The feed dogs in all Classic Bernina machines from the 130-180\'s will eventually come out of adjustment. This is due to the so-called cost savings modern manufacturing method of drilling holes in the machine frame parts and using thread forming screws instead of tapping or cutting cylindrical threads and the use of standard fasteners.
Regarding the screw fastener itself having a cylindrical screw form, the Bernina Classic machines used thread forming screws. Not necessarily a bad thing but in this case a dumb idea. Because these screws are not exactly cylindrical, they will not hold tight over time, hence loosening of the feed dog\'s height adjustment. You will need a T-10 Torx screw driver to make the adjustment.
Proceed by opening the bobbin cover door. You will find a rectangular opening to your upper right and will be able to see the screw head of the feed dog adjustment. With the feed dog in the upper most raised position, loosen the screw and lift the feed dog. Tighten the screw.
Check the height of the feed dog by rotating the hand-wheel in the direction of motion until the needle eye is flush with the needle plate. The feed dog teeth will also be flush in the normal position. If too high or too low, readjust to this height and, voila\'..... SewTechnical Home
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