Flow International Mach 100b Waterjet Cutting System
Key Specifications
Cutting Area
Pump Pressure
Pump Power
Max Cutting Thickness
Positioning Accuracy
Cutting Speed
Overview
The Flow Mach 100b is Flow International's entry-level production waterjet cutting system, designed to bring the company's proven UHP waterjet technology to job shops, fabricators, and manufacturers with moderate throughput requirements. The Mach 100b delivers a practical cutting envelope in a compact footprint, making it accessible for operations transitioning from plasma or laser to waterjet without requiring a full shop expansion. The machine is built on the same rigid X-Y bridge architecture as Flow's larger platforms, ensuring consistent part quality and long-term positional accuracy.
Powered by a 50 HP pump delivering pressures up to 60,000 PSI, the Mach 100b cuts steel, aluminum, titanium, glass, ceramic, stone, and composites without generating heat-affected zones. The integrated abrasive delivery system meters garnet at consistent rates, and the standard cutting head accepts Flow's optional Dynamic Waterjet taper-compensation upgrade for improved edge quality on thick cuts. The machine ships with FlowMaster software, Flow's purpose-built CAM and control platform, which handles nesting, tool path generation, and automatic pressure ramping.
The Mach 100b is particularly well-suited for small-to-medium fabrication shops that need to cut a wide variety of materials on a single platform. Its simplified setup, single pump configuration, and intuitive FlowMaster interface reduce the learning curve for operators new to waterjet. Standard features include a stainless-steel tank, slat catcher system for abrasive collection, and a Z-axis with collision sensor for automatic height sensing on uneven stock.
With a competitive price point among brand-name UHP waterjet systems, the Mach 100b is a common first production waterjet for shops upgrading from manual or plasma cutting. Flow's extensive North American dealer and service network supports the machine with on-site installation, operator training, and rapid access to wear parts.
Full Specifications
| Parameter | Value |
|---|---|
| Cutting Area | 1,500 × 3,000 mm (5×10 ft) standard |
| Pump Pressure | 60,000 PSI (4,137 bar) |
| Pump Power | 50 HP (37 kW) |
| Max Cutting Thickness | 150 mm (6 in) on steel; up to 300 mm on soft materials |
| Positioning Accuracy | ±0.076 mm (±0.003 in) |
| Cutting Speed | Up to 1,000 mm/min depending on material and thickness |
| Control System | FlowMaster CAM/CNC software |
| Machine Weight | Approx. 3,600 kg (7,900 lbs) |
Specifications sourced from flowwaterjet.com — verified 2026-03-28
Strengths & Limitations
Strengths
- Flow International brand reliability with proven UHP technology and strong service network
- FlowMaster software simplifies programming for operators new to waterjet
- No heat-affected zone — suitable for heat-sensitive metals, composites, and glass
- Compact footprint makes it practical for shops with limited floor space
Limitations
- 50 HP pump limits cutting speed on materials above 50 mm thickness compared to larger Flow models
- Abrasive garnet is a significant ongoing operating cost
- Single-pump configuration means downtime if pump requires maintenance
Best For
Frequently Asked Questions
01
The Mach 100b can cut mild steel up to approximately 150 mm (6 in) thick, though cut speed decreases significantly above 75 mm. For very thick plate production work, the higher-pressure Mach 500 or Mach 700 with 90,000 PSI pumps is recommended.
02
The standard Mach 100b uses a 3-axis cutting head. Flow's Dynamic Waterjet taper-compensation head can be added as an upgrade, providing active kerf-taper correction. Full 5-axis contour cutting is available on higher-end Flow platforms.
03
The primary consumable is garnet abrasive, typically consumed at 0.3–0.7 kg/min during cutting. Water filtration, nozzle wear parts (focusing tube, orifice), and pump seal kits are the other main recurring costs. Garnet alone typically runs $0.10–0.30 per minute of cutting time depending on purchase volume.
Community Discussions
Troubleshooting and problem-solving — Flow Waterjet having issues when turning on the abrasive. Jet ...Water jet recommendations? : r/Machinists - RedditFlow Waterjet troubleshooting : r/Machinists - RedditWaterjet piercing question : r/Machinists - RedditNeed help: waterjet or CNC mill for educatio
Owner experience and review — Water jet recommendations? : r/Machinists - Reddit
Troubleshooting and problem-solving — Flow Waterjet troubleshooting : r/Machinists - Reddit
Community discussion — Waterjet piercing question : r/Machinists - Reddit
Links to community discussions. Summaries are editorial — visit the original thread for full context.
