Exercise - 1

Turret and capstan lathe

Machining of typical component. — External V- Thread cutting

Aim :To perform step turning and thread cutting operations on capstan lathe according to

the given dimensions.

Tools required:

Single point cutting tool, Vernier caliper

Material Given :

Mild Steel bar of diameter 16 mm and length/60 mm

Steps :

I. Facing

2. Plain Turning

3. Step Turning

4. Chamfering

5. Thread cutting

Machine used :

Turret and capstan lathe

Procedure :

Given work piece is turned according to the given dimensions by performing operation like

turning and thread cutting by using turret Indexing tool head.

1. Fix the work piece in the collect chuck.

2. Perform facing and plain turning operations

3. Perform chamfering operation

4. Perform thread cutting operation

Result :: The work piece is machined according to the given dimensions on Turret and capstan

lathe.

Exercise - 2

Turret and capstan lathe

Machining of typical component. — External V- Thread cutting

Aim :To perform step turning and thread cutting operations on capstan lathe according to

the given dimensions.

Tools required:

Single point cutting tool, Vernier caliper

Material Given :

Mild Steel bar of diameter 16 mm and length/60 mm

Steps :

I. Facing

6. Plain Turning

7. Step Turning

8. Chamfering

9. Thread cutting

Machine used :

Turret and capstan lathe

Procedure :

Given work piece is turned according to the given dimensions by performing operation

like turning and thread cutting by using turret Indexing tool head.

1. Fix the work piece in the collect chuck.

2. Perform facing and plain turning operations

3. Perform chamfering operation

4. Perform thread cutting operation

Result ::

The work piece is machined according to the given dimensions on Turret and

capstan lathe.

Exercise – 3

SURFACE GRINDING

A i m : T o p e r f o r m s u r f a c e g r i n d i n g o p e r a t i o n t h e s u r f a c e g r i n d i n g m a c h i n e

according to the given dimensions.

Tools required :

Try square, Vernier caliper,

' Materials required :

Mild steel square bar of side I2mm and length160 mm

Sequence of operations :

Perform surface grinding operation on all four lateral surfaces one after

the other.

Procedure :

1. Fix one surface of the work piece on the magnetic table.

Give small depth of cut by rising the table.

2. Feed the work piece slowly against the rotating grinding wheel.

3. Repeat the steps (2) and (3) until all the lateral surface of the work

piece is -luniformly finished according to the given dimensions.

Result:

Surface grinding is done according to the required dimensions by

performing surface grinding operation on the given work piece.

Execerise-4 Gear hobbing — External spur gear

AIM:To cut teeth of a spur gear on gear hobbling machine.

Tools required : Milling cutter of 3 mm module, Vernier caliper

Material Given : Cast iron gear blank

Steps :According to gear blank diameter and given module of the cutter, calculate the

number of -teeth.

Procedure

1. From the standard table (number of teeth Vs. gear train values), select proper gear

train values (no. of teeth on driver and no. of teeth on driven) according to the

calculated number of teeth on spur gear.

2. The hob is set with its teeth parallel to the axis of gear blank.

3. Now fix the work piece on the rotating table.

4. Switch on the machine and depth of cut to the work piece is given manually against

the rotating hobber.

5. After generating the teeth on the job for the given first pass, give the second and

final depth of cut to the job to generate the complete teeth with required

specifications.

6. Remove the job and check for the dimensions.

Calculation : (gear hobbing)

D=m(Z+2)

When

D =Outer Diameter (measured from the given gear blank) in = 2.117

mm (cutter module)

Z = No. of teeth is to be cut

Depth of Cut = (2.25) m

= 2.25 x 2.117 = 4.76 mm

Result: Spur gear is machined on gear hobing machine as per the required specifications

Execerise-5

Shaping — cutting key ways

AIM : To perform the horizontal and angular machining as per the given dimension.

Tools required : Dot punch. Hammer, Spirit level. Square — Tool, Steel rule, Scriber

specification of Shaper :

1. Maximum length of the stroke

2. Size of the table (ie, Length , width, and depth of the table )

3. Maximum horizontal and vertical travel of the table

4. Maximum number of strokes per minute

5. Type of mechanism.

6. Power of the drive motor

operation performed: Machining of vertical surface, angular surface, horizontal -

surface, curved surface, irregular surface, slot and key way.

material given : Cast Iron Block — 60 x 60 x 60 mm.

sequence of operation:

1. Marking

2. Punching

3. Shaping

4. Key way machining

Procedure :

1. Apply chalk on the two adjacent surfaces.

2. Mark the given dimensions on the work piece.

3. Punch the marked lines.

4. Fix the work piece in the machine wise and check for horizontal

surface..

