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Typically, when there are loops on the bottom of the fabric, there is something missed in the upper threading. Make sure when threading:
- the presser foot is in the up position to open the tension disks
- make sure the thread is well "seated" in the tension disks before continuing to the take up bar.
- using the manual follow the thread path carefully
- check to make sure the thread flows smoothly from the spool
- use the correct size spool caps to help the thread flow easily
Problem with Brother CS-8150 Computerized Sewing Machine
bottom thread from theh bobbin is in big loops.
I have a CS-8150 as well -it was fine until I decided to clean the shuttlecock and I thought I had put it back correctly. However, it was after replacing the shuttlecock in place that my bobbin thread was making big loops and no matter what tension it kept doing it. So I removed everything out of the bobbin area. Cleaned and made sure that the shuttlecock was exactly in place as per the manual. Guess what it does not make big loops any more. Just a suggestion.
If the thread is looping underneath, you're top tension may be too loose or the thread may not be in the take-up lever. If it's looping on top, double check that the thread is in the bobbin tension or that the bobbin tension isn't too loose.
Try rethreading the top of the machine making sure you get it thru the tension wheel correctly.. General rule of thumb.
If it loops on the bottom, the problem in on the top.. Loops on the top, problem is with the bobbin.
Here are some things to try:
Big loops are actually easier to solve usually. 1st know this: Loops on bottom means the top is too loose or the bottom is too tight. With loops that big its probably the top is too loose. 1st look in tension disks, there is likely a chunk of thread in there. A toothpick is handy to dig it out (the flat kind) 2nd make sure that the thread is getting between the disks when threaded. 3rd Make sure the thread is in the take up lever (the thing that moves up and down in front and not the needle bar or any part of the needle bar.) If neither, then the bobbin case could have a burr on it and the thread is hanging on that burr. Also the bobbin case may be in wrong. I hope this helps
If the thread is loose on the bottom of the fabric, it's actually the top thread is too loose. Think of 2 little elves playing tug of war in your machine, one on top and one underneath. If you have loops on bottom, the top needs to pull harder (tighten top tension
Test your thread quality to start, thread your machine and LIFT the presser foot (this opens the tension disks). Pull your top thread straight back. If you feel no tension no matter how much thread you pull, your thread is good. If that your machine passes that test, we can go to step 2. If not, try different spool of thread, do the same test until you get a smooth pull (tip: always check your thread this way when you thread your machine)
Pull on your threaded bobbin thread while it’s in the machine. Does it pull smooth and even? If so, go to step 3. If not, try a new bobbin (bobbins get bent or distorted if wound too tight).
Clean thoroughly in the hook and bobbin case area and oil 1-2 drop is all.
Sorry I missed your problem, I have just signed up on here to help with problems like yours.
Thread looping underneath the cloth is a bobbin tension problem.
Folks in general are not aware that in addition to the top tension being set correctly so must the bobbin tension.
It is impossible to explain how to do this you need to be shown. However it should be explained how to do it in your manual.