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If you do an internet search for "necchi 3205 threading" As an 'image', you will find many images with either the 3205 or other similar Necchi machines. I tried to upload an image to show you, but was unable to get it uploaded. But you will have no problem finding a detailed image online either of the 3205 or one that is very similar.
it is called bird nesting and is the result of the needle thread tension being too low
recheck that the thread is between the tension plates and not behind them
or disregard the settings and set ti manually
as if you are going to thread the needle , pull the thread and there should be a reasonable amount of effort needed to pull the thread
If there is not resistance to the pull then the tensioner is not applying the necessary tension
Even if not your particular model, basic machine threading is very similar from one to another. Just be sure to ALWAYS RAISE the presser foot when threading the top thread---and change the needle often.
You would need to adjust the tension screw so the tension is looser than usual. However, remember to mark the setting BEFORE making any adjustments so you will know where to return the original setting.
Be sure the machine is threaded properly. Also, the presser foot MUST be raised before threading so the thread will seat properly in the tension disk.
The standard setting for the upper tension is the midway point between the high and low number.
If the bobbin thread is still way too loose, you can try adjusting (tightening) the bobbin case tension. If that does not fix the problem, you can probably try purchasing a new bobbin case for your machine as the old one may be broken or worn.
It may not have seized there may be a very small piece of thread jammed in the raceway area, you need to take the bobbin case and the raceway out to check
try a tension setting of 3 or 4
my mechanical necchi is set on 4, but the tension should be adjusted according to the fabric & thread & needle
here's a tip for needle & thread compatibility
Cut 6-8 inch piece of thread of the spool you are going to use for your project
Take the needle you are going to use for the project
& insert the thread thru the eye of the needle
& lift one end of the thread to a 45 degree angle
& if the needle is the right size for the thread it will slide down the thread
But if the needle hangs on the thread you need one size larger needle for the thread
Before the thread goes though the uptake lever, it goes though the tension (a round "knob" with numbers).
When threading the machine, lift the presser foot. This opens the tension control so the thread can enter and then when the foot is down and you begin to sew, the tension setting will determine how much thread should feed to the needle.
The setting is usually around 4. However, if this is an older machine that has been used a lot and serviced a little, the tension may not work as it should.
Try different settings and if you cannot get a proper stitch, you will need to determine if the machine should be serviced or if you should purchase a new one - service and parts can be 1/2 the price of a decent, new machine.
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all machines thread the same. TTN tension,take up,needle.
Beginning with the spool, guide the
thread through the thread guides to the tension assembly. Pull the thread
through the tension assembly and test it to make sure the tension is working
correctly.
(To do this test, adjust your tension setting to normal or medium or 5 or
something in the middle. Raise the presser foot and pull the thread through the
tension. It should pull easily!! Lower the presser foot and pull the thread. It
should pull noticeably harder.) If it passes this test, continue up through the
take up lever,then down through the thread guides to the needle. Make sure your
needle is fully inserted and turned the correct way.FLAT to the BACK.
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