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Forum > Sergers, Coverstitch and Blindhemmers > Coverstitch Problem ( Moderated by CarolynGM, Deepika)

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Coverstitch Problem
I've got a Bernette FunLock 009DCC
BeckyC
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BeckyC  Friend of PR
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Date: 1/2/07 10:30 PM

Well, I've been putzing with my Bernina FunLock 009DCC coverlock machine all night and can't diagnose why it will sew a perfect stitch on muslin, but when I stitch on ponte knit or my windpro polarfleece the lower looper goes looopy.

Here is a picture of what it looks like -- it stitches fine on the muslin and sporadic on the knits. I wanted to hem my Windpro Polarfleece pants. This is what I've done to the machine so far tonight.

1. Completely Rethreaded in specific order
2. New size 80 Universal needles -- no difference
3. New size 90 Stretch needles -- helped a bit
4. Less pressure on pressure foot - helped a little bit
5. Rethreaded lower looper and needles again -- no difference
6. I made sure the thread holder was fully extended

It looks like the thread is breaking every once in a while on the bottom, but doesn't affect the top stitching.

I used the machine this weekend to hem a jacket with no problem at all. I've had the machine for 3-4 years and haven't had this much problem before. I thought I had it figured out and it went wacky again. Have anyone experienced this before? What suggestions do you have? Can anyone point me in the right direction on a website for help? I can always call my dealer tomorrow, but this is really bugging me tonight. If only Bernina had troubleshooting pictures in their manuals.



Edited to fix picture link - hopefully.
Having problems editing...
-- Edited on 1/2/07 10:34 PM --
-- Edited on 1/2/07 10:35 PM --
-- Edited on 1/2/07 10:37 PM --
-- Edited on 1/2/07 10:37 PM --
-- Edited on 1/2/07 10:39 PM --
Done editing
-- Edited on 1/2/07 10:41 PM --

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I feed my soul by the stitches I sew.



ccris
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In reply to BeckyC


Date: 1/2/07 10:58 PM

I don't have a coverstitch so I'm not going to be of much help. Hopefully Vonnevo or Debbie Cook will see your post. Maybe one of them will be able to offer some suggestions. Did Debbie ever have a tutorial on troubleshooting coverstitch problems? You might want to look at her site.

The only thing I can think of is to clean out lint that might have collected in some nooks and crannies. I've also read (don't know where) that a "sharp" needle (90-14) works on fleece. I wouldn't want to use a sharp on ponte though.

BeckyC
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In reply to ccris


Date: 1/2/07 11:10 PM

I'll have to check Debbie's website to see if she has any hints. I love her method of finishing off the stitches on coversitch machines. Yep, I was hoping someone like Debbie or other CS owners would help out. I just bet they're all in bed where I should be!

I hadn't thought of using a sharp on the fleece, I don't think I even own any. I'll have to go dig through all my needles to check it out. Maybe a Microtex needle might work too. Worth a try in the morning. I took a look to see how dusty and linty it was, it wasn't very much at all. But tomorrow I'll probably take it all apart and give it a good cleaning and oiling. But first I'll try some different needles, because it definitely is the fabric that is making it wacky.

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I feed my soul by the stitches I sew.



Betakin
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In reply to BeckyC


Date: 1/2/07 11:11 PM

I usally suggest the Schmetz ELx705 needles especially recommended for coverhem stitches if your machine can take that type but after seeing the pictures of your threads it seems more is going on. Looks like pressure and tensions are both off. I know on some coverlock machines the handwheel is turned back to release threads but in rotating the handwheel in the wrong direction for prolonged periods it can cause internal damage that causes thread breakage. It might just be something minor that is overlooked but since you have had the machine for sometime it just might need a bit of service. I hope you can fix the problem or maybe your dealer can. Good luck to you.
Sheesh I had to edit for more spelling errors. but I see good advice is given since this post that might help you more with tensions. My coverhem has auto tensions and I really haven't experience any problems as such to help advise.
-- Edited on 1/2/07 11:20 PM --
-- Edited on 1/3/07 0:48 AM --

Leslie in Austin
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Date: 1/2/07 11:15 PM

I've had this same incomplete stitch problem on the same machine, Becky, but it happened for me when trying to encase elastic in nylon/lycra to make athletic wear straps. My Bernina dealership suggested trying size 11/75 titanium needles. I had a bout of sewing attention deficit disorder, so I never did test to see if that worked....


