Yes, a single waterjet system can cut both 1-inch armor plate and 1/8-inch plastic sheets effectively. This versatility is one of the primary advantages of waterjet cutting technology. The same machine, pump, cutting head, and motion control system handle both extremes with appropriate parameter adjustments.

Cutting 1-inch armor plate requires abrasive waterjet operation. The pump must deliver pressure between 50,000 and 60,000 psi. A 0.014 inch or 0.015 inch water orifice paired with a 0.040 inch mixing tube is typically used. This combination provides sufficient water volume and abrasive flow, approximately 1.0 to 1.5 pounds per minute of garnet, to erode through thick, hardened steel. Cutting speed for 1-inch armor plate is relatively slow, typically 2 to 5 inches per minute depending on the exact hardness and desired edge quality. The abrasive does the work, mechanically eroding the metal.

Cutting 1/8-inch plastic sheets requires a completely different setup. Abrasive is not needed and is actually detrimental. Pure water cutting is used. The pump pressure can be reduced, often to 10,000 to 30,000 psi, though many operators simply use full pressure with a pure water nozzle. The orifice size may remain the same or be slightly larger. No mixing tube is used. Instead, a pure water cutting nozzle focuses the jet. Cutting speed for thin plastic is extremely high, typically 200 to 500 inches per minute or more. The plastic cuts cleanly with a melted or fused edge because the water jet produces minimal heat. Acrylic, polycarbonate, polyethylene, and other common plastics cut without cracking or melting distortion.

Switching between these two applications on a single system takes only a few minutes. The operator removes the abrasive mixing tube and installs a pure water nozzle. The abrasive feed system is turned off. The water pressure may be adjusted downward for thinner plastics to reduce splashing. To return to armor plate cutting, the operator reinstalls the mixing tube and turns on the abrasive feeder. No other hardware changes are required.

Several considerations apply. The waterjet table must be large enough to accommodate both part sizes. The cutting bed, typically a slatted tank or grating, supports both heavy steel plates and lightweight plastic sheets. For thin plastics, a submerged cutting technique or a supportive mesh screen prevents the material from lifting or shifting during cutting. A vacuum table or adhesive film may be used to hold thin sheets flat.

Edge quality differs between materials. Armor plate cut with abrasive waterjet has a slightly tapered edge, typically 0.002 to 0.005 inches per side, with a matte, sandblasted finish. Plastic cut with pure water has a smooth, sharp edge with no delamination or burrs.

A single waterjet system with a 50 or 100 horsepower pump handles both tasks without compromise. The same machine that produces structural armor components in the morning can switch to cutting delicate plastic gaskets or electronic enclosures in the afternoon. This flexibility makes waterjet a practical choice for job shops, research facilities, and manufacturing operations that process diverse materials.