Ok so im going through the Maya 4.5 Savvy Book and i am on the skeleton/joints section. Im going through one of the tutorial and it was telling me to select the Forearm joint which I created and to try rotate it on the Z axis..So i press E to rotate the selected joint but its rotating really weird. Its rotating like a screw on the Z axis and it says on the book its supposed to reach a certain number but it never gets there...THEN i try to rotate it by using the channel box and it works..

Im just confused why in joints its different when you rotate using the E tool and why its different in the channel box.

Can someone explain?

Thanks.