ManiacQuilter2

Is this at the beginning of when you start to stitch?? If it happening in the middle of piecing. I would take it as is to your dealer so the technician can actually see what has happen. Leave the piecing in the machine. If it is at the beginning of your stitching, it happens occasionally on my Bernina. That is why I use a scrap of fabric called a ender so that prevent the problem. Or you have to hold your bobbin thread at the beginning. Hope you are able to resolve this problem.

Onebyone

Are you threading through all the holes in the top bar? You don't use both holes for regular sewing thread. Use just one hole for guide. I would certainly take the machine back with a sample of the sewing in hand and sit and sew until it happens again. Nothing is more frustrating then a sewing machine that won't sew right.

Barb in Louisiana

I don't have a Juki, but I do have a Brother that has experienced the same problems. It has had the ping from every problem mentioned by all the others and from the bobbin not being the right one for my machine. The 15 and type L bobbins look similar but are very slightly different sizes in height. It would sew okay for a while then hang up, loop the upper thread, then pop. Very hard to see or find and wouldn't do it for the tech. My husband noticed that the bobbins weren't the same height while in the bobbin case. Thank goodness.

Onebyone

One thing I learned is to always use the right size bobbins for the machine. Bobbins may look the same but they are not. The tech didn't know to check if the right bobbin was used? If that is the problem the dealer needs a new tech.

Kimarene

Thank you, everyone! So much good information on this board, it's amazing.

Interesting about the bobbin possibly being the problem. Hadn't thought of that. I've re-threaded the machine step by step from the instructions, changed my needle, and have been fiddling with the top tension. It's not an easy adjustment and I'm not sure I've got it right. I can turn the top thread tension knob round and round, and it doesn't seem to change the tension that much. Now I'm not sure I've got that set right.

I guess I'm going to have to take it in. Thanks again, everyone, for your insights and suggestions.

kiangel16

the only thing I can say is the machine don't have a year yet take it to the dealer and let them know you want a new one. The reason is that you already being there 3 time with the same problem and they haven't fix it. They are probably waiting for the year to come by so they can tell you sorry but there nothing we can do now because is been more than a year. I know this because happen to me few year back with a sewing machine. Also you can contact the juki company and let them know the problem to see if they can help you. Good luck.

Onebyone

Be sure your foot is up when you change tension. If it is down it won't change.

Peckish

I was going to suggest this also.

citruscountyquilter

It is so frustrating when things don't happen all the time so when it happens at home and you take it in and it sews fine...grrrr. I was having a problem with skipped stitches on my new machine. I rethreaded, changed the thread, changed the needle, changed the bobbin etc. I finally found out it was the fabric. I had bought 4 pieces of batik in different colors and the blue one was causing the problem. I changed the tension and got it to work.

One thing that hasn't been mentioned so far is are you sure you have your needle in right. There is a front and back to a needle. Most needle manufacturers put a flat side on the shank of the needle. That flat side needs to be on the side of the needle where the thread comes out. So in other words if your machine threads from front to back the flat side of the needle shank needs to be on the back. If the needle is in backwards the machine generally will still sew but will have skipped stitches, uneven stitches etc. I had a friend recently who had purchased a Featherweight and couldn't get it to sew right and wanted me to look at it. I noticed that she had put the needle in so it threaded from front to back. On a Featherweight the needle threads from right to left. Once I repositioned the needle it sewed like a dream.

I would keep track and samples of what you are experiencing. I would also take pictures of how the machine is threaded, the tension etc for reference. I would also systematically go through and change one thing at a time such as the needle, the bobbin, the thread etc to see if there is any impact.

Ellageo

may seem 'wrong', but go buy top of the line thread, maybe a spool o f white, use it in the bobbin & on top, then see what happens. I know you think it's getting caught on something IN the machine, but just try this.