Thread is not the same on top and bottom. I need to know which size needle to use, threat tension, and stitch length.
For spandex you will probably want to use a size 70 needle for stretch fabric. You should be able to leave your tension settings on standard tension but may need to go for a slightly shorter stitch length.
try stitch length of 2.5 or 3
tension of 3.5
check your bobbin tension, to do this thread the bobbin and suspend it in the air holding the thread. If the bobbin falls to the floor the tension is too loose. If the bobbin hangs in the air and you give a gentle tug on the string the bobbin should slide along the thread an inch or so. If it doesn't budge it's too tight.
When you say the thread is not the same on top as the bottom do you mean you are using different threads or that the stitches are coming out different on the top to the bottom of the fabric?
SOURCE: my top stitch is flat, but the bobbin is bunching
What looks like a bobbin problem is sometimes the threading of the top thread.
If you threaded the machine with the presser foot down, the tension is closed and the thread cannot enter as it should.
Improper seating of the thread into the tension results in loopy stitching as the thread is not being guided at the proper tension to create a satisfactory stitch.
Try re-threading the machine with the presser foot up.
SOURCE: i have an 1130 bernina
The 1130 does not have a consumer adjustable presser foot. Check to be sure you are using the correct presser foot .Some feet are slightly different in height which is how the pressure is regulated. If this is not your problem it will need to be seen by a technician.
sewman7
SOURCE: my sewing machine was working fine until I changed
So is the stitch length now back on 2.5 for a normal straight stitch?
Or have you perhaps put it into a buttonhole sequence or something where it is sewing in the same spot.
Or have the feed dogs been disengaged accidentally, this would also mean no forward motion during stitching. Can you run it slowly, no thread, no presser foot and see if the feed dogs are going through their normal up and backwards movement to check this?
Have you got the manual to trouble shoot and find how to renegage the feed dogs if this is the cause. Sometimes it is a slide mechanicsm on the free arm or at the back of the main sewing area.
SOURCE: Thread tension problem when sewing on heavy fabrics
If you are using buttonhole twist or heavy topstitch and normal thread underneath machine tensions wont like it. Try using regular thread top and bottom but use two same colour on top and thread both through needle but put one either side of tension discs if you can. Top stitching jeans is problematic for manymachines even Berninas
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