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Slant-O-Matic 401. Bobbin tension to loose. Have tried turning screw, just won't fix this time.

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  • Sewing Machines Master
  • 12,731 Answers

It could be that the bobbin case is old and worn (normal with wear-n-tear). You should be able to find a replacement that will work. Check at the local sewing repair shop.

Posted on Sep 04, 2017

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE:

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Posted on Jan 02, 2017

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  • 84 Answers

SOURCE: Janome Memor Craft 10001 bobbin tension

Hi,

There is an adjustment on the side of the black bobbin case.

Remove the needle plate, to gain access to the case. Lift it out, noting how it is positioned! On the side of it , there are two screws, one is the adjustment screw - its the one that sits out more. To increase tension, turn it clockwise 1/8th of a turn, reassemble and test sew. (make sure the top thread tension is back to where it should be). Repeat if required. DO NOT adjust too much at a time!

Good luck

Posted on Oct 22, 2007

bargainbox
  • 1388 Answers

SOURCE: bobbin tension

This is an issue of your upper thread tension, so take a look at this generic tension solution

If you are in a pickle with your bobbin case, check top tension and bobbin case are free of lint, reset the top tension to 4, and adjust the bobbin tension to suit......some more detail on how to do that, is here

Bargain Box

Posted on Jan 30, 2008

  • 323 Answers

SOURCE: Tension

I'm assuming the thread is looping on the bottom. If this is not the case, ignore the rest of this.
Perform a tension test. Tension assembly test. To do this test. 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 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.
sewman7

Posted on Aug 02, 2008

  • 97 Answers

SOURCE: thread or bobbin tension

Thread tension. Beware of adjusting the bobbin screw. Pfaffs maintain their tensions just fine without adjusting the bobbin tension, unless you're using some crazy thick or fine thread. If you must change your bobbin tension, you would be well-advised to buy an extra bobbin case, because re-calibrating your tensions after changing them can be less than fun.

Increase your top tension, and your looping should cease. I normally keep my tension around 4.5. Also make sure you're using a good quality thread, and that there's nothing in the upper tension assemblies. Sometimes a tiny piece of debris can keep the top tension from applying enough tension, so turning the machine off and blowing some canned air in there can help as well.

Good luck,

-R

Posted on Mar 11, 2009

  • 371 Answers

SOURCE: The bobbin thread on my Viking Designer 1 is too tight

In most cases, this is caused by loose threads and fluff being in the upper tension unit rather than a problem with the bobbin. There is a screw on the bobbin case that losens and tightens the resistence. However, it can easily come out and then you have a mess.

Try this to check the bobbin thread tension -
Take the bobbin case holder out of the machine. Use a bobbin that is about half full and use standard 50 wt sewing thread.
Take your needle plate (the metal plate over the feed dogs that has markings showing stitch width under the presser foot).
Thread the bobbin thread in the bobbin case, holding the case so that the thread is through the tension spring as though it is in the machine, tied the end of the tread to the needle plate and have it hang below the the bobbin case.
If the needle plate immediately drops to the floor, unwinding the bobbin, the bobbin tension is too loose. If you jiggle the bobbin case slightly up and down and the needle plate moves slightly down, it is just right. If it does not move at all it is too tight. The resistence should be 14g which is the weight of the needle plate.

The upper tension unit, look straight down from the tension unit and you should see some metal disks which the upper thread rides through when threaded. Take your small cleaning brush and brush out any loose threads/fluff there. Look down the left side of the tension unit to make sure there is none hiding.

When you tighten the upper tension unit by pushing the tension buttons on the screen, do you hear the tension disks tightening? If not, it may be the pc board or the tension unit itself that will have to be replaced.

Otherwise, you might want to 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

Posted on Feb 13, 2010

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When i sew a test piece of fabric on my sewing machine to check the stitching, the top thread seems fine but the bottom thread is loose and adjusting the tension doesn't seem to help


there are two thread tensioners on a machine
the first one is on the front of the machine for the top thread
the second is the small screw that holds the small flat spring under which you pull the thread after you put the bobbin in the holder
as you put the bobbin in the holder you have to pull the thread around the side until it slips into a small slot then under a retainer spring
that spring is adjustable by that small screw
the amount of tension added or released by that screw is minute so as little as 1/8 turn has a big bearing on the amount of tension of the bobbin thread so turn it just a small bit at a time until the thread tension is correct

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Bobbin tension is one of the biggest problems most sewing machine operators have. Check information sent for assistance on this.
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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

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Hi Sara
If you don't have the manual for your Singer 401 you can find it online for FREE. Lots of people try to sell these but they are usually available somewhere online for no charge. Here is the link to the one I found:
http://www.ismacs.net/singer_sewing_machine_company/manuals/singer-401-slant-o-matic-sewing-machine.pdf
There is a section on adjusting tension for the needle by turning the tension knob. Sometimes you have to try a test run on a scrap of fabric. If it is too loose then turn the tension to a higher number, if too tight turn to a lower number. Probably start in the middle around 4 or 5 The bobbin tension is adjusted with a screw. Then manual has some illustrations. Hope this helps.
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it is called bird nesting and indicates that the needle thread is not tight enough

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Mark the **** (in the screw head) position on the bobbin case with tiny dab of nail polish so you will know where the original setting was.

Left/loose and right/tight.

If you are adjusting because the bottom stitching is loose/loopy, first try threading the machine with the presser foot up to see if this solves the problem.

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