Hi Patricia,
Consistent thread breaks can also be the result of needles facing the wrong way and improper threading which you already mentioned and am sure you've checked and checked again. Could it also be related to the initial technical problem you had in the two weeks you mentioned?
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Are there any guides available for proper thread tension?
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You can purchase a top thread tension gauge and a bobbin case tension gauge. A gauge is a small device that allows you to have proper and consistent tension. You have to make sure to buy the right size ("M" or "L") bobbin case tension gauge that's right for your machine. They work great and come with instructions and recommended settings/guides.
For the top thread, you can do the "I" test. Basically, embroider a large (and thick) capital "I" for each needle. When embroidered, the backside of the letter should show the middle 1/3 as bobbin thread and the remaining two sides as top thread. If too much bobbin shows, the top thread tension is too tight or the bobbin tension is too loose. If too much top thread shows, then the bobbin tension is too tight or the top thread tension is too loose.
For the bobbin, you can do the yo-yo or drop test.
- Don't put the thread through the pigtail, but make sure the thread is still under the tension spring
- Grab the thread with your thumb and forefinger
- Flick your wrist down
Note: Just in case your bobbin tension is too loose, be sure it lands somewhere safe like on the palm of your other hand etc.
The bobbin case should drop 3 inches. If goes much farther, then the tension is too loose. If it doesn't budge, then it's too tight.
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My sew outs do not show much bobbin on the back.
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Your bobbin tension is too tight or your top thread is too loose.