In abrasive jet machining, as the distance between the nozzle tip and the work surface increases, the material removal rate

Explanation:

• In AJM, the material removal takes place due to the impingement of the fine abrasive particles.
• These particles move with a high speed air (or gas) stream.
• When an abrasive particle impinges on the work surface at high velocity, the impact causes a tiny brittle fracture.
• The following air (or gas) carries away the dislodged small workpiece particle.

Effect of nozzle tip distance on MRR

• When the nozzle tip distance increases, the velocity of abrasive particles impinging on the work surface increases due to acceleration after they leave the nozzle. This, in turn, increases the MRR.
• With a further increase in nozzle tip distance, the velocity reduces due to the drag of atmosphere which initially checks the increase in the MRR and finally decreases it.