Question about Brother SE-270D Computerized Sewing Machine

3 Answers

Loose bobbin tension

I have had my machine for over 12 months, with no problems. Suddenly the bootom tension is very loose. I have tried everything recommended to fix this and even tried tightening the bobbin case tension, but it is already at its tightest! I have tried adjusting the top tension but even at its lowest its still not balanced. I do not sew for a hobby I sew for a living and I cannot sew professionally with this tenion issue. please help!

Posted by Anonymous on

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  • Brother Master
  • 9,254 Answers

Do you ALWAYS RAISE the presser foot when threading the top thread? Try that. It is a very common problem with a very simple fix.

Usually, if a thread problem presents itself under the fabric, it is a top thread issue. If the thread problem appears on the top of the fabric, it is a bobbin thread issue.

NOTE: you may need to undo all the tension adjustments you have made to your machine.

Posted on Jul 07, 2017

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  • Expert
  • 59 Answers

When you say the bottom tension do you mean the thread on the bottom? The thread on the bottom of fabric is actually the top tension. If it is loose then turn the dial to a higher number. Turn at small increments each time.
If the thread on the top is loose it is the bobbin thread tension. The bobbin thread tension rarely needs to be adjusted. If you have tightened it up that much it probably needs adjustment now.
Start by adjusting the top tension a little and do a test. Do this until the stitches are no longer loose. Check to make sure you have the machine threaded correctly and the thread is between the tension discs.

Posted on Jul 06, 2017

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  • Brother Master
  • 42,092 Answers

The bobbin tension is set by that small spring plate that you pull the thread under after you put the bobbin back in the carrier / holder
a very small turn of that screw makes a big difference ob the tension unlike the needle thread tension
mostly the problem ( you never bothered to mention the symptom ) is bird nesting under the fabric which is the needle thread tension not tight enough

Posted on Jul 06, 2017

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Posted on Jan 02, 2017

  • 2 Answers

SOURCE: Brother Industrial Machine Tension

This is an answer to another person with a similar complaint. Try the suggestion below, it may fix the problem.

From your description it appears that you have tried tension settings on the upper tension control adjustment knob without success.
Check that the bobin tension is adjusted correctly by taking out the bobin complete with the spool.
Pull the cotton thread and it should be a smooth light pressure if the tension is correct. If it is tight to pull or pulls freely then adjust the tension screw which is found on the outside of the bobbin. The screw is very small and requires a minature size screwdriver. The adjustment will only be a slight turn of the screw one way or the other to obtain the correct tension(depending if it was loose or tight).
Once this is set reinstall the bobin and tread up the machine, hopefully with the upper tension set at approx."2" the machine will sew correctly.

Posted on Nov 30, 2008

Mimito7
  • 128 Answers

SOURCE: loose bottom stitch on brother se 350

Hi, general rule of thumb:: loops on the top, problem on the bottom.. Loops on the bottom, problem is on the top.. When threading your machine, stop just before you thread your needle, put the presser foot down. Try pulling the thread. If it pulls easily, the thread is not thru the tension wheel right. If it pulls hard, you got it right.

Posted on May 12, 2009

  • 1 Answer

SOURCE: Sewing machine bobbin thread issues

i dont found the bobine

Posted on Nov 22, 2009

  • 96 Answers

SOURCE: My bobbin thread keeps getting tangled and

there is a screw on the side of the bobbin case, which needs to be turned to the left or counter clockwise to loosen the tension and also change the needle because a burr on the end will cause problems with bobbin thread

Posted on Dec 13, 2009

  • 1788 Answers

SOURCE: My brother LS-1520 sewing machine is having major tension problem

Try some metal bobbins, #15 or SA 156. that seems to help. If, you don't have a manual go to brother.com and download one for free

Posted on Jul 27, 2010

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1 Answer

Top tension suddenly loose in embroidery. Have rethreaded x 10


Make sure the bobbin case is seated properly without turning around. If you look there is a lever that holds it down on the left side. On the right side you will notice a holder that can be adjusted to tighten or loosen the movement of the bobbin. Leave a small amount of movement though because thread has to slide between areas.
The adjustment of the top tension is normal at four. Try to take a slight pull on this and pay attention to the feel of the pull. This is the amount of pull that the bobbin case should have the tension set. It is similar to a tug of war. The objective is to set the top and bottom tensions equally.

