It is skipping stitches.
Use a brand new needle that is a suitable type for the fabric and thread you are sewing. If sewing knit, use a ball-point needle. If sewing woven fabrics, use a sharp needle (ie universal,
Use good quality sewing thread--no old or bargain bin variety.
Be sure to install the needle facing the correct direction. On most machines, the flat side of the needle faces the back of the machine, however, if the bobbin loads on the left side (not from the front), the flat side should face the throat of the machine.
There could also be a burr somewhere that is catching the thread and causing the skipped stitch.
What to Do If Your Sewing Machine Is Skipping Stitches
Basic Maintenance Tension Skipped Stitches
https://fashion-incubator.com/10_reasons_for_skipped_stitches
All About Needles SCHMETZ Needles
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SOURCE: Necchi 4575
I've found that my machine doesn't like Coats & Clark thread; I have to feed it Guterman
SOURCE: Elna machanical sewing machine
50 year old elnas made stitches by cams. look to see if the machine has a cam in it. you can see this by opening lid on top of machine. cams are black with red or white showing the pattern of the cam. could also have broken cam stack gear. That would require technician with elna experience
SOURCE: How do I do a stretch stitch?
The bes way to hem a t-shirt on a household machine is to use a double needle, straight stitch. You will see two straight stitches on top and zig zag on the back. Just make sure the zig zag catched the top of the hem.
SOURCE: I need a user manual for a Necchi Alco 2200 sewing machine
Contact the individual who posted this answer.
SOURCE: Singer sewing machine 6215c trouble
The problem is actually with the upper thread not having enough tension on it. Check your upper tension setting,,,it should be set about mid range of its adjustment (4,5 or 6). To see if the tension is functioning correctly thread the machine and raise the presser foot to its up position and pull thread thru the needle. It should pull easily, lower the presser foot down to the fabric and now the thread should become harder to pull. If there is no change in the pull,then either the thread is not in the tension correctly ot the tension is not working,
Doug
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