My 385 bobbin thread bunches up back side of material and when I try to disloge the thread it will not pass thru the opening. I remove the bobbin case and notice the thread is outside the bobbin not running thru the little opening . i have tryed tighting the thread gage and no good. I noticed a little rust inside the case and tryed removing that and no help. I am using plastice bobbins. I some times have every thing running smooth and this all of a sudden happens mid seam.
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Re: model 385 bobbin thread problems
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Please do the tension assembly test as described.
Tension assembly test. To do this test. Pull the thread
through the tension assembly and test it to make sure the tension is working
(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 doesn’t work this way then you probably have a piece
of thread or lint stuck inside the tension discs. To remove it, turn the
tension to 0 zero and raise the presser foot.Using a small screwdriver, open
the space between the discs and spray with canned or compressed air. The stuff
should come out. Do the tension test again to make sure you got everything and
then try sewing again. The bobbin should be inserted so that when you pull on the bobbin thread the bobbin turns to the left. If it turns to the right it is upside down and the thread will come out of it. This should solve your problem unless there are scratches on your bobbin case. Check by removing the bobbin case and visually inspecting it for any groves or scratches. If you find any remove them with an emery stick and then polish it with fine steel wool. Be sure and use a new needle when you start sewing again. sewman7
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This sounds a lot like you've forgotten to lower the presser foot. (this leaves the tension discs open and causes serious issues below the material.) Double check that and if still having issues post again.
You are probably threading the machine incorrectly. Re-thread the machine very carefully as per your instruction manual.
If the problrm persists then You have a thread tension adjustment problem here
There is a tension adjustment knob this is usually located at a point in the thread's travel approximately half way down the sewing machine's head and the point where the thread is looped into a "tension spring"
It is at that point that you need to do your adjustment,tighten it slightly and make a pass of some trash cloth through the machine,if the thread's knotting up has improved adjust a little more test again until the proper tension is set
It should be fairly evident once you start this process if the tension needs to be slightly tighter or slightly looser you may even have to "tweak" this setting slightly once you have the actual project material into it's run because the type of material and the thickness of the needle's pass will have a lot to do with the necessary tension setting.The thread should "lock" at the back side of the material passing thru the machine to have the proper tension setting
At some point in the threads travels to the needle,there is a tension adjustment knob--- this is usually located at a point in the thread's travel approximately half way down the sewing machine's head and the point where the thread is looped into a "tension spring" ---- it is at that point that you need to do your adjustment----- tighten it slightly and make a pass of some trash cloth thru the machine--- if the thread's knotting up has improved--- adjust a little more--- test again until the proper tension is set !!! It should be fairly evident once you start this process if the tension needs to be slightly tighter or slightly looser--- you may even have to "tweak" this setting slightly once you have the actual project material into it's run--- because the type of material and the thickness of the needle's pass will have a lot to do with the necessary tension setting--- the thread should "lock" at the back side of the material passing thru the machine to have the proper tension setting !!!
try these suggestions
1.check to see if your needle is bent-place needle on flat surface & see if it rolls good
2.if needle make poping sound when going thru fabric it is blunt
3.check to make sure the bobbin is not warped
4.make sure there no loose thread or lint in bobbin area
5.make sure there are no burrs on bobbin or bobbin case
6.check to make the thread does not come off the thread take-up lever
I found that if the bobbin is not threaded correctly or if the upper thread is not adjusted properly, it will bunch on the bottom. Also, if the stabilizer is not firm enough for the material it will bunch.
It is the dial to the right of the take up arm on top. If you go all the way to 10 and nothing happens then you'll need to take it to your nearest technician or Bernina dealership. Also its possible you may have put your bobbin in the bobbincase the wrong way. After putting the bobbin in the case and pulling the thread the bobbin should turn clockwise.
I have a Singer 2950. The thread keeps getting bunched up on the reserve side of the fabric, and does not stitch. It is driving me crazy. I think I have the bobbin threaded correctly, as well as the machine. I have tried everything! Please help!