Limit rotate object?

Questions & Answers
1

how to limit when object rotate

var arm : Transform;

..

if(Input.GetKeyDown(KeyCode.B))
arm.Rotate (0, 0, 6);

if object rotate at z axis 90 degrees stop?

2

Add a check to see if the rotation is less than 90 degrees before you rotate.

if(Input.GetKeyDown(KeyCode.B) && arm.eulerAngles.z <90)
arm.Rotate (0, 0, 6);