Question about Sailrite Ultrafeed LS-1 Mechanical Sewing Machine

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How do I adjust the bottom thread tension?

The top stitches look fine, but the bottom stitches are loose and wobbly?

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You need more upper tension. Turn the knob clockwise.

Posted on Jan 01, 2009

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Some machines have a nob on the front loose is low numbers like 0 1 -2 most machines work well on number 3. If the nob is not on the front check and see if it is on the side.

Posted on Feb 12, 2008

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1 Answer

Top stitch is fine bottom is loose. Have tried adjusting tension but not working. If I get tension too tight breaks thread so I gradually change tension to no avail. Please help


Check your stitch sample. The loose stitches under the fabric--are they actually top thread???? Usually,stitch problems under the fabric is a result of a top thread problem. In this case, it could be bird nesting.

Remove the top thread from the machine.
Install a brand new needle.
ALWAYS RAISE the presser foot.
Rethread from the beginning.

Sewing Machine Thread Bunching Up Here Why

Birds nest under the fabric big loops of thread top side looks good...

Dec 21, 2017 | Sewing Machines

1 Answer

Bottom thread is still loose even if i try to balance the tension, how do i balance the thread tension?


You bobbin tension CAN be adjusted. First, thread your machine with different colors in the top and bobbin, set your top tension at its default, and run a line of straight, and then a line of zigzag stitches, and compare the results at the top and bottom. You will be adjusting your bobbin to your top tension. If the top tension looks like a straight line instead of stitching and the zigzag looks like "chicken tracks" instead of a zigzag, but the bottom looks like a zigzag, your bobbin tension is too loose.

Remove the bobbin case, and locate the straight-slot screw. There are generally two; one is a Phillips and one is straight--you want the straight one. Leave the other alone.

The rule is "lefty-loosy, righty-tighty." If your stitching displays the above symptoms, it needs to be tightened, so turn 1/4 turn to the right--no more--then test again. You will need patience, but don't turn more than that. It is easy to do, but if you don't do it systematically, you can make things worse, and very slight adjustments can alter the stitching significantly.

Apr 15, 2015 | Singer Sewing Machines

1 Answer

Upper thread has a loose stitch once in a while


check that bottom and top threads are the same quality and as well I would change the needle as a first port of call ...good luck

Sep 09, 2014 | Janome Magnolia 7330 Sewing Machine

1 Answer

How hat do to adjust the tension on my Singer 3201 - the under thread is real loose


If the bottom stitches are messy it usually means the top thread isn't threaded correctly.

May 10, 2014 | Singer Sewing Machines

1 Answer

Loose bottom stitches on Singer 1507


top tension must be adjusted to fix loose stitches of bottom stitches
adust the top tension one letter or number higher and sew on a scrap
piece of fabric till stitches look correct,, here is a free manual
http://www.singerco.com/uploads/download/36952a1312a6d8436174ef874f3662471a946b64.pdf

Jan 06, 2013 | Singer 1507

2 Answers

My thread on the top of the material is stitched fine.. the bottom stitch ballons


try changing the needle
rethread the machine use every thread guide
check to see if the thread has come off the thread take up lever
clean under the needle plate & in the bobbin area for lint
if none of these suggestions work, then the machine needs to be
checked to see if there is a problem with the timing

Sep 23, 2012 | Juki Sewing Machines

1 Answer

Singer 8770 beeps twice then stops stitching


do you have a manual?
try a new needle
adjust the top tension
try rethreading the machine top & bobbin

May 16, 2012 | Singer Curvy 8770 Electronic Sewing...

1 Answer

The bottom stitch is very loose. I've tried tightening and loosening the screw and the problem remains...HELP!


The bottom stitch is affected by the TOP thread tension :) First go back and make sure your bobbin tension is correct since you adjusted it. It should drop slightly when held suspended by danging it by the thread. If it reels out to the floor it is too loose. If it doesn't drop at all it is too tight.

Now that you have that adjusted look at your top tension. If it is loopy on the bottom side of the stitch the TOP tension is too loose. Increase the top tension.

Now take some scrap material and set machine to a wide zig zag, medium length stitch and sew a bit. Compare the top and the bottom sides of the stitch. They should look identical. Remember the TOP side effects the bottom and the BOTTOM tension effects the top side. Adjust accordingly until they look identical with no loose threads or loops and no puckering (puckering means it's too tight).

May 03, 2011 | Brother LX3125 Sewing Machine

1 Answer

Top stitche is to tight and bottom stitche is to loose


Meaning you have adjusted the tension for the top thread as well as the bobbin?

Use two distinct colors of thread - one for the top and one for the bottom.

Thread the machine with the presser foot up.

The two threads should meet in the middle of the stitch with neither obvious on the opposite side of the seam.

Set the top thread tension to 4 and adjust the bobbin as needed.

May 01, 2010 | Brother CS6000i Computerized Sewing...

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