Frequent question: How do you adjust the tension on a drop bobbin?

What happens if bobbin tension is too loose?

When stitches become weak, bobbin threads show on the top or thread bunches keep happening, getting to know more about the machine will help solve the problem. … Too little tension, the thread will sag or not lay flat on the fabric because there is too much slack.

Why is my sewing machine looping underneath?

A: Looping on the underside, or back of the fabric, means the top tension is too loose compared to the bobbin tension, so the bobbin thread is pulling too much top thread underneath. By tightening the top tension, the loops will stop, but the added tension may cause breakage, especially with sensitive threads.

What should the tension be set on a Singer sewing machine?

The target figure should be around 30 to 40g. (1-1/4 to 1-1/2 oz) but it does not have to be too precise. However most people don’t have a spring balance handy, so alternatively you can tie a weight of the correct amount onto the thread and then jerk the bobbin gently upwards.

Why does my bottom thread keep bunching?

If the thread has knots, is not smooth, is uneven, or is loose on the bobbin, then it has not been threaded correctly. If your machine uses a bobbin case, follow your sewing machine’s instructions to remove the bobbin from the case and re-thread it.

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How do you tighten thread tension?

Changing Bobbin Tension

You should see a small screw on the flat/closed side of the bobbin case. Turning the screw a tiny bit counterclockwise will loosen the bobbin tension; turning it clockwise will tighten the tension.