Will the magnetic strips interfere with our machines if you get it too close to the computer parts?
Yes. It seems like a good idea -- however, you should keep all magnets away from all computer components. Even magnets on the outside of a computer tower (desktop) can interfere with normal operations and data.
It is also possible that the bobbins will become magnetic themselves. Even in a old mechanical machine that could cause problems.
my metal bobbins are for regular phaff sewing machine. I have it on its sewing table.
Rescuer, that was my first thought, as I have had pins that were in one of those "catch" dishes become magnetized over time.
I have had my scissors that stay next to my machine become magnetized. Pins started sticking to them. Had to buy a de-magnetizer and run them over it from time to time.
If it is strong enough magnetic could also hold scissors.
Great idea if you have metal bobbins, I only have plastic.