There is a few things that could be going on here.
Short answer is, something has slipped, take it to a pro and get them to sort it.
If you are hell bent on fixing it yourself then the best case problem is if the needle plate has just moved back slightly.
open the bobbin case door and on the left you will see there there is a locating pin holding the needle plate in the correct spot. It from memory takes a 1.5m or 1/16th hex screw driver to loosen, move and retightly. DO NOT STRIP THE SCREW!!!!!!!!
An 80 size unaversal needle (do not use ANY other type, not ball point, not stretch, just no)
should sit about a third of the way off the back of the hole in the needle plate
But before you go about shifting the needle plate position, take it off.
take your bobbin out, top thread out, put in a fresh needle, have the machine set to straight stitch in the centre and turn the machine over by hand (torch or lamp may be requiered to see)
as the hook passes behind the needle look at the clearence should be about 0.1mm. You will have to check this by eye.
If this looks fine, you can move the needle plate. if the gap is greater, or the needle touches the hook take it to a proper repair person. Unless you are one, I do not recomend trying to retime a machine like this yourself. You will only do more damage and cost you more to fix the original problem and what you caused.
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I have a Bernina 930 Record that will take twin (even triple) needles, so I don't know why your 1080 wouldn't. Just be sure your machine does not have the straight stitch plate on it, that your presser foot can accommodate zig-zag stitch, and that you carefully adjust any zig-zag stitch width so the needles do not hit the presser foot or stitch plate. I'd suggest installing the double needle and then carefully hand rotate the handwheel to see if the needles will hit anything. If you can make a full rotation of the handwheel without anything hitting, then slowly try it with the motor engaged.
Upper thread breaks
needle may be in backwards
Raise the needle bar to the highest point then loosen the clamp screw to remove the old needle, place the new needle in the clamp with the flat side to the back of the machine
Push the needle all the way up to the stop or as far as it will go, then tighten the needle clamp screw
upper tension may be to tight
the needle may be bent or damaged
thread may be hanging up in bobbin case--check area for loose threads or lint
also clean under the needle plate for lint and in the bobbin area for lint or threads
Most sergers on the market have needles that decend on an angle. Only a few are not made that way. Don't try to straighten it, the rest of the machine is designed with that "slant" in mind. Breaking thread in a serger can be many different things. Here are a few simple checks:
1. Change the needles
2. Make sure the thread is pulled deep into each tension unit, sometimes the thread will "ride" on the outside of the discs instead of being deep between the discs.
3. Check the needle plate and the loopers for rough areas. Sometimes the needles strike these parts and cause "burrs" which can grab the thread and not let go of it properly and it breaks or shreds the thread.
4. Some needle plates have pin like guides pressed into them. The sewing needles decend between these plate guides, however sometimes when a serger jams they can be broken. Verify that they are still there. They are very important for proper stitch formation, If they're gone, a new needle plate is needed.
There is special thread for denim/jeans. It usually comes in shades of brown. It's a little heavier and might help with the breakage. You might also want to try a little less tension. I assume you already have a Schmetz denim needle?
that is your problem, your needle bar is centered too far to the back. There are 2 little bolts (Below the presser foot lift on the back of the machine) that must be loosened while the needle bar is repositioned aligning the needle bar assembly.
I have found with any serger I have used that you have to cut the looper (bottom) threads before re threading the needle threads. You then rethread the loopers. If you don't do this, the needle threads keep breaking. Hope this helps.