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My bernette 334d overlocker keeps missing picking up the thread of the lh needle. Is this an adjustment? The other stitches are OK brian

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  • Sewing Machines Master
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Be sure to replace that needle with a brand new needle. A bent/damaged needle frequently will skip stitches.

Posted on May 16, 2017

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  • Sewing Machines Master
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If it has independent thread tensions for each thread , increase the tension for the problem needle thread

Posted on May 15, 2017

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1 Answer

How do I change the needle on my Bernette 303 overlocker


To be sure you don't drop the needle down inside the machine, place a piece of paper or fabric across the needle plate. There are 2 tiny screws above the needles. One does the right needle, the other does the left needle. Loosen the screw (do not loosen the screw so much that it will fall out--they are Hard to find!). Pull out the old needle. Push the new needle up into the hole (the flat side should face the back of the machine). Hold the needle in place while you tighten the screw.

Bernina Bernette 303 334D 335 Serger

Aug 14, 2017 | Sewing Machines

1 Answer

The overlocker does not pick up the second needle when overlocking


Be sure to use brand new needles.

Check that the needle tension is not too tight.

If it continues, it may have a timing issue where the needle is arriving at the wrong time to pick up the looper threads.

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Aug 21, 2016 | Sewing Machines

1 Answer

How do I set my Bernette 334D to overlock thin T-shirt material?


Thin, light-weight fabrics present some issues with sergers, ie the fabric tunnels with the stitching. Usually, it is better to use a narrow seam. Also, a stabilizer (wash-away) or even adding a strip of thin paper (toilet tissue, adding machine tape, etc) to the seam will help the fabric hold its shape when stitching. I have also sprayed & ironed heavy starch on thin fabrics to help stabilize.

sewing patternreview com

Serging Chiffon and Other Slippery Fabrics

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30 Best Tips for Sewing Knits with Serger Sewing Machine Serger Pepper


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Jul 02, 2016 | Sewing Machines

1 Answer

Need spares cutting blades for bernette 234 overlocker


Bernina Bernette 334D Overlocker - recent service identified the nylon gear cog inside overlocker is broken, Do you know where I can buy a replacement.??

Jan 06, 2013 | Sewing Machines

1 Answer

Bernette 334D overlocker - the edge of the fabric rolls under - can someone please tell me which thread needs adjusting? I only seem to make it worse...I don't think I have ever been able to get this...


I can help you with your 334D as I have the same machine; there is several ways to adjust the stitching width but firstly check the stitching finger position is forward not back for rolled hemming. There is a little lever that is on the side of the cutting plate just in front of the foot and feed dogs, you need to push this forward; this inserts a stitching finger into the needle plate and the overlock seam forms around it. When you pull it back the finger retracts to form rolled hemming where you want the fabric to roll under. So hopefully this is all that is happening now with yours but I'll go through the whole process for clarity and others.

This is how I set up for a new fabric project. Turn the tension dials for all four threads to 5. Your needle tensions should not need to be changed often; perhaps just if from the right side of a seam you can see the needle stitch, you may tighten it fractionally. Stitch length knob on the side by the flywheel should be on about 2 and a half and the differential knob on zero also.

Now you want to adjust the cutting blade position firstly to get the width of seam best suited to the weight and type of fabric you are going to seam. If you are going to use the overlocker to join two pieces of fabric in a 4 thread seam to assemble a garment, then always test with two layers too. And if you are going to just neaten a single layer seam allowance, then test on just a single layer and set up for that.

I'm assuming you are seaming 4 thread but the comments are the same for the 3 thread, you just take out the left or right hand needle first or just cut the thread to that needle and leave it in place to get the 3 thread stitch. (Obviously if you are seaming something delicate like silk, take the unused needle out as it will leave holes in your fabric. Be careful when changing needles, use tweezers to hold the needle right up into the housing and never unscrew the screw too far, just enough to get the needles in and out. And always manually turn the flywheel towards you through a stitch sequence afterwards to make sure you've got the needles clearing the loopers, if you hear them touching, recheck needles are fully into housing.)

If you are seaming something light then you'll want a narrower seam. Have you moved your blade before? If not, you need to turn the needle to the highest point, open the front cover and raise the pressure foot and swing it to the side so you can see better. Now put pressure on the upper cutting blade towards the right to release the spring on it, then swing it upwards out of the cutting position. Adjust the position of the lower fixed blade by turning the knob that is nearby to it. You'll see the blade moving over. Once you get used to making this change, you can just put pressure onto the upper blade to release it with one hand, and turn the knob to move the bottom blade with the other.

If you move it towards the right it will trim further away from your needles giving you a wider seam and if you move towards the left you'll get a narrower seam, ie it cuts closer to the needles. So set it to the position you want depending on what you are seaming. Now relower the upper blade into position, swing pressure foot back into place and test stitch again on fabric offcuts. Take a look at the seam. Is the fabric "tunnelling" inside the seam? if so, release the tensions on the upper and lower loopers by a half increment only. Test again. Repeat process until tunnelling is gone and fabric is sitting flat inside the threads.

