How do you read this chart?

[TacoRunner]

   http://www.toyotasuperaxles.com/graph.html

   Here is Bobby Longs graph chart on his new 30 spline set.   Its as stong as a stock D60 at about 8000 ft.lbs but the bottom side of the chart reads 90 degrees of twist.  What does this mean?

[raybie]

not sure.  it looks like the degrees should be reversed maybe

[Rockcrawlintoy]

maybe degrees that he joint is turned

Drew

[mr4x42u]

Its basicly just tourqe and degreesof twist before failure..So if you look atthe chart the d-60 35 spline will bust at about 7900lbs of tourqe and will twist 44 degrees before it breaks..

the cromo long will bust at about 7800 lbs of touge and will twist 90% degrees befor it busts,,ever seen a twisted axle,,thats the twist there talking about.

[raybie]

so, if that is how you read it then a d-60 will break at 5500ftlb at 20 degrees of twist.    still not makin sense.

[CTENG in KS]

The chart is showing the degrees of twist and the corresponding torque input required to produce the twist.  The "break point" is at the end of the line, that is the point of plastic deformation of the material, i.e. the point at which, when unloaded, the axle will no longer return to its original shape.   

The fact that the Long will withstand more twist only means that the material is more maleable than that of the D60 shaft.  Their strength characteristics are similar, but the extra give in the material of the Longs will probably be easier on other components like the ring and pinion than the brittle D60 shaft would.

[raybie]

that is the point of plastic deformation of the material

should have remembered that form college.     for some reason i was thinking along the lines of turning degrees. 

[CTENG in KS]

Yay college!!!   

[mr4x42u]

so, if that is how you read it then a d-60 will break at 5500ftlb at 20 degrees of twist.    still not makin sense.

close but you go to the last dot with a circle,,so it would be closer to 7900lbs of tourqe and 44 degrees of twist..
the stub axles will twist under pressure..It takes tourqe to wist the stub axles,,so put the two together and when the stub axles has reached its max,,SNAP,,and thats the point higest on the chart with the circle,,failure point..It like reading a grid map,,you look at the degrees of twist,,and degrees of tourqe and viola,,,stub or birfeild failure..

[TacoRunner]

CTENG   thats a great explantion, that whole turning thing didn't jive with me.  Thanx dude