FYI : The label on the can of Jet-Lube MP-50 I recently received says , " Service Rating : -300[SUP]o[/SUP] ( -185[SUP]o[/SUP] C ) to 750[SUP]o[/SUP] F ( 400[SUP]o[/SUP] C ) 300,000 psi Film Strength "
It would. However, since not all of the male splines are touching the walls of the female grooves at any given moment due to machining tolerances and the position of the swing arm, we would have to approximate or even assume the worst possible case - i.e. say only two splines were engaged at a time.
I believe what he is saying is that he's calling it.
If any of this was the case, Honda engineers are worthless. The position of the swing arm has no bearing on the spline contact patch. The rear hub is held in place by the spines and axle. The swing arm just allows for a smooth ride, think hard tail, not. Tolerances are to ensure assembly when one item is manufactured to the high side and the other to the low, Not to allow such a sloppy fit that only 2 splines are engaged. If that were the case that the fit was that sloppy, the final drives would be spitting teeth, left and right.
Assuming only two splines being engaged would be what the engineers call a " worst case" analysis, I believe.
not really
More than two abut fewer than 32 splines are actively engaged at any given time.
they are not, note in all the pictures that have been posted they are straight teeth. Also, they are not gears, as in meshing/unmeshing as they rotate, the male/female parts do not rotate relative to one another, they remain in one orientation constantly. As the female spline circle is rotated by the driveshaft the wheel matches that rotation through the spline connections.
That would be perfection. In reality, more than two splines would take the load, but not equally. But to do a "worst case" analysis when calculating the maximum pressure that the moly has to withstand, only two splines engaged should be assumed - 180 degrees apart. And , in reality the only way all splines would be equally engaged is if the machining was perfect and matched between the inner & outer splines - an impossibility in reality.
Three questions: 1.) How close to the ocean do you live ? 2.) Do you believe the mechanic ? Did he bother to grease the splines ? ( They look awful dry. ) 3.) Does the mechanic smoke those funny little cigarettes while he works ?For people who think it doesn't matter what you use in the splines, here goes 2 pictures of my Valkyrie splines after just 14K miles using what the shop mechanic thought was 'good enough':
I think I get what you're saying Jim, but I think you're exaggerating too far in the other direction. There is some machining tolerance, but notice how the splines are ramped, not square. As the wheel fits into the drive unit, the small machining tolerances are taken up by the two ramped surfaces mating together with the film of moly paste between them, so all the surfaces are going to have similar (but not identical) mating areas. I wouldn't go so far as to say they are all identical, but I think the machining tolerances are better than you're suggesting with your worst case assumption. It may also be possible that there's just enough metal flex under load to absorb those tiny mating differences so that all splines are reasonably well loaded.
