Question: is it safe to expect, that the weight of the part of a properly designed light alloy rim, which is located to the left in relation to the geometrical plane the hub contact surface is located in, equals the weight of the part of that same rim, which is located to the right in relation to that same plane?
If not, is there a trick how to practically locate the imaginary geomentrical plane (perpendicular to the central axis of the rim), which splits a light alloy rim rim into two parts of identical weight? Maybe some non-obvious rim manufacturer´s marks or similar?...
Background for asking: when you do a bubble balancing of your wheels, you can only do static balancing - with all the downsides of not being able to do dynamic balancing. However should you be able to find a way of placing your balancing weights in the abovementioned geometrical plane, your static balancing will not cause any problems with the dynamics of the rotating wheel and would be as good as dynamic balancing is...
Any ideas are welcome, except for sending me to a tire shop with a machine capable of dynamic balaicing 😉
Well we used to do bubble balancing all the time decades ago in the '60s and '70s and had no problems. If you knew how to operate the machine. You would use two weights on the outside and two weights on the inside. Problem is it takes an expert to do it correctly so they went to dynamic Force that machines that an idiot can operate. Problem with those machines are is they often get out of calibration. And I just don't theoretically comprehend how you can put one weight only on the outside and it balances it instead of having two weights on the outside and two weights on the inside. I suppose there's some physics involved in it but it's beyond me. I like the old bubble balance machines myself
@scottykilmer
What a bubbling balancing expert basically does is: he uses his experience in eyeballing to place his static balancing weight in the geometrical plane I did my best to describe in my initial post. In case of two weights placed one outside and one inside, in terms of dynamic (im)balance the delta counts. If the expert is lucky in precisely hitting this imaginary plane, his static balancing is as good as the dynamic one. Of cause with eyeballing you are never 100% on target, but in real life with experience you can be repeatedly reasonably close, and this is indeed safer than relying on a miscalibrated digital machine operated by some random loser on a minimal wage.
Since I am not a bubbling expert, I was looking for an alternative method to pinpoint this plane. But I guess such a method simply does not exist, so I guess I will just have to gather my own experience based on the best practicies described in the Internet.
In an ideal world (if all car designers were perfectionists) this plane would imo cut right through the middle of the wheel bearing, but I do suspect that in real life the geometry of the wheel-and-hub assemblies is much more dependent on the overall car layout considerations rather than on those of perfect wheel balance.
In any way I find it cute that you like those bubble balancing machines like I do. Thanks for replying, and Cheers!