He's added a fourth axis

[Tom]

Axial forces or Friction?

I fancy a "Friday night pub quiz"....

George, the question is in two parts:

1) What is the difference between these two identically sized bearings? The answer I'm looking for is not £12.03
http://simplybearings.co.uk/shop/p17...duct_info.html
http://simplybearings.co.uk/shop/p51...duct_info.html

2) Assuming it was suitable for the task, which one would you install into your (hypothetical):
a) Moon lander
b) Nuclear submarine
c) Power station
d) Gantry crane
e) Precision 4th axis
f) Miscellaneous 23.5hr/day, production critical machinery
g) Front car hub
h) Rear car hub
i) Shonky 4th axis built as a learning exercise

Winner gets a pint. *In true pub quiz style, I reserve the right to fall asleep before the end of the discussion and not notice it's all finished until I see that all but one table is looking depressed.

By the way, it's not a loaded question. I haven't built my first shonky 4th axis yet, but when I do, it WILL be shonky.