Question about Kenmore Drop-In Bobbin 505S-21BH Mechanical Sewing Machine

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Bobbin tension problem with kenmore model 385.16231300

My bobbin tension seems to be off--I keep getting a balled up mass of thread on the bottom of my fabric. I have gone through the manual and looked all over the machine and can't find anywhere to adjust bobbin tension. I am positive my machine id threaded properly--the take up lever in particular---HELP

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I discovered the same problem. What I figured out (after having the machine "repaired" several times) is that it seems as if the bobbin type may be the suspect. I started looking closely and it seems as if I have 2 different types of bobbins. So, I tried both types. Since I don't know the bobbin number(s), you will have to put up with my description .... the bobbin that is flat, top & bottom, seems to bunch up. The bobbin "bounces" when I sew. The bobbins that are rounded on the top and bottom don't seem to "bounce" and it doesn't bunch up the lower thread. Now, I have read my manual front to back and it does not say what bobbin type or number to use. So, if anyone knows, it would be a great help. I am assuming the correct bobbin is the "class 66" bobbin. Does anyone know for sure?

Posted on Apr 29, 2011

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If You have a drop in bobbin you will have to remove the hook and adjust the tension, however try adjusting the top tension before you remove the hook.

Posted on Aug 06, 2009

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Related Questions:

1 Answer

What is normal tension settings on a kenmore model 158.12112


The tension depends on what you are sewing but usually a 4 -5. Also make sure thread and needle are the correct size for the materials you are sewing. and make sure needle and bobbin are threaded correctly and that needle is not, blunt or bent. :)

Mar 21, 2017 | Kenmore Sewing Machines

1 Answer

Tighten the bottom stitch and keep it from balling up.


Do you have the bottom bobbin inserted correctly and fully seated?

Dec 17, 2014 | Sewing Machines

1 Answer

Kenmore bobbin issues


try these suggestions
Bobbin thread breaks
1. There is a right way & wrong way to insert the bobbin in the case --when you insert the bobbin in if it doesn't stitch correctly turn the bobbin over see if that helps or bobbin case is not inserted correctly
2. Lint has collected in the bobbin holder
3. The bobbin is damaged & doesn't turn smoothly
4. Lower thread tension is two tight

Oct 25, 2012 | Kenmore Sewing Machines

1 Answer

I have a Kenmore sewing machine - 12 stitch model which I bought in the 70's. I am having a tension problem and can't seem to fix it. What is the normal setting for the top, and bottom?


Hello

Load your Kenmore sewing machine with the right thread and bobbin thread for your project. If you use the wrong weight thread for your fabric or severely uneven weights of thread, this can cause the appearance of a tension problem when it is, in fact, a thread weight problem or a problem with your sewing speed. If you go too fast, you will break the thread. If you go too slow, you can cause loops. Uneven pressure can cause stitches to vary greatly.

Test your Kenmore sewing machine's tension by sewing on a piece of scrap fabric. If your tension is way off, then test on some basic cotton or a firm blend simply to get your tension right. Do not try to start adjusting your tension on silk or leather. Get a base adjustment on a more standard fabric first.

Look at the top threads and bottoms threads. If the tension is off on one side, it will usually affect the other side slightly. So select the side that looks more maladjusted to start adjusting the tension.

If the top thread is too loose or too tight, you will need to adjust the tension dial. This dial is usually located a few inches above the needle on the Kenmore machine body. Usually, your machine will have markings to indicate which direction tightens the tension. If these have worn off over the years, watch the dial as you turn it. If it appears to move toward the machine body, then it is tightening.

If the bottom thread is too loose or too tight, then you will need to open the door to the bobbin case. On some Kenmore models, there is a little screw near the bobbin case that can be adjusted slightly to adjust the tension. On other Kenmore models, there is a screw on the bobbin case itself--not on the bobbin, but on the bobbin's casing. This will also adjust the bottom thread tension. Adjust the bobbin thread tension to make slight changes.

If the thread is looping severely on one side, the thread weights might be off. For instance, look to see if you have a lightweight thread on the bobbin and a heavyweight one on the top. If the thread keeps breaking, the top tension or bottom tension could be too tight or the thread is too lightweight for the material you have selected. Check your combination of threads and material. Also make sure you are using the right weight needle and the right foot for the sewing step or project you are working on.

If your Kenmore sewing machine's tension is off severely or if you have not used your Kenmore in a long time, then you might need to take your machine in to be serviced. Sometimes, the inner parts need to be oiled or the entire machine might need to be cleaned and calibrated by a professional. If you sew a great deal or if your machine sits idle a lot, both situations will usually require some servicing to keep your Kenmore sewing machine and its tension in perfect working condition.

Jul 11, 2011 | Kenmore 15358

1 Answer

Uneven bottom stitches that ball up every 4th or 5th stitch


Have you threaded the bobbin correctly? If it is in the wrong way it will do that. Hope this helps.

Mar 08, 2010 | Sewing Machines

1 Answer

I have an older kenmore sewing machine. It's been


When I have run into similar problems with my older Singer, it's because there is a bit of thread caught somewhere in the bobbin mechanism that doesn't allow the shuttle to run freely. Take the bobbin assembly apart and use a bright light to see if you see any bits of thread in there.

Good luck and let me know if this works!

Jan 14, 2010 | Kenmore Sewing Machines

1 Answer

Kenmore Sewing Machine Drop-in Bobbin Tension Adjusting Problems


looped stitches are usually caused by improper tension. when the loop is on the upper side, it may be corrected by loosening the top tension or by tightening the lower tension (turn the tension screws on the bobbin a hair at a time)

since using the machine only a few times it is best to clean the machine from dust (can use a can of air) blow air into the bobbin area and between the tension disks and under the throat plate.

make sure the machine is threaded correctly and bobbin is evenly threaded

Aug 26, 2009 | Kenmore Sewing Machines

1 Answer

No bobbin tension


If the thread is loose on the bottom of the fabric, it's actually the top thread is too loose. Think of 2 little elves playing tug of war in your machine, one on toip and one underneath. If you have loops on bottom, the top needs to pull harder (tighten top tension)

Mar 18, 2009 | Kenmore 15516 Mechanical Sewing Machine

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