Learner747

When I purchased my Bernina (new) many years ago, it would sew through 5 layers of denim. Today I tried to sew through 4 layers of cotton fabric and it would not go. The machine bogged down and the bobbin thread knotted badly. I have noticed it seems to be getting weaker. I have a Superior Needle in it and the thread is new on a cone.

Any ideas what the problem is or what I can do to fix it?
I also tried to sew a new zipper onto a fleece jacket and what a mess that was.

Thanks for your ideas and help.

Zyngawf

If you haven't had it serviced in a while, maybe it's time. When you say many years, how many? All things wear out.

Tartan

Does it have the dial that lets you adjust the foot pressure? If it dies I would increase it, if not then it might need to be serviced.

ManiacQuilter2

It helps if you post the model number. Mine is a 1530 is still running smoothly but I am overdue for getting it serviced. It is just like a car you have to have it service every 12 to 18 months. What type of thread does your manual suggest you use?? I was told to use Mettler Silk Wrapped thread.

calla

I assume you have cleaned and oiled it if that is directed in your machine manual.

Peckish

The needle may also have something to do with it. Is it dull? What size? I discovered I had to go up to a size 16 needle when I was sewing 4 layers of a denim tote.

Maureen NJ

I agree to check the size of the needle. Re thread. Put bobbin in again. Check that you have the correct presser foot on. Adjust tension and practice on a sample. My Berrnina is very finicky too. Also, Bernina has a height adjustment too that came with my machine and is helpful. Also, check in the bobbin area for a scrap of thread or excess lint. Good luck.