Video recommendation - bearing preload explained

[Bob Engelhardt]

"Hints on Spindle Bearing Adjustment":
https://www.youtube.com/watch?v=QAjpLmeBMWc

Creator is Alex Fillafer - accomplished machinist and engineering PhD. Check out his other videos and the car he and his father built at https://www.gtp13.com/

[J Tiers]

That one is quite good.

[dian]

iv seen that video and i put in a mental drawer: preload = 1/2 of maximum load. but looking at it again i dont really get what hes doing with the springs. he preloads the spring to half of travel. of course then the above holds. but lets say you preload to 10% of travel. well, then maximum load (being the load when back spring unloads, right?) is a multiple of preload. he then validates the rule by a calculation, but i still dont get it.

a dum bearing can be loaded more than a dul, before anything moves, that makes sence to me, so you wouldnt want to exeed preload at all.

[J Tiers]

The bearings and structure act like springs as well (remember, "everything is made of rubber"), so the real springs are just a visible example.

[pinstripe]

The video was interesting, but:

1. Doesn't the bearing manufacturer specify a recommended preload?
2. Wouldn't you aim for something close to the recommended preload, or is there some advantage to going well below the recommended?

The same guy has a video on how he made a scraped straight edge from a steel fabrication
https://www.youtube.com/watch?v=YanlyahWDOw