|Kurt E. cleans and conditions my Bernina|
Last year, I had my oldest machine (purchased in 2004) "cleaned" at a dealer in Casper, WY. At Marilyn's kitchen table, Kurt, a certified Bernina technician, discovered they hadn't done a very good job: the gear controlling the bobbin was clogged with gunk. He surmised the "cleaning" was only cosmetic and that they hadn't taken the cover off of the machine.
My newer machine was purchased in September 2015 and just needed a bit of a tune-up and oiling.
I sat and watched Kurt take the machines down their chassis, which was interesting in itself, but he also explained a lot about the workings and how to properly oil the bobbin area. I asked to take some photos so I wouldn't forget the areas that I need to oil in the future.
While the photos are specific to Bernina machines, it applies to nearly all sewing machines.
First, remove the bobbin and expose the bobbin shuttle.
Oil the groove around the area that holds the bobbin shuttle with a small line of oil.
Make sure to oil both sides.
Then, clean the bobbin shuttle with a soft cloth and place a small line of oil along the grove on the top side.
Turn the bobbin shuttle over and oil the ledge there, too.
The Bernina has a plastic part that holds the bobbin shuttle into place. That also needs to be oiled where it touches the metal of the shuttle.
Make sure the bobbin shuttle is back into position and that the plastic ring is also snapped into place. Insert a bobbin and sew on a piece of scrap cloth until the oil is no longer visible in the stitching.
I was very pleased with the cleaning and conditioning that Kurt did on my machine. If you are in the Denver area, I highly recommend his work.
(photos and contact information shared with Kurt's permission.