Product Name: Focusing Tube / Mixing Tube (Part No. 100100-20-3)

Description:
This component is a focusing tube, also known as a mixing tube or abrasive nozzle. It is a precision-machined cylindrical component manufactured from ultra-hard tungsten carbide and serves as the final exit point in the cutting head assembly of an abrasive waterjet cutting system . The designation 20 in the part number typically indicates a 0.020 inch (approximately 0.5 mm) inner diameter .

Inside the focusing tube, the ultra-high-pressure waterjet is mixed with garnet abrasive and focused into a coherent, high-velocity cutting stream. As the primary component subjected to abrasive erosion, it is classified as a high-wear consumable part.

Applications:

• Used exclusively in abrasive waterjet cutting machines to form and direct the abrasive-laden cutting jet onto the workpiece

• Installed in the cutting head assembly, positioned immediately downstream of the mixing chamber

• Suitable for cutting hard materials such as steel, stone, glass, ceramics, and composites

• Compatible with standard waterjet systems requiring 0.020 inch inner diameter configuration

Features:

• Tungsten Carbide Construction: Manufactured from premium-grade tungsten carbide providing exceptional hardness and wear resistance

• Precision-Ground Inner Diameter: Features a precision-honed bore for a straight, focused abrasive jet, ensuring clean, narrow kerf cuts

• Optimized Diameter Ratio: For optimal performance, the mixing tube inner diameter should be approximately three times the water orifice diameter (1:3 ratio)

• Sacrificial Consumable: The inner bore gradually erodes with use, directly affecting cut quality and accuracy

• Pressure Rating: Engineered to withstand operating pressures up to 60,000–90,000 PSI (approximately 4,137–6,200 bar)

Maintenance:

Failure Diagnosis:

• Reduced Cutting Performance: Slower cutting speeds, rougher edge finish, or increased taper indicate bore wear

• Asymmetric Wear: Uneven wear around the tube outlet circumference indicates misalignment between the water orifice and mixing tube

• Visible Bore Damage: Inspect the exit orifice for ovality, flaring, or visible bore enlargement

• Clogged Tube: Complete blockage may occur due to wet abrasive, foreign objects, or water backflow

Replacement and Optimization:

• Regular Replacement: Replace the focusing tube when cut quality degrades. Indexing the tube by 1/4 turn every 10–12 operating hours can distribute wear evenly and extend service life

• 1:3 Diameter Rule: Maintain a 1:3 diameter ratio between the water orifice and mixing tube (e.g., 0.010″ orifice with 0.030″ mixing tube) for optimal cutting efficiency

• Alignment Check: Ensure perfect coaxial alignment between the water orifice and mixing tube. Misalignment causes asymmetric wear and reduces tube life

• Water Quality Impact: Poor water quality with high hardness or contaminants accelerates tube wear . Maintain proper water filtration

• Abrasive Quality: Use clean, dry garnet abrasive. Wet or contaminated abrasive can cause clogging and accelerated wear

• Handling Caution: Tungsten carbide is extremely hard but brittle; handle carefully to avoid chipping or cracking during installation

• Full Depressurization: Always fully depressurize the waterjet system and follow lockout/tagout procedures before removing or installing the focusing tube