correctly. Thread the needles from separate spools of thread (or a bobbin and a spool placed on one spool pin), with the thread unwinding in opposite directions to prevent tangling as they feed through the machine. At the upper tension disk, place one thread on one side of the disk and the remaining thread on the other side. If the machine has a thread guide above the needle that separates the threads, use it. If your machine doesn't have a separating guide, place one thread through the guide and leave the other free.
Next, loosen the upper tension and test the stitching. If a ridge forms, loosen the bobbin tension slightly and test again. If a ridge still forms, a stabilizer underneath is probably the best remedy.
This information was current when published in the November 2003 issue of Sew News. No guarantee is made regarding availability. Stay up-to-date with current sources by subscribing today!
