This document discusses non-traditional machining (NTM) processes. It defines NTM as processes that cut material using mechanical, thermal, electrical, or chemical energy without sharp cutting tools. NTM can machine extremely hard, brittle, or complex materials. The document classifies NTM into mechanical, electrochemical, electro-thermal, and chemical processes. It provides details on electrical discharge machining (EDM) and abrasive jet machining (AJM) processes, including their working principles, advantages, and disadvantages.

1. A SEMINAR ON
Presented By,
SHRINIVAS KUMBHAR
ME5G (B)

2.  What is ntm process.
 Characteristic of ntm.
 Need of ntm processes.
 Advantages of ntm process
 Classification of ntm.
 Edm process.(Working , setup, adv/disadv )
 Ajm process. .( Working , setup, adv/disadv )

3.  Non traditional machining process
It is defined as a group of process that cut material
by utilizing mechanical, thermal ,electrical , or
chemical energy or combination of these energies but
do not use a sharp and hard cutting tools as required
for traditional manufacturing process.

4.  Extremely hard and brittle materials or Difficult to machine materials are
difficult to machine by traditional machining processes.
 When the workpiece is too flexible
 When the shape of the part is too complex.
 Machining of composites.
 To fulfill the requirements of low stress grinding .

5.  In NTM, there may not be a physical tool present.
 In NTM, the tool need not be harder than the work piece
material.
 Mostly NTM processes do not necessarily use mechanical
energy to provide material removal.

6. • Any material can be machined irrespective of its hardness.
• Any complicated shapes can be produced on the workpiece.
• Very fine holes can be easily drilled.
• No mechanical process exerted on workpiece.
• Drilling of tapered holes is possible.

7. Classification of NTM processes is carried out depending on the nature
of energy used for material removal :
1. Mechanical Processes :
• Abrasive Jet Machining (AJM)
• Ultrasonic Machining (USM)
• Water Jet Machining (WJM)
• Abrasive Water Jet Machining (AWJM)
2. Electrochemical Processes :
• Electrochemical Machining (ECM)
• Electro Chemical Grinding (ECG)
• Electro Jet Drilling (EJD)
3. Electro-Thermal Processes :
• Electro-discharge machining (EDM)
• Laser Jet Machining (LJM)
• Electron Beam Machining (EBM)
4. Chemical Processes :
• Chemical Milling (CHM)
• Photochemical Milling (PCM)

9.  It is also known as Spark initiated discharge machining as well as Spark
erosion machining
 It is probably most versatile of all electrical machining method.
 The metal removal takes place due to erosion caused by the electric spark.
 This process can apply on any material irrespective of its hardness, which is
an electrical conductor

11.  Edm works on the principle that the heat energy generated
from spark is used for removing material from workpiece.
 In this spark gap is maintained of about 0.01 to o.5 mm.
 The tool & w/p both are I dielectric fluid.
 As supply switch on thousands of spark produced in spark gap
and material removes from the w/p.

12.  Any material can be machined irrespective of its hardness.
 Any shape that imparted on the tool can be reproduced on work
piece.
 No physical contact between tool and w/p. Therefor no stresses on
w/p.
 Harder material can be machined at faster rate.
 Good surface finish can be obtained.

13. Work piece should be good electrical conductor.
Power consumption is high.
Material removal rate is slow.
The wear rate of tool electrode is more.

14.  In AJM process material removes from workpiece with the help
obrasive particles.
 The process consist a mixture of fine abrasive particle and gas
at high pressure(N & Co2)
 The mixture directed on w/p at very high pressure then
material remove from the workpiece

16. Advatages :
Brittle material of thin section can be easily machines.
Low initial investment.
No direct contact between tool and workpiece.
Highly sensitive material like Glass & Paraffin can easily machined
Disadvantages:
Low metal removal rate.
Once used abrasive particles cannot be used.
Not suitable for machining of ductile material.
Machining accuracy is poor

17.  It is used for drilling holes, cutting slots, cleaning hard surfaces.
 Machining of semi conductors.
 Machining of brittle materials glass and ceramics etc.
 Use for surace finishing purpose for hard material.