Drilling, Tapping and Reaming Lab Experiment

Aim

To perform the drilling, Boring and Reaming in a drilling Machine on the given work piece for the given dimensions.

Material RequiredMild steel Plate of Length 50x50 mm

Tools Requiremed

1. Steel rule,
2. Flat file (rough and smooth),
3. Drill bit (8 mm, 10 mm, 10.5 mm),
4. Reaming tool,
5. Try square

Procedure

1. The work piece was fitted in the vice and filed to the required dimensions.
2. The squareness of the work piece was checked.
3. Drawing punches were made for various drills.
4. The job was fitted on the radial drilling machine.
5. The 10 mm & 8 mm drill bit were used for drilling in the required place and drilling operation was made on the work piece.
6. Boring was done on the 10mm hole using the boring tool.
7. Reaming was done on the 8 mm hole using the Reaming tool size of 8 mm diameter.
8. The work piece was removed from the radial drilling machine.

Before Machining

After Machining

All dimensions are in mm

Result:

Thus the work piece for the required dimensions is obtained by performing drilling, Boring and Reaming in a drilling Machine.

Viva Questions

What is meant by drilling?

Ans: Drilling is the process of producing hole on the work piece by using a rotating cutter called drill.

Mention any four specification of drilling machine?

Ans. 1. Maximum size of the drill in mm that the machine can operate

2. Table size of maximum dimensions of a job can mount on a table in square meter

3. Maximum spindle travel in mm

4. Number of spindle speed & range of spindle speeds in r.p.m.

List any four machining operations that can be performed on a drilling machine?

Ans. 1. Drilling

2. Counter sinking

3. Tapping

4. Trepanning

What are the different ways to mount the drilling tool?

Ans. 1. fitting directly in the spindle

2. By using a sleeve

3. By using a socket

4. By means of chucks

What is the function of cutting fluids?

Ans. 1. It is used to cool the cutting tool & the work piece.

2. It improves the surface finish as stated earlier.

3. It causes the chips to break up into small parts.

4. It protects the finish surface from corrosion.

5. It prevents the corrosion of work & machine.

What are the properties of cutting fluid?

Ans. 1. High heat absorbing capacities.

2. It should have good lubricant properties.

3. High flash point.

4. It should be odourless.

5. It should be non-corrosive to work & tool.