Um, I'm thinking it may be something other than tension. If the thread is bunching up before going through the needle's eye, it would indicate to me that the thread, fabric, and needle are not compatible. Is the thread too thick for the needle eye? Is the thread unusually thick or stiff? Is the fabric heavy or unusually dense. There could be resistance to the needle and thread punching through the fabric. Perhaps trying a larger needle or even a different type needle, ie embroidery, microtex, or top stitch needle may help. A heavy, dense fabric will also present problems when the needle perforates the fabric. Be sure to use a sharp, brand new needle.
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Adjust your bobbin tension
Testimonial: "How do I adjust the bobbin tension? Book does not tell me how."
SOURCE: my needle thread keeps bunching and llooping on
If you getting loops on the bottom of your material, you need to
re-thread the top of your machine. I say this because it is very rare
when you will have to adjust the bobbin tension. But if you must,
looking straight down at the bobbin as a clock- at 6:00 is the bobbin
tension adjustment- lefty lucy, righty tighty. Hope this helps.
Make sure the needle is inserted in the machine properly- a good rule
of thumb is the flat side of the needle should go to the opposite side
of the last thread guide. Also make sure the machine is threaded
correct
There is no standard tension for any machine to be set at. They start
at four when they are brand new, however, after years and years the
springs become compressed. You could start at four and then play around
with it from there. If you are getting loops underneath the material,
you are threading the machine incorrectly.
SOURCE: the bobbin thread keeps bunching up - I have
When you are threading the machine make sure that the presser foot is up, The tension disks are open when the presser foot is up, If you thread the machine when the presser foot is down the tension disks are closed, and the thread will not go through properly causing a nest of thread of bobbin thread to bunch.
SOURCE: my singer 533 machine keeps bunching up with
Top tension about 4 or 5, make sure the bobbin turns anti clockwise, make sure you only use a mercerised thread no thicker than a number 40 and the bobbin thread should pull through with slight resistence only.
SOURCE: Jamming brand new machine
the tension on the bobbin case needs to be adjusted to needle size and type of fabric the medium fabrics usually use a size 11, light fabrics need a size 9 and heavy like ( corduroy denim or upholstery fabric needs a 14 or 16 Heavy fabrics need a little less tension on the top side so it will feed properly just play with it until it looks good on a scrap of the same fabric
SOURCE: I have a WHITE 3300 EMBROIDERY MACHINE and the
Refer to your machine for cleaning the bobbin area.
You will need to clean this area often as lint and thread snips can build up can cause the bobbin feed to malfunction.
If this continues after you have cleaned the machine, the timing may need to be adjusted by a sewing machine tech.
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