This document discusses abrasive jet machining (AJM), including its objectives, construction, working principle, applications, advantages, and disadvantages. AJM works by using compressed gas to propel abrasive particles at high velocity towards a workpiece, eroding material. It can machine heat-sensitive, brittle, thin, or hard materials. The key components are a compressor, mixing chamber, nozzle, and exhaust. Applications include cutting, drilling, boring, trimming, and surface finishing. Advantages include the ability to machine heat-sensitive materials and reach inaccessible areas, while producing a high surface finish, with low heat and cost. Disadvantages include a low material removal rate and inability to reuse abrasive particles.

1. ABRASIVE JET MACHINING
OBJECTIVES OF THIS PRESENTATION
• TO LEARN THE WORKING PRINCIPLE
• CONSTRUCTION
• WORKING AND APPLICATIONS
• ADVANTAGES AND DISADVANTAGES
• CONCLUSION
Group Presenters
 Hassnain Faisal (255-CH-2020)
 Mubeen Ahsan (273-CH-2020)
 Arslan Sheraz (229-CH-2020)
 Fahad Naeem (253-CH-2020)

2. 2
Abrasive jet machining
Abrasive jet machining, also known as
abrasive micro-blasting, pencil blasting
is an abrasive blasting machining
process that uses abrasives propelled
by a high velocity gas to erode material
from the workpiece. Common uses
include cutting heat-sensitive, brittle,
thin, or hard materials.
Abrasive jet machine or AJM works on the basic principle of Abrasive erosion. If
the high velocity abrasive particles strike on a hard or brittle work piece It tends
to remove some metal on striking surface or Workpiece .
Abrasive particles :
• Aluminum oxide
• Silicon carbide
• Boron carbide
• Diamond dust particles
Size of particles :
• Size of abrasive particles
is about 10 to 40 microns
or 0.001 inch to 0.025mm
Principle

3. Construction
• Compressor
• Air filter
• Pressure Gauge
• Mixing chamber
• Vibrator
• Foot control Valve
• Nozzle
• Exhaust
• Hood
Working
Compressor :Gas supplied through the compressor
Air Filter : Remove the Dust particles , Moisture and impurities
Pressure Gauge : Tells the exact pressure of the compressed gas and check the pressure is in the required amount or
not . Usually it compressed to the pressure of 25 to 130 psig
Mixing Chamber :Compressed AirAnd Abrasive particles are mixed in this chamber it is also called Powder supply
chamber
Vibrator :Use to Mix the Highly compressed air with the abrasive particles

4. Foot Control Valve: As we already know that the purpose of the
valve is to control the Flow of Liquids or Gases and this type
of Valve is Controlled by the Foots.(fig 1)
Nozzle: It is part of AJM through which Abrasive Particles
will eject. So the Durability of Nozzle will be a matter.Usually
it is made from tungsten carbide or sapphire (fig 2)
(usually life - 300 hours for sapphire,
20 to 30 hours for Tungsten Carbide).
Nozzle of diameter 0.2 to 0.8 mm is used
Exhaust: It is used to capture the Abrasive Particles by creating a
little bit of Vacuum which will collect all the Particles
Hood: It is Personal Protective thing which is used to keep worker
safe from any Injury caused by striking Abrasive Particles
Hood
(fig 1)
(fig 2)

5. Purposes
 Cutting
 Drilling
 Boring
 Trimming
 Surface Finishing
 Engraving
Widely Used in
 Electronic Industry
 Aerospace
 Stainless steel

6. • ABRASIVE JET MACHINING-AJM
ADVANTAGES
HIGH
SURFACE
FINISH
MACHINE
HEAT
SENSITIVE
MATERIAL
MACHINING
INACCESSIBLE
PORTIONS
LOW COST
accurate
LOW HEAT
PRODUCTION
MODERN
Process
control
flexibility
THERMALLY
ADVANCED

7. • ABRASIVE JET MACHINING-
AJM:
 DISADVANTAGES:
Low metal
removal rate
ABRASSIVE
PARTICLES
CANNOT BE
REUSED
PRODUCES
TAPERED CUT
CANNOT USE FOR
MACHINING
SOFT,DUCTILE
MATERIALS
LIMITED
NOZZEL LIFE
MODERN
LIMITED NOZZEL LIFE
1
2

9. ANY QUERIES ?
THANK YOU