If the threads are looping off the edge of the fabric, then increase the tensions on the upper and lower loopers by a half increment only. Test again. Repeat process until the threads are sitting right up against the cut edge, and meeting right on the edge.

That is basically it - please feel free to ask me again for more help is this hasn't been clear or you still struggle with this machine. I presume that you don't have the instruction manual for it so I could scan a page or two if this will help.

This is a really good quality overlocker so don't give up on it; it sounds like you have just never been shown how to use it fully or never had the manual; consider purchasing one from Bernina or online as it is very instructive. If you find that you still struggle with getting the stitch tensions right, its a good idea to spend an hour or two with some calico and thread it up with four different coloured threads like the diagram inside the looper cover, then make stitching samples and adjust until its right. You can make a four thread, three thread wide with left needle, three thread narrow with right needle, 3 thread rolled hem and flat lock. Write down the tension numbers, stitch length and blade position onto the fabric sample and keep these in a note book for future reference. This will help you to remember what you need to change when you want to use that stitch type again.

And my last suggestion, if you can find a good sewing machine dealership or fabric store that runs classes, see if they run one for "introduction to overlockers" - I took a class from the Bernina dealer I bought my machine from back in 1992 and it was fantastic. I've used mine for bridal veils with fishing line, made table cloths, curtains, cushions, sewed dozens of knit garments for the kids and made most of my own clothes with my trusty Elna and this overlocker; its a very strong machine and better quality than many others on the market.

Oct 08, 2011 | Bernina Bernette 75

1 Answer

I need to switch to rolled hemming and can't find my manual


Is this on a serger?

Rolled hemming on a serger is usually achieved by doing the following: thread up for three thread overlock using right hand needle. Move blade to the right to trim fabric wider (so it rolls inside the seam). Put woolly overlock thread through top looper (this gives a smooth finish to the rolled hem). Loosen off top looper and tighten up bottom looper so the bottom looper is up tight against the needle thread on the underside. Test serge to get the stitch right, then turn the stitch length down to 0.5 to close it up tight (this uses loads of thread so I usually get everything else right first, then make this final adjustment). On my Bernette 334D tensions are R-Needle - 5, Top looper 7-8 and bottom looper is 3-4. Stitch length 0.5, differential zero.

And usually you flick a small lever or change a little finger on the foot or plate where the stitch forms, there is some variation here between models. Early Elna L4 and L5 locks you had a little finger you changed with a screwdriver on the pressure foot. Bernette has a little slide mechanicism near the blade that you flick forward to engage.

Hope this is of assistance to you - I went for a 2 hour lesson on my serger when I bought it and then came home and repeated all the techniques shown and then made notes and stapled all the stitch samples into a notebook so I could remember how I did it.

Also there are some great books on Serging, Nancy Zieman is one name that springs to mind. Or try You-Tube, she has some videos up there too showing different techniques.


Apr 27, 2011 | Janome Sewing Machines

1 Answer

What is the settings for rolled hem using your overlocker


You haven't specified your overlocker make and model but some parts of the set up will be the same; you still need to consult your machine manual to find out the changes needed to the foot. Bernettes have a little switch near the blade that you flick to change how the stitch forms so it rolls.

You need a 3 thread overlock with the right hand needle (I'm assuming you have a 4 thread lock) turn the stitch length down to 0.5 so it is very closed up. And there is usually a little thread finger on the foot that needs to be changed or a switch you flick to move it back.

Then lower the tension down on the upper looper so this thread goes over the edge to the underside and tighten up the lower looper dial so this thread lies against the needle stitch.

Move the blade to the right so the fabric is cut wider than the seam that the threads are forming so the cut edge rolls underneath and is encased in the threads.

It is best to use wooly overlock thread on at least the top looper so this "fills" in the rolled edge.

If you visit you-tube and search using "Rolled Hem" or Nancy Zieman you should find some helpful videos too.

Apr 25, 2011 | Sewing Machines

1 Answer

How to thread up and the correct tension for chain does the lower looper thread go over or under the upper looper thread


What make and model overlocker?

Best bet is get hold of a manual for it; try the manufacturer's website, www.sewusa.com , www.sewingpartsonline.com or www.diplofix.com to obtain one.

You may also find some general information on www.sewing.about.com.

My Bernina 334D, sequence from L-R, is thread 3, thread 4, then needles, so top looper, bottom looper then needles. But if yours has a chain stitch it would probably be a little different.

Mar 03, 2011 | Sewing Machines

1 Answer

334d Bernette Overlocker


went to local berinina shop and purchased booklet for 10.95 aus dollars
thankyou feona

Jun 14, 2009 | Bernina Sewing Machines

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