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it indicates that you have a situation called " bird nesting" and that is a result of the needle thread tension being too loose
needle tension should be tight so that when you pull the thread to thread the needle you have to exert a bit of effort to pull the thread through the tension plates
you can adjust up or down from that feeling
thread thickness affects the tension and needle eye size also affects the tension as a small eye on large thread makes the thread movement hard indicating less tension or a big eye on a small thread affects the tension as the thread slips easily and needs more tension to pull the bobbin thread up to the centre of the material being sewn

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Set the top tension as recommended by the mfg - this is usually between 3 - 6.

Now re-thread the machine with the presser foot up and see if this doesn't eliminated the loopy stitches.

What appears to be an issue with the bobbin may actually be the top thread was not seated into the tension during threading and the tension cannot control the flow of thread to the needle and you get a loopy stitch.

Keep the bobbin case clean as built-up lint can cause stitching problems.

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1 Answer

Sewing a straight seam will be going well until the bottom thread suddenly becomes very loose and loopy. The top thread is completely fine. The only clue that this is happening is the spool "jumping"...


Hello,
Here are some solutions to try.

* Increase the upper thread tension on your machine. It may be too loose.

* Decrease your bobbin tension if your sewing machine allows you to adjust it. Consult your manual.

* Reinsert your bobbin. It may be inserted incorrectly.

* Change your thread. If your upper thread and bobbin threads are different types, try using the same thread for both.

Although you did this, it won't hurt to re-check. Make sure bobbin is threaded correctly.

Hope this helps.

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Suspect the needle and hook timing is off causing threads not to catch to make a stitch.

Try these troubleshooting tips:
With machine off, remove the bobbin and bobbin case. Push the needle bar to the left. Lower the needle to the bobbin case and notice when the needle starts traveling upward does the tip of the hook in the bobbin area align with the eye of the needle? If it does not align, the timing is off. If it does, move on to check upper tension:

Check that it is threaded correctly (both top and bottom) making sure that the upper thread is in the takeup lever. Watch the needle as you slowly turn the handwheel counter clockwise (toward you) and the needle point touches the fabric (make sure presser foot is down). Is the thread still relatively taunt? If it is loose, the upper thread tension unit does not have enough tension. Check the areas where the thread goes and make sure you remove any loose threads or fluff which could be inhibiting the tension discs from closing over the thread. If the tension unit still is not tightening enough, the tension unit may need to be replaced or the circuit board replaced. If everything is ok in the upper thread area, now look at the bobbin area. With no fabric, watch as the needle enters the bobbin area. Does it go down and the upper thread catch the bobbin thread and pulls it to the surface? Check for anything preventing the bobbin thread from being pulled up to the surface through the needle plate. If you have still not been able to resolve the problem suggest you take it to an authorized husqvarna viking dealer for service. You can locate a dealer near you by visiting the husqvarna viking website and clicking on the Dealer link on the left-hand side of the page - http://www.husqvarnaviking.com

Good luck.


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Dear VeeVeeV,
when I've had that problem it was due to incorrect threading of the top thread. Sometimes it "jumps" out of one of the thread guides, particularly the round one with the tension spring. The bottom thread looping & the machine not sewing is my first clue sometimes that it's done that. good luck, Georgia

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1 Answer

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hi there
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Looping on the top means there is no tension on bottom. The bobbin thread generally rotates counter clockwise. The thread must get under the tension spring. The spring must be adjusted equal to the top tension. This you will have to play with to tighten or loosen as needed. When you sew in a zigzag you might want to loosen the top tension slightly. On a regular basis remove the bobbin case and clean with a qtip. On the race put one drop of sewing machine oil. Clean the bobbin case and replace.

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