I enjoy reading all the comments but apologize that
there are so many I can’t answer individually. I’m delighted that my
new videos have been so enthusiastically received, which is reflected in
the majority of the comments. The videos aren’t perfect though so below
each video I’ve compiled the comments about things I omitted or people
thought were misleading. A few comments added wonderful additional
information so I’ve included them as well.
Several people suggested additional topics. Ceramic
bearings don't suffer metal fatigue, don't mind high temperatures or lack of
lubrication - but are only used for specialist applications because they're
brittle.
A dry chemical called Tungsten Disulphide is very good at
reducing friction and I think added to some oils.
I probably should also have included thrust bearings.
These are like thick washers, with a radial ring of roller bearings. They
are useful for supporting heavy vertical shafts and with bevel gears, which
push out strongly when rotating.
