I have been having the same trouble--I took this in to a shop and was told it would cost $80 to repair with no warranty on the repair since the machine is all plastic. I think my bobbin tension is too tight but there is not a separate bobbin case, just a plastic space to drop it in.
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Re: looped bottom thread
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.
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try these suggestions new needle check to make sure that the top thread has not come off the thread take up lever make sure the bobbin is turned the right way in the bobbin case the machine could have a timing problem I suggest taking the machine tp a different repair shop next time, when you take the machine in 5 times and it's got the same problem, it's time for a different repair shop..
have you tried changing the needle? have you tried adjusting the top thread tension? it might be the needle and the thread are not compatable,, the needle may be to light for the thread. if the suggestions don't help, sew on the sewing machine till it makes the loop and then stop the machine and take it to the repair man and let him see the loop and then ask him why it's making the loop.
Your description isn't very clear. When you say the "bottom stitch is using too much thread" Do you mean you see lots of loopy threads on top of the seam? Or do you mean you see loops on the bottom under the fabric? If your loops on the bottom, that means the top tension is too loose, you've not remembered to put the presser foot down, you have not threaded the top thread properly... Start by rethreading carefully with the presser foot UP. Then do a test stitch, remembering to put the presser foot down. If you still get loops underneath... tighten the tension.
If your loops are on the top of the fabric. loosen the top tension... then do a test seam... and if you still have loops loosen again and repeat. If you start to see loops on the bottom... tighten the tension a bit.
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.
Dear VeeVeeV, when I've had that problem it was due to incorrect threading of the top thread. Sometimes it "jumps" out of one of the thread guides, particularly the round one with the tension spring. The bottom thread looping & the machine not sewing is my first clue sometimes that it's done that. good luck, Georgia
i have started using my machine again (after several years) and am
doing patchwork.. all has been fine, and suddenly the bottom thread
(bobbin) is looping. i've adjusted the tension nob from 4 (where i had
it) to 5...back to 4.. 41/2....3 1/2....5 1/2... on and on and the
bottom thread still keeps looping.
i've read and re-read the manual...and the only suggestion it gives is to adjust the tension button.
it's not working...... what else can i try??
Proper set of bobbins and tension set up vs. fabrics will sew you satified.Also incude regular maintenance cleaning of the feeds dogs with a brus,also the shuttle assembly need sometime to clean.Some threads and fabrics chips accumulates in the feed dogs and shuttles assembly.In setting up thread bobbins the thread should be clockwise direction as you pull out on slot coming out to the bobbins (as you shown in my inserted image manual).The loop thread should be propely in the sequence position same like in the image refer to it.If you use cotton/ polyester fabric in the begining of trial set tension dial to No.3 and stich to No. 8 to 12 any convenient to you Use needle No. 14 .Posible make a record if you are sewing different types of fabric mostly silk fabric is hard to sew adjusting to lower stich can posible sew satisfactory.
Looping on bottom:
Great description, that helps a lot. 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