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Thread shearing
I thought I was over this!
aquamarineerica

aquamarineerica
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Oregon USA
Member since 10/23/08
Posts: 319
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Date: 1/6/14 2:41 PM

I posted back in August 2013 about a thread shred problem. I honestly thought at the time it was problematic thread. I have searched the boards and am coming up with the conclusion that quite possibly it's not even the thread's fault.

At first I thought it was tension, but my straight stitches look very good. The thread shears whenever it decides to, but never with a straight stitch, and ALWAYS with a 3-step zigzag. Now, I do like to sew pretty fast, so I am wondering if that's part of the problem. I am piecing quilt blocks right now, and I like the edges finished so there is no chance of unraveling.

I will say that my bobbin winding was kinda crappy. Not so much when it was more full, but in the middle of it it looked kinda loopy. It (the bobbin itself) also likes to "shake" a little, like it has just a little too much room to move. But it didn't "shake" all the time, just off and on. I expect that when the bobbin thread is low, but it wasn't.

This is what I am using:

Schmetz Universal needle size 12
C&C Dual Duty Plus All-Purpose Polyester thread (both spool and bobbin)
regular medium-weight 100% cotton for quilting

I have done the following:

Threaded and re-threaded!
Cleaned the machine, especially where the bobbin drops in
Made sure the spool's notch was on the right side so the thread wouldn't catch and,
SLOWED DOWN a little...but it still does happen

Everything else I am happy with! I love this machine. It's never made an automatic buttonhole (can't get it to work) but I manage without it and don't think it has anything to do with this situation. If anyone can give me other ideas, it would be greatly appreciated and my Valentine quilt will thank you too!


Erica

------
Every day is a clean slate.
"Decisions are made by those who show up"...Allison Janney, The West Wing

dmh1
dmh1
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North Carolina USA
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Date: 1/6/14 5:18 PM

I'm wondering if you might have a bad needle or batch of needles? They can have imperfections on them that might cause thread breakage.

------
Michelle

SM: Janome DC2013 & Singer Futura Quintet
Serger: Janome Magnolia 7034D
Coverstitch: Singer 14T968DC

aquamarineerica

aquamarineerica
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Oregon USA
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Date: 1/6/14 5:24 PM

Or maybe I should switch to microtex?

------
Every day is a clean slate.
"Decisions are made by those who show up"...Allison Janney, The West Wing

Soolip
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Soolip
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Date: 1/6/14 5:58 PM

You have a burr somewhere along the thread path. Because this always happens with the 3-step zig-zag, this tells me it is somewhere in the bobbin area. If you don't know how to locate and repair this, take the machine in to have it fixed.

MartiP
MartiP  Friend of PR
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Date: 1/6/14 6:29 PM

It could also be caused by a rough area on the throat plate near the thread hole.

------
MartiP

Ruckertt's Law; There is nothing so small that it can't be blown out of proportion.

Bernina 1230 Bernette 007D
Brother CS6000i Brother 2340 CV
New Home L372
Singer 221K (off white)
U.S Blindstitch, Model SL 718/2D
Simplicity SE2
Brother 700II

Mary Hayes
Mary Hayes
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In reply to aquamarineerica <<
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Date: 1/7/14 0:39 AM

try a microtex(sharp)needles Or top stitch needles.

------
Normal is nothing more than a cycle on a washing machine. -whoopi goldberg

bestgrammy
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bestgrammy
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In reply to aquamarineerica <<
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Date: 1/7/14 1:21 AM

What kind of bobbin is being used?

Edited to add: The sm's bobbins should fit precisely...not jumping or rattling. Does it have a Janome J class 15 plastic bobbin in it?

Check the sm's threading path for bobbin winding...thread should be smooth and even all the way through the entire bobbin.

To clarify: In addition to cleaning under the bobbin...has it been cleaned out under the bobbin holder? While the bobbin holder is out check it for any nicks etc...if you see something that can't be smoothed out gently with the fine side of an emery board then a new bobbin holder is needed.
-- Edited on 1/7/14 11:46 AM --

tourist
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Date: 1/7/14 10:13 AM

Soolip - yes! I had a small burr on the bobbin hook on a machine some time ago. I used a very fine stone (which I think is actually a fish hook sharpener) to smooth it off and haven't had any issues since. Had forgotten about that.

------
http://bgballroom.wordpress.com to follow the progress on my next ballgown.

Pamela R
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Date: 1/7/14 10:56 AM

I had so much trouble with that some years ago and replaced 4 stitch plats after doing all the steps that you have suggested and finally a tec found that the needle assembly was not in straight. I have never had a problem since.

Learn To Sew
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Date: 1/7/14 11:24 AM

When you wind a bobbin, do you gently hold onto the thread to give it more tension as it winds? I have to do this with my Pfaff or what a mess a bobbin is. It practically makes knots in the thread as it winds. A gentle holding of the thread between thumb and forefinger, and I get perfect bobbins. I had the machine for 5 years before a Tech told me to do this.

------
Bernina 630, my much loved main machine
Bernina embroidery module
Pfaff 2036 my back up & travel machine
Babylock Molly, mechanical
Bernina 1200DA serger
Unique Sewing Cabinet 450L

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