Sewing machine / BERNINA knowledge test

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1. Explain in detail how a stitch is formed. *

2. What is the loop lift?*

3. Bernina has 3 different hook systems: Tell me in short how each works and at least one advantage and disadvantage for each system. *

4. Take a look at the serial numbers below. In what year were those BERNINA machines built?

73249964 57/02*

34567823*

47921564*

63235894*

22335678*

5. What is the function of the take up lever?*

6. What is the function of the check spring?*

7. Which adjustment most likely can go off during shipping? *

8. With the timing being perfect, which adjustment could be off when skipping stitches in Zig-Zag stitch?*

9. You have and older BERNINA machine on your bench. The tension is good, the hook timing is good but the stitch is just not pulled tight like you would prefer. What adjustment will you check next to solve your problem? *

10. Needles: As you know there are tons of different needle systems out there. Bernina has one major needle system in just about all their machines. What is the needle system?*

11. Some older BERNINA's take the needle system 705B. What is the difference between that needle and the needle we are use today? *

12. Each needle system has different sizes of needles. The numbers are telling you how thick the needle is….correct? What do the numbers mean? 80/12 explain both numbers *

80 means? 12 means?

13. A customer is asking for your advice. “I got this beautiful piece of heavy leather someone gave me and I will make a Jacket out of it. I will insert cotton lining so it feels nice on my skin. What needle would you recommend using to sew this?”

14. There is a needle system out there called ELx705. Where would I possibly use this needle?*

15. What is the difference between an ELx705 and our standard needle system we use in our BERNINA’s? *

16. Many parts in a Bernina sewing machine (from the oldest to the newest) look like the picture below. As you turn the main shaft you see there are two screws that hold the part (collar) in place. To almost 99% of the time, one of those screws will be screwed down to a flat part on the shaft. Which screw is on the flat?

Which screw is on the flat part?