Why do you change the tension on a sewing machine?

When should I change sewing machine tension?

When lower tension is too loose (or upper tension is too tight), knot is visible on right side (left). When upper tension is too loose (or lower tension is too tight), knot is visible on wrong side (right). Tensions can still need adjustment even if they’re balanced.

What should the tension be set at 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 is my thread bunching 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.

How do you fix bobbin tension?

Bobbin tension or bottom tension is fixed by adjusting a small screw next to your bobbin case’s thread opening.To adjust, use a tiny screwdriver and turn the tiny screw to the right for tighter tension or the left to loosen bobbin tension.

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What tension should I use for thin cotton?

Use size 70/10 for really thin cotton like voile, size 80/12 for light to medium weight cotton, and 90/14 for thick cotton like denim.