Top 10 Questions for Lapping Machine Tender Interview

1. Explain the process of lapping a surface?

Lapping is a machining process that uses a loose abrasive suspended in a liquid to remove material from a surface. The abrasive particles roll between the workpiece and a lap, which is a flat or curved surface made of a hard material such as cast iron, steel, or diamond. The workpiece is held against the lap and moved in a circular or back-and-forth motion. The abrasive particles cut into the workpiece, removing material and creating a smooth, flat surface.

2. What are the different types of lapping machines?

Horizontal lapping machines

• The workpiece is held horizontally and moved back and forth across the lap.
• Used for lapping flat surfaces.

Vertical lapping machines

• The workpiece is held vertically and moved up and down across the lap.
• Used for lapping cylindrical surfaces.

Rotary lapping machines

• The workpiece is held in a chuck and rotated against the lap.
• Used for lapping both flat and cylindrical surfaces.

3. What are the key factors that affect the quality of a lapped surface?

• The type of abrasive
• The size of the abrasive particles
• The concentration of the abrasive in the liquid
• The speed of the lapping machine
• The pressure applied to the workpiece
• The duration of the lapping process

4. What are the common problems that can occur during lapping?

• Scratches
• Gouges
• Burnishing
• Warping
• Cracking

5. How can these problems be prevented?

• Scratches can be prevented by using a fine abrasive and applying light pressure.
• Gouges can be prevented by using a coarser abrasive and applying more pressure.
• Burnishing can be prevented by using a lubricant and lapping for a shorter period of time.
• Warping can be prevented by using a lap that is flat and parallel to the workpiece.
• Cracking can be prevented by using a lap that is not too hard.

6. What are the different types of abrasives used in lapping?

• Aluminum oxide
• Silicon carbide
• Boron carbide
• Diamond
• Cubic boron nitride

7. How do you select the right abrasive for a particular lapping job?

• The type of material being lapped
• The desired surface finish
• The speed of the lapping machine
• The pressure applied to the workpiece
• The duration of the lapping process

8. What are the safety precautions that must be taken when operating a lapping machine?

• Wear eye protection.
• Wear gloves.
• Use a dust mask.
• Keep the work area clean and free of debris.
• Follow the manufacturer’s instructions for operating the machine.

9. What are the maintenance procedures that must be performed on a lapping machine?

• Clean the machine regularly.
• Lubricate the machine regularly.
• Inspect the machine regularly for wear and tear.
• Replace worn parts as necessary.

10. What are the troubleshooting procedures for a lapping machine?

• If the machine is not cutting, check the abrasive and the pressure being applied to the workpiece.
• If the machine is making a lot of noise, check the bearings and the gears.
• If the machine is vibrating, check the balance of the workpiece.
• If the machine is leaking, check the seals.

Lapping Machine Tenders are responsible for operating and maintaining lapping machines, which are used to polish and finish surfaces of various products, including optical lenses, semiconductor wafers, and metal components.

1. Machine Operation

Operate lapping machines according to established procedures and specifications.

• Load and unload materials onto the machine.
• Adjust machine settings, such as speed, pressure, and coolant flow.

2. Quality Control

Inspect finished products to ensure they meet required specifications.

• Monitor machine performance and make adjustments as needed.
• Identify and correct any defects in the lapping process.

3. Maintenance and Repair

Perform routine maintenance on lapping machines.

• Clean and lubricate machines.
• Replace worn or damaged parts.

4. Safety and Compliance

Follow safety regulations and procedures.

• Wear appropriate safety gear, such as gloves and safety glasses.
• Maintain a clean and organized work area.

Preparing for a Lapping Machine Tender interview requires a combination of technical knowledge and a strong understanding of the industry. Here are some tips to help you ace the interview and land the job.

1. Research the Company and Role

Before the interview, thoroughly research the company and the specific role you are applying for. Visit the company’s website, LinkedIn page, and Glassdoor reviews to learn about their culture, products, and values. This will help you tailor your answers to align with the company’s needs and goals.

2. Highlight Relevant Experience

In your resume and interview, emphasize any previous experience operating or maintaining lapping machines or similar equipment. Quantify your accomplishments whenever possible using specific numbers or metrics. For example, instead of saying “I operated a lapping machine,” say “I operated a lapping machine for six years, producing over 1,000 polished lenses per month.”

3. Demonstrate Quality Control Expertise

Quality control is a crucial aspect of lapping, so be prepared to discuss your experience in this area. Explain the quality control procedures you have followed in previous roles and how you ensured that finished products met specifications.

4. Showcase Problem-Solving Skills

Lapping Machine Tenders often encounter problems with machines or materials. In the interview, provide examples of how you have identified and resolved issues. Highlight your ability to think critically, troubleshoot problems, and make informed decisions.

5. Emphasize Safety and Compliance

Safety is paramount in manufacturing environments. In the interview, emphasize your commitment to safety and compliance. Explain your understanding of safety regulations and how you maintain a safe work area.