I am a recent graduate of mech eng. (2 and a bit years) and an very experienced inline-skater. Occassionally these two worlds colide (engineering and skating) and people look to me for engineering/science answers to their inline-skating problems.
Anyway, I came across something that I had to question myself, using Titanium in (minature?) ball bearings. It seems that some companies are trying to sell 608 designation ball bearing (8mm ID, 22mm OD, 7mm breadth) with balls that are either made of titanium or titanium coated.
Does anyone know of any reason you would use titanium as a ball material for a bearing application such as an inline skate/roller skate or skateboard wheel? Is this just a shifty marketing ploy because these days everyone knows that the strength to weight of Ti is superior to chrome/stainless steel? The justifications I have come accross are the strength to weight and lower thermal expansion, but is this really that advantages where the many of the apparently good bearings for skating have plenty of clearance from ball to races for expansion?
Are there other applications where a ball bearing with Ti/Ti coated balls would be used? What are the pro's and con's of titanium balls for ball bearings?
Thanks in anticipation,