As a general rule, the diameter of the orifice for the abrasive nozzle should be approximately three times the water nozzle orifice.
Some people would suggest using a smaller ratio, about 2.5 times. Using a smaller ratio does produce faster cutting speeds. The trade-off is increased nozzle wear and costs. Part tolerance will suffer because of the increased speed of nozzle wear.
The following is a quick reference guide for the most common orifices for abrasive waterjet cutting. Typical abrasive amounts and water flow are also shown for easy reference.
Orifice (inches) | Abrasive Nozzle (Inches) | Abrasive Flow (lbs/min) | Water Flow @ 60 kpsi (GPM) |
---|---|---|---|
0.01 | 0.03 | 0.65 to 0.7 | 0.51 |
0.011 | 0.03 | 0.8 | 0.62 |
0.012 | 0.03 | 0.9 to 1.0 | 0.73 |
0.013 | 0.04 | 1.4 | 0.86 |
0.014 | 0.04 | 1.4 | 1 |
0.015 | 0.04 | 1.5 | 1.14 |
0.016 | 0.04 | 1.6 | 1.3 |
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