Machining & Machine Tool Lab

(ME691)

Credit: 02

Lecture by:

M K PODDAR

PhD(Pursuing)Contacts:

Mail: pod.manoj@gmail.com

Web: http://www.ajourneywithtime.weebly.com/

Lab Contents

• Introduction

1. Producing a cast iron vee – block by machining

2. Study of chip formation ( type, color & thickness ) in turning mild steel

and evaluation of role of variation of cutting velocity and feed on chip

reduction coefficient /cutting ratio and shear angle

3. Measurement of cutting forces (Pz and Px or Py ) in straight turning at

different feeds and velocities different feeds and velocities

4. Measurement of surface roughness in turning under different conditions

5. Measurement of average cutting temperature in turning under different

speed – feed combinations

6. Measurement of tool – wear and evaluation of tool life in turning mild

steel by HSS or carbide too

7. Geometrical and kinematic test of a centre lathe or a drilling machine

8. Production of a straight toothed spur gear from a cast or forged disc

IntroductionMachining :

• The process of removing material from a work piece in the form of chips

• A machining process requires a cutting tool & a machine tools

Machining ProcessesMachining Processes

• Turning

• Milling

• Drilling

• Shaping / Planing

• Grinding

Layout of lathe m/c tool

Exp 01: Producing a mild steel vee – block

by machining

• Aim: To Producing a mild steel vee – block by

machining using Shaping Machine Tool

• Tool Required: Tool Holder, Shaping Tool, Centre

punch, Hammerpunch, Hammer

• Material Required: Mild Steel workpiece

• Instrument Required: Steel rule, vernier caliper,

vernier height gauge, depth gauge, try square

• Shaping Machine Tools: Figure & description

Exp 01 continue…• Procedures & Calculation:

1. Workpiece of required dimension to be cut on power hack saw

2. The job is fixed in vice of shaper machine

3. Top surface is machined first

4. The job surface is inverted and clamped tightly in the vice.

5. All the remaining surfaces are machined in sequence

6. Then marking is done as per the drawing for making groove of Vee shape

6. Then marking is done as per the drawing for making groove of Vee shape

7. The groove is machined using round nose cutting tool

8. For making the groove feed to the table and tool is given simultaneously

9. The groove is shaped in different cut to achieve the desired depth

figure and dimension of V-Shape groove

Exp 01 continue…

• Precautions:

1. work piece should be firmly gripped in the vice

2. adjust the stock length as per job

3. do not over speed or over cut the machine during 3. do not over speed or over cut the machine during

operation

4. hand gloves apron and shoes must be used while

working

• Conclusions

Vee- Block

• Vee block usually

in a couple are

made of cast iron or

mild steel

• They are generally• They are generally

used for holding

circular workpiece

for making out or

machining during

milling or drilling

• V-Blocks come in

many different

sizes.

References

THANK YOU