- Use electrode to full life: A fully used SilverLine® electrode will have a pit depth of 2.5 mm (.100"). Standard electrodes only achieve a pit depth of 1.3 mm (.050").
- Properly tighten the nozzle retaining caps: Make sure both the retaining caps are sealed tightly against the nozzle to prevent leaking.
- Purge torch: After each parts change, purge the torch for at least 30 seconds to remove residual moisture.
- Leak check: After purging the torch, make sure all o-ring seals are tight and there are no torch coolant leaks.
- Verify plasma gas flow: Plasma gas flow rate is critical. High flow will cause rapid electrode wear and hard starting. Low flow will cause uncontrolled arcing. (See cutting tables in your owner's manual for plasma gas settings)
- Optimize assist gas: Increased assist gas helps to keep the nozzle clean and cool. (See cutting table below for optimal assist gas setting)
Set up to optimize cut performance
To maximize the performance of Centricut consumables in your Komatsu Rasor 90/120 system, use the cut settings in the table below
Rasor 90/120 cut settings to optimize performance
Metal thickness in. 1/16 3/32 1/8 3/16 1/4 5/16 3/8 1/2 5/8 3/4 mm 1.6 2.4 3.2 4.8 6.4 8 9.5 13 16 19 Air asist Kg/cm2 0 0 2-2 2-3 3-4 3-4 4-5 4-5 5-6 5-6 Pierce height in. 0.125 0.125 0.125 0.125 0.25 0.25 0.25 0.3 0.3 0.3
- Optimize pilot arc setting: Hypertherm recommends using the lowest possible pilot arc setting to achieve arc transfer. Pilot current is adjustable with a toggle switch on the power supply or as a function in the Operator Control Unit (OCU).
- Shield recommendation: Hypertherm recommends the use of 90-amp shield and spacer ring for all cutting. This shield provides greater nozzle protection.
- Pierce at optimized height: Refer to the cut chart for optimum pierce (initial) height. Piercing too low causes molten metal (spatter) to hit the shield cap and nozzle. This is the most common cause of premature nozzle failure. Piercing too high can cause slow arc transfer, misfires and nozzle damage.
- Adjust arc voltage: As the electrode wears, the torch will get closer to the plate. To maintain optimum cutting height, increase arc voltage in 2-volt increments, up to 10 volts higher than the initial setting.
- Avoid arc stretching: This can occur during rip cutting off the plate or when the lead out is improperly programmed. This shortens consumable life.
- Clean the nozzle and shield cap: Periodically clean the nozzle and shield cap to remove spatter. This will prevent double arcing which shortens consumable life.