Hand quilting thread should NOT be used in a machine...not because it "doesn't bend" but because it's waxed and can gum up the innards of the machine.........
I have Viking, BL, Brother, and Singers...new and FW...all will work with any thread I use with it.....there are adjustments on machines to be used to make a good stitch, and needle sizes to do the same thing depending on fabric used and threads used.....it is not rocket science, but some adjustments are necessary with some projects...and of course the dreaded four letter word......LINT.......just like dust bunnies under the bed!!!!!!!!