It's possible that the cam or gear that does the buttonhole may be worn and needs to be checked to see if part needs replacing..
SOURCE: singer sewing machine will not zig zag
Over time, and especially when not used, there is a likelihood of dust and old oil forming a sort of glue, or clag....
Remove the needle for safety, then, when you have the setting on Zig zag, gently push the needle arm to the opposite side of the zig stitch.......release the needle arm, and if it springs back quickly, it is fine, if it moves slowly, or almost not at all, then the clag needs removing with application of few drops of methylated spirit to start, at the sort of piston affair that shifts needle arm L & R .....move the needle arm back & forth until it frees up, a drop of oil to finish.........if almost seized, may require leaving overnight after using a penetrating lubricant if it is really resistant....I have had them on the bench for 3 days with manual manipulation a few times each day before they finally come good.
Denatured alcohol is fine, surgical spirit too, different countries have different names or products, essentially alcohol with few impurities that will evaporate quickly with little residue.
Hope this does work for you, tho' as I said, it may take a little time to penetrate depending on severity........the same applies to the reverse mechanism of many machines when they seize.
If you want any more help with this, just post back here, or, drop a line through the "Contact Us" page at www.bargainbox.com.au
SOURCE: Zig Zag Not working on my Bernina 830.
Basically it is a matter of a stuck part. Flip open the top by prying up on the front or ends of the lid. You already noticed the hinges on the back. When you get it open, exercise the right hand lever on top (marked ZZ at bottom and 1-20 at top. If you look just to the right of this lever against the back wall you will see that it moves a little part back and forth into triangle shaped grooves. The part is not going completely into the grooves so drop some oil in there and exercise it a few more times, using your fingers if necessary to make the part move into the triangle grooves at the front and back. After a while it will loosen up where it should operate by itself smoothly . Hope this helps.
SOURCE: Bernina 830 won't zig zag, won't buttonhole, no decorative stitch
Basically it is a matter of a stuck part. Flip open the top by prying up on the front or ends of the lid. You already noticed the hinges on the back. When you get it open, exercise the right hand lever on top (marked ZZ at bottom and 1-20 at top. If you look just to the right of this lever against the back wall you will see that it moves a little part back and forth into triangle shaped grooves. The part is not going completely into the grooves so drop some oil in there and exercise it a few more times, using your fingers if necessary to make the part move into the triangle grooves at the front and back. After a while it will loosen up where it should operate by itself smoothly . Hope this helps, I know it will.
SOURCE: Bernina 1080 while sewing normal stitch, stitch
What stitch to you have selected for it to do? Please check to see if it is set for straight stitch only.
Linda at Relics
www.sewing-machine-manuals.com
SOURCE: Bernina activa 210 won't zigzag and has bobbin issues on straight stitch
it's very possible that the machine is slightly out of time & needs to be service at a sewing machine shop
is the fabric & thread & needle compatable with each other?
did you use every thread guide when threading the machine?
is the bobbin in correctly?
is the bobbin warped?
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