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Recent content by axiomatrix

  1. axiomatrix

    Trouble cutting 16ga Aluminized

    You don't want to be using oxygen assist on aluminium based materials as the oxydation is very rapid and violent, it gives you anything from a crap cut to a metal fire - not good news. Use a high pressure inert gas, nitrogen is usually the cheapest. We use a PRC CO2 system and with a cutting...
  2. axiomatrix

    Jagged Edge on SS w/N2 assist

    With Stainless Steel, the dross on the bottom edge of the cut is mainly due to gas pressure and beam centrallity. We cut with N2 pressures exceeding 12Bar and focus set to the bottom surface. This gives a clear kerf and the Hi pressure gas clears the melt quickly before it freezes. The dross...
  3. axiomatrix

    Laser Cutting 3/8 thick Material

    I cut 3/8" mild at around 500W CW with oxygen at 2 - 3 Bar with as fast a feed rate as possible, between 400 - 750mm per sec. Alternatively if the heat input into the plate is too high then using pulsed Wave with 1ms duration and 500Hz to 700Hz. This will give about 1kW average power but less...
  4. axiomatrix

    Laser Resistant Material

    It depends on what you call laser resistant! What is it you want to achieve? Copper is highly reflective to CO2 wavelength, although it will heat up quickly it is able to maintain integrity because its thermal conductivity is high, thats why we use it for cutting and welding nozzles, Just try...
  5. axiomatrix

    Laser drilling of square hole in countersinks

    I've tried to laser cut shaped holes like you are surgesting and have failed miserably. Its basically due to the counter sink or counter bore geometry disrupting the process gas and diverting it of axis from the beam interaction which at best gives a crap cut, the other reason is the size of...
  6. axiomatrix

    Nitrogen Cut Gas Specs ?

    Both of those gas specs are OK, with high speed laser cutting, especially of thin materials the purity of the gas shield is related more to the take up and mixing of the atmospheric oxygen than to the ppm content of the bottled or cryo gas supply. The most important factor is the centrality of...
  7. axiomatrix

    How does sonic flows maintain a steady flow rate if it does?

    Don't know how mathematical you want to get, but the answer may well be found by looking at how converging/diverging nozzles work, i.e. in gas turbines or Laval nozzles. Firstly you need to make a distinction between mass flow rate and volumetric flow rate and to establish that at subsonic...
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