5. Fix the Square -tool in the tool holder.

6. Feed the tool and move the table from left side to right side

7. Increase the depth of cut and repeat step 6

8. perform the horizontal machining and Key way machining as per

the given dimension.

Result..

The given cast Iron block is machined according to the given

dimensions.

Exercise – 7

CYLINDRICAL GRINDING

Aim : To perform Cylindrical grinding operation on the cylindrical grinding machine

according to the given dimensions.

Tools required : Single point cutting tool, Vernier Caliper, Dogs, Centre drill bit.

Material Given: Mild steel bar of diameter 25 mm and length 50 mm

Sequence of erations

1. Facing

2 . P l a i n t ur n i ng

3. chamfering

4 . Counter - s i nki ng

5. Cylindrical grinding

Procedure :

I. The given work piece is turned according to the given dimensions by

performing operations like facing and plain turning.

1. Fix the center drill bit in tailstock and perform counter sinking on both

sides. . Work piece is chamfered on both sides.

2. . Fix the work piece on the cylindrical grinding and perform finishing

operation , according to the given tolerance.

Result:

Cylindrical grinding is done according to the required dimension and tolerance by

performing turning and cylindrical grinding operations on the given work piece.

Exercise No. 8

GROOVING & KNURLING

Aim: To perform grooving and knurling in lathe

according to given dimensions

Tools required: Cutting tool, Vernier caliper, etc.,

Material: Mild steel rod- 025mm x 100mm

Sequence of operations:

a. Marking

b. Facing

c. Turning

d. Grooving Knurling Procedure:

1. Apply chalk on the surfaces.

2. Mark the given dimensions on the work piece.

3. Fix the work piece in the chuck.

4. Fix the cutting tool in the tool post.

5. Feed the tool and machine the job to the required dimensions.

6. Fix the grooving tool and carry out grooving.

7. Then carry out knurling operation.

8. Perform the chamfering operation, according to the given dimensions.

Result:

The work piece is machined to the required dimensions. Grooving and knurling operations

are carried out.

Exercise 9

DRILLING

Aim: To perform drilling operation in lathe machine

according to given dimensions

Tools required: Cutting tool, Vernier caliper, drill bits etc.,

Material: Mild steel rod- 025mm x 100mm Sequence of operations:

1. Marking

2. Facing

3. Turning

4. Centre

5. tapping

6. Drilling

Procedure:

1. Apply chalk on the surfaces.

2. Mark the given dimensions on the work piece.

3. Fix the work piece in the:chuck.

4. Fix the cutting tool in the tool post.

5. Feed the tool ind machine the job to the required dimensions.

6. Fix the drill bit securely in the tailstock,

7. Give feed through tailstock and machine hole in the work piece to the given

dimensions.

8. Perform the chamfering operation, according to the given dimensions.

Result:

The work piece is machined to the required dimensions. Hole is

produced in the work piece by drilling.

Exercise No. 10

EXTERNAL THREAD CUTTING

Aim: To perform external threading in lathe according

to given dimensions

Tools required: Cutting tool; vernier caliper, etc.,

Material: Mild steel rod- 025mm x 100mm

Sequence of operations: Marking

Facing

Turning

Thrcad cutting

Formula: Core diameter, d = Major diameter — (2xdepth)

Depth = 0.6495 x pitch

Procedure:

1. Apply chalk on the surfaces.

2. Mark the given dimensions - on the work piece.

3. Fix the work piece in the headstock spindle.

4. Machine to required dimensions

5. Set the change gear

6. Fix the threading tool in the tool post.

7. Adjust speed for threading

8. Engage half nut to any one number on the thread chaser

9. Depth of cut is given through cross slide

10. After the tool has produced a helical groove to the required length

withdraw the tool and disengage half nut

11. Move the carriage to the starting position and engage half nut.

12. Repeat till required depth of thread is obtained.

13. Perform the chamfering operation, according to the given dimensions.

Result:

The work piece is machined to the required dimensions by performing external thread

cutting.