• Life – 10 ~ 300 hours.

• Environmental load is rather high.

Explanation: In Abrasive Jet Machining (AJM), abrasive particles are made to impinge on the work material at a high velocity. The high velocity abrasive particles remove the material by micro-cutting action as well as brittle fracture of the work material.

Explanation: The depth of penetration varies inversely with the stand-off distance. In AJM, generally, the abrasive particles of around 50 μm grit size would impinge on the work material at a velocity of 200 m/s from a nozzle of I.D. of 0.5 mm with a stand-off distance of around 2 mm.

Explanation: In AJM, air is compressed in an air compressor and compressed air at a pressure of around 5 bar is used as the carrier gas. Gases like CO2, N2 can also be used as carrier gas which may directly be issued from a gas cylinder. Generally, oxygen is not used as a carrier gas.

Explanation: The abrasive particles enter the chamber from a hopper through a metallic sieve. The sieve is constantly vibrated by an electromagnetic shaker. The mass flow rate of abrasive (15 gm/min) entering the chamber depends on the amplitude of vibration of the sieve and its frequency. The abrasive particles are then carried by the carrier gas to the machining chamber via an electro-magnetic on-off valve.

• Impingement Angle : 600 ~ 900.

• Mass flow rate – 2 ~ 20 gm/min.

(iv) For ductile material, removal volume is assumed to be equal to the indentation volume due to particulate impact.

• Micro-machining of brittle materials.