Just a bit of a theoretical discussion here. Wondering where and why would you ever use a fastener without defining a preload? PTC has made this an "option" that you have to toggle on and off to be able to set a load, but I can't think of any case where I would be using a fastener and NOT want a clampling load. Following the old adage of never say never, there must be some instance where this would make sense. Still seems like if I don't care about a preload (re: clamping force) between two components why even run both? Why not just eliminate one and run the other by itself. Or let the parts default to "bond". Maybe putting in "fake" thin washer/spacers or raised areas to avoid bonding large contact surfaces. Hmmmm....
Cheers...
