Top Tension

The quality of the stitch is dependent on the tension of the thread. A quilting machine has two thread sources, both of which have their own setting. These tensions are often referred to as the "Top" tension, and "Bottom" tension. The first step to ensure correct tension is to review your bottom case, or bobbin tension. Once this is set correctly, it becomes the baseline to which the "Top" tension will be set.

Top Thread Tension...
Once you have adjusted the Bobbin tension, you have now eliminated one tension problem. Now we only have to adjust the top tensions...

The top tension (white knob) is a fine tune adjustment. Turn this knob at least a half to a full turn in order to make a difference on the tension.

The intermittent tension (black knob) is a stronger tension, and will affect the top tension more dramatically.

The top tension is a balance between the top and intermittent tensions.

For an easy reference point by which to re-balance your tensions do the following:

Sew with your machine and adjust the tensions so that they give you a balanced stitch.

Look at the pictures "Example 1" and "Example 2." If the tension knobs look like the knobs in the example pictures when a balanced stitch has been achieved, then stretch the top and/or intermittent tension cone springs until the knob is flush with the end of the shaft (as seen in the "normal tension" pictures).

Conversely, if the knobs are out from the shaft then collapse the cone spring.

The "normal tension" should be when the face of the knob is flush with the end of the shaft.

Keep in mind that on a quilting machine, every direction that we sew changes the bobbin tension because it is pulled out of the bobbin at different angles. If you use contrasting thread (red on top and white on bobbin) you will see migrating dots as you sew loops the size of a quarter (see the picture on the right).Remember! Be sure you have a good bobbin tension before you attempt to fix these top tension knobs!