Sherman CUTTER 90 plasma cutter, 85 A, 400 V

Sherman CUTTER 90 is a IGBT plasma cutter for steel, aluminium, copper and other electrically conductive metal workpieces. Its 30–85 A adjustable current allows the setting to be matched to material, thickness and travel speed.

The machine uses a three-phase 3 × 400 V, 50 Hz supply. The maximum stated cutting thickness is 30 mm and the rated duty cycle is 85 A / 60%. An external compressed-air source is required.

Torch and arc ignition

The A-81 torch with a 6 m lead uses HF high-frequency ignition with a pilot arc. Select consumables for this torch type and operating current; the lead provides working distance from the power source.

Controls and air test

2T/4T modes provide a choice of torch-trigger operation for short or longer cuts. The TEST function checks and purges the air circuit before cutting. The built-in air preparation unit allows pressure to be adjusted and monitored from the front panel.

Compressed-air supply

The manufacturer brochure recommends compressor delivery of 250 l/min. The separate A-81 torch table in the manual specifies 160 l/min at 3.0–5.0 bar. Select the compressor by delivered airflow at working pressure; supply clean, dry air and allow for hose and filter losses.

Cutting limits and duty cycle

30 mm is the maximum stated thickness under optimum conditions; actual results depend on metal type, workpiece thickness, travel speed and torch consumable condition. Check the required cut quality on a sample. The 85 A / 60% duty cycle means 6 minutes of cutting followed by 4 minutes of cooling within a 10-minute cycle, under the manufacturer’s specified conditions.

Supplied equipment

• Plasma cutting machine
• A-81 plasma torch – 6 m
• Return cable with clamp
• Welding hand shield
• Chipping hammer with brush