L.G.Balakrishnan & Bros NPD Engineer Interview Questions and Answers

Process flow of a part with its drawing involves defining the steps required to manufacture the part as per the drawing.

• Identify the raw materials required for the part

• Define the manufacturing processes involved in creating the part

• Determine the quality checks required at each step

• Ensure compliance with safety and regulatory standards

• Document the process flow for future reference

• Example: Process flow for manufacturing

A CNC machine with high precision cutting tools.

• A CNC machine with high precision cutting tools can achieve a tolerance of 50 microns.

• The cutting tools should be regularly maintained and calibrated to ensure accuracy.

• The material being cut should also be of high quality and uniform thickness to achieve the desired tolerance.

• Other factors such as cutting speed, feed rate, and coolant should also be optimized for the spe

The necessary documents, equipment, and training must be handed over during serial production.

• Documentation such as work instructions, quality control plans, and inspection reports

• Equipment and tools required for production

• Training materials and sessions for operators and maintenance personnel

• Product samples for quality control purposes

• Any necessary certifications or regulatory approvals

• Maintenance and troubleshooting

Draft angle is the angle of the vertical wall of a mold or part, while shutoff is the point where two mold halves meet to prevent material flow.

• Draft angle is necessary for easy ejection of parts from molds.

• Shutoff is crucial for preventing material leakage and ensuring part accuracy.

• Draft angle is typically around 1-3 degrees, while shutoff is a precise meeting point of mold halves.

• Examples: Draft angle - plastic inje

Plastic defects are imperfections in plastic materials that can affect their performance and appearance. Regulations ensure safety and quality standards are met.

• Plastic defects can include air bubbles, warping, sink marks, and flow lines

• Regulations such as RoHS and REACH restrict the use of certain chemicals in plastics

• Defects can be minimized through proper material selection, processing techniques, and quality contro