BUTTON HOLE IS NOT UNIFORM ON BOTH SIDES. iS THIS A TENSION PROBLEM

To do the basic rectangular button hole, make sure that you have plenty of thread in your bobbin. Put on the button hole foot. Mark your fabric before starting for the button hole locations. Testing the button hole on an extra piece of your fabric is useful for checking the tension balance. Next place your fabric under the presser foot and center the right side of the button hole position with the red alignment marks on the foot. Set the stitch to button hole stitch 1. Turn the hand wheel to bring the needle into the fabric at the point in the center of the needle opening of the presser foot. Stitch to the end of the planned button hole. Use the hand wheel to bring the needle out of the fabric and turn the stitch selector to the button hole stitch 2. Make at least 4 stitches and stop with the needle to the left side of the bottom of the button hole. Raise the needle and set the stitch selector to button hole stitch 3. Stitch back to the top of the button hole. Raise the needle and set the stitch selector to button hole stitch 4. Stitch at least 4 stitches. Raise the needle and the presser foot and remove the fabric. You can move to the next button hole or carefully cut the button hole opening.

The manual gives the directions for the 4-step button hole on page 28-29 (pages 30-31 of the PDF). Many Singer manuals are available here: https://www.singer.com/support . Singer has two manuals for the 6212. (One manual covers two machines; the other covers 7.) The manual to the first manual is currently here: https://res.cloudinary.com/singer-sewing/image/upload/fl_attachment/Singer-Website-Library/outdated_product/SINGER_6202_and_6212_Sewing_Machines.pdf .

I hope this helps.

Cindy Wells

Generally I believe that the sub tension regulates the length of the tail left after the machine cuts. Rather than adjust the sub tension, I would 'slightly' tighten the screw on the bobbin case and see if that solves the problem. If you were not having the problem before, there may be lint or tiny piece of fuzz under the spring on the bobbin case or a piece of thread hung up in your upper tension. Good Luck!

try changing the needle

Usually thread too loose on the bottom is caused by the upper tension being too loose. The top and bottom tensions work together with the top thread making the underside of the stitch seem too taunt or too loose and the bobbin thread causing the top side of the stitch to be loopy or too tight. Select a large zig zag stick and sew a couple of inches. Then examine the stitch. It should look identical on both sides. Look to see which side is drawn too tight, the zig zag being smaller on that side with threads from the bottom threads pulled through. Then adjust the two tensions so that they make a uniform, identical stitch.

Also, when the bobbin tension is right you can hold the bobbin dangling by the thread and it won't spool out to the floor but will let loose a bit with a slight flick of the wrist. Too loose it will just spool out. Too tight and it won't drop at all. When you get that set right then do the above zig zag test to see where the top tension should be set.

Any quality sewing thread - Coats & Clarks is the most readily available.

Never use hand quilting thread or button thread as it is glazed and that is not good for the tension mechanism.

You can use machine embroidery thread for the decorative stitches. Base a tear away stabilizer under the area you will be stitching. This will help keep the fabric from distorting and the stitches uniform.

Test all the features before applying to a project.

sometimes when you reset the top tension dont forget to reset the bobbin tension so try to tighten the bobbin tension

Slightly reduce upper thread tension. Good Luck

Try adjusting the tension a bit. Make a not of where it was origonally set.

On my machine I find that my bottom and top free motion stitches are more uniform when I set my needle thread tension at 8 or 9. This is inaddition to what you are already doing. Also, you might want to use a top stitch needle.

Good luck,
SewReady

Make sure you have pull down the arm that will engage the button hole mechaizm. Put a button in the back of you button hole foot, attach foot, reach up on the left side just below the light and pull the lever down, choose the button hole , lower tension to 3 and sew out the button hole. The button hole foot should push on the arm when it gets to the end and complete the rest of the button hole. If the columns do not match then it has to be serviced by a husqvarna dealer.
Sew Technologist