HI-FAB Engineers Mechanical Engg. Design Interview Questions, Process, and Tips

First angle and third angle projection are two methods used in engineering drawing to represent a 3D object on a 2D plane.

• First angle projection is commonly used in Europe and Asia, while third angle projection is commonly used in North America.

• In first angle projection, the object is placed in the first quadrant and the views are projected onto the planes behind the object.

• In third angle projection, the object is plac...read more

Fits refer to the range of tightness or looseness between two mating parts. It is used to ensure proper functioning and assembly of mechanical components.

• Fits are used to determine the amount of clearance or interference between two mating parts.

• They are classified into three types: clearance fit, interference fit, and transition fit.

• Clearance fit allows for free movement between the parts, interference fit creates a p...read more

GD&T stands for Geometric Dimensioning and Tolerancing. It is a system of symbols and rules used to specify the geometry of mechanical parts.

• GD&T is used to communicate design intent and ensure parts are manufactured to the correct specifications.

• Some common symbols used in GD&T include concentricity, perpendicularity, and flatness.

• GD&T can also be used to specify tolerances for features such as size, position, and ori...read more

Shaft basis and hole basis are two systems used to determine the tolerance limits of mating parts in mechanical design.

• Shaft basis system: The shaft is kept constant and the hole is varied to achieve the desired fit.

• Hole basis system: The hole is kept constant and the shaft is varied to achieve the desired fit.

• The system chosen depends on the application and the desired level of clearance or interference between the ma...read more

K factor is a ratio that represents the location of the neutral axis in relation to the thickness of the sheet metal.

• K factor is used in sheet metal bending to determine the amount of bending force required.

• It is a ratio of the distance from the neutral axis to the inside bend radius over the material thickness.

• Different materials and bending processes have different k factors.

• K factor affects the accuracy of the flat ...read more