-- Edited on 1/2/07 11:16 PM --

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Leslie

Sew4Fun
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In reply to BeckyC


Date: 1/3/07 0:00 AM

Hi Becky,
I've got the Brother CS machine (had it for 3.5yrs) and also a Huskylock with CS (had it for 7yrs).

My thoughts is it is probably the needle. Polarfleece needs a Universal needle. Size 80 isn't big enough IMHO, you need at least a #90. So that's my first suggestion. Switch to a #90 Universal needle.

My next suggestion is to reduce the needle tensions. In particular the one which is skipping (left one in the photo). From what I can tell the looper isn't catching one of the needle threads. This can be a needle issue (needle isn't large enough or not the right type for the fabric) or it can be a tension problem or both. If the needle threads are too tight the looper can't 'catch' the needle threads as you sew. So try reducing the needle tensions.

HTH and good luck,

-- Edited on 1/3/07 0:03 AM --

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Belinda. Melbourne, Australia
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Debbie Cook
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Date: 1/3/07 0:01 AM

It looks like skipped stitches to me, not thread breakage. Test it, by pulling the threads out. Is the looper thread unravelling as one long thread?

I'm with Kylynne ... ELx705 needles, size 90 needles, but definitely use the 90 stretch that you already have.

Another suggestion ... increase the stitch length. The stitches look a bit too close together for a thick fabric.

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"I base my fashion sense on what doesn't itch." Gilda Radner
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Vonnevo
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In reply to Sew4Fun


Date: 1/3/07 0:46 AM

Quote:
From what I can tell the looper isn't catching one of the needle threads. This can be a needle issue (needle isn't large enough or not the right type for the fabric) or it can be a tension problem or both. If the needle threads are too tight the looper can't 'catch' the needle threads as you sew. So try reducing the needle tensions.

A good diagnosis Belinda. This is what I am thinking too.

I have never used any CS machine but my Janome CP, but the same problems can occur with that too.
It might need a thicker needle too, say the 14 (90?). A larger needle hole will put less resistance on the top threads, while they are trying the "catch" the looper thread. And less tension on the threads too.

Do let us know how you are doing and the fix that remedies this problem, it will be useful to other CS users too.

Good luck Vonne
-- Edited on 1/3/07 8:49 AM --

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Vonne O Brisbane Australia
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Sew4Fun
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In reply to BeckyC


Date: 1/3/07 1:20 AM

Just a word of caution. Check your machine's manual before using a ELx705 needle, to ensure they recommend this needle type. If your machine doesn't accept this type of needle it can have disasterous results.

The Babylock and Janome use the ELx705 needle type, Brother and Husqvarna use the standard needle type (130/705H) but I have no idea what the Bernina uses. Check your manual first!

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Belinda. Melbourne, Australia
http://sew-4-fun.blogspot.com/

Betakin
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In reply to Sew4Fun


Date: 1/3/07 1:42 AM

I totally agree with Sew4fun. Check your manual first before using EL needles. That's why when I suggest using them on Coverlocks I always post "if your machine can use them". I believe most Bernina's are made by Juki and probably the 009 is too. It seems these machines can take regular household needles so I don't know if Juki can use the EL but most Coverlocks can. My other brand serger that is a non coverhem also came with EL needles in the serger. I think we all know that needles vary in the scarf and length and noboby wants a broken looper.

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