Unless the machine timing is off, the most common resolutions for skipped stitches:
Install a brand new needle.
Be sure the needle, thread, and fabric are compatible, ie do not use a ball point needle on woven fabric.
Rethread the machine and verify the thread path is correct.
AVOID old or bargain bin thread.
Basic Maintenance Tension Skipped Stitches
Sounds like the timing is off and will need a service call to get it reset. your local fabric store should know who you can call.
SOURCE: zig zag stitches are not holding
When ever a machine is jamming up the bobbin thread, it is a result of your top tension. It is either set to low (under 4), or the thread has come out of the take-up lever. Check your threading, fromt he spool pin, down to 2 and up to 3. Three is the take up lever. From the take-up lever down to 4. Set the thread behind the thread guide and thread the needle form front to back. Low quailtu thread 9dual duty or all purpose) can also create this problem.
thanks,
Bonnie
SOURCE: The bobbin thread is bunching on the under side of
Make sure that you use the F foot when using decorative stitches.
The stitch balance my be off. Remove the accessory bin and you will see a large plastic screw with a + and a - and an arrow. Using a coin, turn the arrow to the center and test. Turn the arrow towards the + to stretch the pattern out.
If this doesn't work, it must me calibrated internally and requires an experience hand.
SOURCE: zig zag stitch is skipping sporatically
Check the timing of the needle to the hook.
Here is a guide to generic principles of Timing
SOURCE: Shirring fabric?
When putting your shirring elastic on the bobbin, don't thread the elastic through the bobbin holder,adjust the stitch length longer,and loosen the tension, other wise if you want to put it through the bobbin holder you have to loosen the tension screw on the bobbin holder, and then you have to adjust it back for ordinary sewing,
SOURCE: The machine is not stitching
If the bobbin thread is coming up to the top, then the thread is not under tension correctly. I think that this is a top loading bobbin so the bobbin will go into the bobbin holder, then you pull the thread back and press it into a tension device - should hear it click into tension. Now pull the thread back towards you and it should not come out of the tension. The bobbin should turn anticlockwise as the thread is pulled from it.
These bobbin holders usually will have a small adjustment dial on them and it should have the standard setting marked in red. It is very unusual that you would need to change this but check that it hasn't been messed with perhaps. If you have the machine manual check where they say the dial should be set. More likely that the thread is just not into tension fully or at all.
The manual may give you other troubleshooting tips too.
A good resouce is www.sewing.about.com for general machine tips, cleaning and threading issues.
Hope this helps.
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