The core philosophy of the book is simple: Engineers should not waste precious time re-calculating standard material properties or re-deriving gear tooth dimensions. Instead, they should have instant access to validated tables, charts, and codes.
When you are doing preliminary design (sizing a motor shaft before you even open CAD), flipping through Mahadevan is faster than navigating a software menu. Furthermore, competitive exams like and IES expect you to know where to find data, not just how to simulate it. design data handbook k mahadevan pdf