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Tip: A general rule of thumb is that if the stitch looks bad on the top it is the
bottom tension. If the stitch looks bad on the bottom is the upper tension. The upper
and lower threads play tug of war with each other.
How Do I Make Adjustments to Make the Perfect Stitch?
Understanding how your long arm machine makes a stitch will help you make the proper adjustments to make
the perfect stitch. The technique all long arm machines use to make a stitch is basically opposite of the home
sewing machine. The home sewing machine is designed to press together two layers of fabric and sew while
the fabric is held in place by the presser foot. Long arm machines are designed to press and sew multiple layers
together while the machine head is moving. The difference is that there is practically no needle deflection on a
standard sewing machine and a large amount of needle deflection on the long arm. The higher the tension, the
more the needle will deflect. Another cause for the needle to deflect on a standard machine is the type of fabric
being sewn. A tightly woven fabric tends to force the needle in different directions as it penetrates the fabric.
This type of deflection depends greatly on the type of needle and type of point you use, such as a ball point or
sharp point.
Needle deflection, what is needle deflection? What causes needle deflection? How is needle deflection
related to the stitches on my quilt?
On a long arm quilting machine a stitch is mechanically created the same as a home sewing machine except the
quilter is the feed dog moving the machine head over the fabric. The hopping foot presses the fabric together
tighter and quicker than a home sewing machine presser foot because the fabric must be able to slide between
the foot and the needle plate as the machine is sewing. This means that the machine is moving while the needle
is in the fabric. The worst thing for a needle is to be in the fabric while the machine is moving which bends the
needle, creating needle deflection.
Good stitches will interlock in the batting between the quilt top and backing. In real life, this goal is rarely
achieved. For this reason, you need to be aware that you will have “pokies” if you use different colors of thread
on top and in the bobbin. Pokies are where you can see tiny dots of the contrasting thread where the bobbin
catches the top thread. If there is slightly more tension on the top than on the bottom, then you will see the
pokies on the top side of the quilt. If the greater tension is on the bobbin, then you will see the pokies on the
back of the quilt. If the pokies are objectionable to you, use the same color thread on both top and bottom.
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