Written by Techni’s Service Staff

tips

SAPPHIRES vs DIAMONDS – Which one performs best?

The orifice is one of the most important components on the Waterjet system because it plays a key role in terms of edge quality of the cut, and component life.

ALIGNMENT ON DIAMOND ORIFICES
Pre-aligned diamond orifices are manufactured by aligning the diamond with an extremely high-pressure stream of water to a target then machining the OD of the orifice to suit. This insures the orifice will direct the stream of water straight down the centre of the nozzle and centre of the focusing tube so the wear insert and focusing tube wear evenly and round, resulting in longer insert, focusing tube life and maximum efficacy of the cutting head.

If the orifice is slightly misaligned this will create turbulence , wasting energy that would otherwise be used for cutting, significantly affecting the edge quality of the cut, requiring slower cutting speeds, increased pressure and more garnet to compensate. Turbulence will also reduce the affective life of both the wear insert, and focusing tube.

DIAMOND SAPPHIRE
Most diamonds do not fail because of damage to the jewel they fail because the matrix material around the jewel erodes away. The stainless steel tapered sides are damaged due to leaking between the orifice and the nozzle tube, typically caused by poor installation. Deposit build up around the orifice due to poor water quality, can also affect the quality of the stream, but this can be fixed with an ultra-sonic cleaner. Sapphire orifices can be chipped by particles in the water, particles a diamond can tolerate. A sapphire orifice maybe damaged by the water the very first second it is used or it might last 50 hours; there is no way of knowing how long they will last. And a damaged sapphire can destroy the wear insert and focusing tube in minutes.
LIFE SPAN 1000 hours on average LIFE SPAN 50 hours on average

Adantages of Diamond orifices
The diamond material is much stronger than the sapphire material
• More focused stream due to a far superior pre-alignment process
• Less turbulence giving faster cutting speeds and better finishes
• Reduce costs of consumables and maintenance
• Reduced machine down time while changing orifices