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Serger not cutting right

My Bernette 334 DS is not cutting right. It seems to be eating the fabric, kind of chewing it up. I replaced the lower knife with what I thought was a new blade. I have adjusted the level. Still eats the fabric and does not look neat at all.
I thought that maybe this is a very simple problem to fix.
Please let me know what I am doing wrong!
Thanks so much,

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Posted on Jan 02, 2017

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SOURCE: mine is a simplicity 804 easy lock

Your knives may be blunt and need sharpening or replacement.

Check also if the knives are aligned properly. Remove the material and turn the handwheel slowly. The knives should pass each over like a pair of scissors and there should not be any cap between the blades.

If everything seems to be okay and it still does noet cut tne material, replacement is the only option.

Posted on Dec 08, 2007


SOURCE: cutting knife adjustment

I have found this mentions both threading and changing the knife width. I hope it is useful.

Posted on Jul 07, 2008

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Posted on Sep 11, 2009

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SOURCE: bernette for bernina funlock 004D/004 locked

you may have a build up of fuzz or lint try to clean and oil it

Posted on Dec 13, 2009

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SOURCE: how do you prevent pfaff sewing machines from

This happens with other brands as well.

Hold on to the threads behind the presser foot and hand walk the first two or three stitches.

Some like to use a leader/spider.

Fold a scrap and stitch to the edge and then **** with the fabric you want to sew.

Remove the leader and use over and over and soon the leader threads will resemble a "spider".

Posted on Mar 09, 2010

Testimonial: "thankyou so much for your help and quick response, much appreciated!!!"

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