How to Fix Thread Tension on a Juki DDL-8700

はじめに

This guide will fix the thread tension on a Juki DDL-8700 lockstitch industrial sewing machine.

When working on sewing projects, you often change the fabric and threads that you use. With this, the sewing machine tension must be adjusted before sewing. Without proper thread tension, loops and bundles of thread (bird nests) can be created, rendering the sewing machine almost unusable.

This guide will demonstrate how to fix thread tension issues, returning the machine to working order.

必要な工具と部品

手順1 How to Fix Thread Tension on a Juki DDL-8700

How to Fix Thread Tension on a Juki DDL-8700, How to Fix Thread Tension on a Juki DDL-8700: 手順 1、 3の画像 1

How to Fix Thread Tension on a Juki DDL-8700, How to Fix Thread Tension on a Juki DDL-8700: 手順 1、 3の画像 2

How to Fix Thread Tension on a Juki DDL-8700, How to Fix Thread Tension on a Juki DDL-8700: 手順 1、 3の画像 3

Thread the machine.
Insert the bobbin case.

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手順2

How to Fix Thread Tension on a Juki DDL-8700: 手順 2、 3の画像 3

Sew a straight line on scrap fabric to test thread tension.
Be cautious when placing your fingers near the needle when working with the machine turned on.

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手順3

Check the fabric for loose thread tension.
Look out for loops of thread on the top and bottom of the fabric.
The bobbin case tension is too loose if loops are on the top of the fabric.
The upper thread tension is too loose if the loops are on the bottom of the fabric.

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手順4

Take out the bobbin case.

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手順5

How to Fix Thread Tension on a Juki DDL-8700: 手順 5、 3の画像 3

Create a baseline thread tension for the bobbin case by tightening or loosening the screw on the bobbin case.
Thread should not easily unravel but can be pulled loosely.

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手順6

Reinsert the bobbin case into the machine.

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手順7

How to Fix Thread Tension on a Juki DDL-8700: 手順 7、 3の画像 3

Sew another straight line on the scrap fabric next to the previous line.

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手順8

How to Fix Thread Tension on a Juki DDL-8700: 手順 8、 3の画像 3

Check the front and back thread tension of the scrap fabric for loose stitches.

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手順9

How to Fix Thread Tension on a Juki DDL-8700: 手順 9、 3の画像 3

Adjust the upper thread tension.
If there are loose stitches on the top of the fabric, loosen the upper thread tension by turning the tension knob counterclockwise.
If there are loose stitches on the bottom of the fabric, tighten the upper thread tension by turning the tension knob clockwise.

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手順10

How to Fix Thread Tension on a Juki DDL-8700: 手順 10、 3の画像 3

Check the thread tension by sewing another straight line on the scrap fabric next to the previous line.

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手順11

How to Fix Thread Tension on a Juki DDL-8700: 手順 11、 3の画像 3

Check the front and back thread tension of the scrap fabric for loose stitches.
The thread tension is correct if there are no loose stitches.
Repeat steps 5-8 as needed to achieve a consistent thread tension without loops on top or bottom of scrap fabric.