OMAX:Training

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OMAX Training Syllabus

DO NOT use the machine unless someone has trained you!

Overview of the machine

  • Water supply
    • Source, filters on wall
    • Toilet tank
      • Three clear hoses – should be clear, no bubbles
        • If not, pump overhaul soon
      • Screen feeding to filters should be clean
    • Filters above toilet tank
      • Both pressures should be near 120 PSI
      • If pressure differential > 20 PSI, change filters
    • Pump Manifold
      • Clear hoses = cooling water
      • Gray hoses = water feed
      • Continued under pumps/engine
    • Weir Tank
      • Will need drain professionals to clean (same with table)
    • Solids removal system
      • Clean SRS nozzle and tub when leaving
  • Air supply
    • 75-80 PSI
    • Used for raising/lowering water tank, valves, etc
    • NEVER cut air lines to a shorter length
  • Electrical
    • Feeds engine VFD, computer box
    • Machine grounding is very important
      • Needs own earth-ground!
  • Pumps/engine
    • VFD controls motor frequency
      • Do not leave the display unit plugged in on the VFD
    • Pre-charge pump
      • Turn off to make sure jet won’t fire
      • Will have to hit pump reset button if jet tries to fire when off
      • If on, should get water draining in tank through upper hose
    • Electric motor
      • Drives crankhouse via belt
      • Controlled by VFD
      • Set pressure with pump control panel
        • Must be running to see actual pressure
        • Tell the computer!
    • Crankhouse
      • First oil change after 50 hours, afterwards every 300-400 hours
    • Pressure manifold
      • Raises water to 50 KPSI (high) or ~20 KPSI (low/pierce)
      • After manifold, water has two possible routes: cut or dump
    • Needle/seat valves on dump and cutting nozzle
      • Always toggled in opposite states with air
        • This is why air hose length is vital!
      • Will need replacing
        • If upper tank drain hose leaks during long cut, time to replace dump needle/seat
        • If nozzle (with pre-charge pump running) leaks when not cutting, time to replace nozzle needle/seat
  • Nozzle assembly
    • Shut off pre-charge before attempting nozzle removal!
    • Show mixing disc, jewel, nozzle
    • Jewel goes brass side up!
    • Rotate nozzle slightly at the beginning of each use
    • Rotate mixing disc and jewel once per week
    • Change last-chance filter during any nozzle/jewel change
    • Show needle/seat assembly
    • ALWAYS use blue goop on threads
    • Three thread rule
  • Abrasive
    • Show path of abrasive from holder to nozzle
    • Show how to disassemble Bimba valve in case of a clog
      • Make sure Bimba valve is upright
      • Make sure sliding part is all the way in
    • What to do if abrasive line pops out
      • Pause machine
      • Figure out why it happened and correct problem
      • Put on eye protection before air-blasting
      • Remove abrasive feed line and air-blast thoroughly
      • Air-blast Bimba valve, removable sliding part, feed line holes
      • Re-assemble Bimba valve, do abrasive only test fire to check flow
      • Re-attach abrasive feed line
      • Backup on tool path and continue
    • If the abrasive hopper is almost empty, put a bag of abrasive in

Overview of operation

  • X,Y,Z motion with mouse, arrow keys
  • Setting and clearing home positions
  • Test firing
    • Never put hands near jet stream when operating, or when pre-charge pump is on even if not operating
    • Move jet to back of table
    • Do water-only test fire and make note of stream quality
    • Do water with abrasive test fire
    • Mention abrasive flow rate calibration
  • Buttons on main control unit
    • Pause – same as clicking the pause button on the screen
      • When resuming, don’t forget to back up a bit first
    • Babysit switch – acknowledge/override
    • Emergency stop – kills machine, also located on pump

Overview of Layout/Make

  • It is best to learn this material mostly using the training DVD, so this should mainly be a quick review and recap of important features
  • Layout
    • Give quick overviews of the following
      • Importing DXF files
      • Cut quality/etching/scribing
      • Piercing, when not to pierce
      • Manual addition of lead in/outs
      • Manual generation of toolpaths
      • Automatic generation of lead in/outs
      • Automatic generation of toolpaths
      • Cleaning up a drawing
      • Configuring toolpath for Make
      • Double-checking toolpath
      • Exporting to Make
  • Make
    • Give quick overviews of the following
      • Picking material and thickness
      • Show list of materials sorted by machinability
        • Don’t pierce into laminates!
      • Nesting
      • Stacking
      • Setting a path start home, user homes
      • Move to point on path
      • Dry runs
      • Pump/nozzle settings
        • Abrasive index
          • HPA = 0.96
          • HPX = 1.0
        • Abrasive flow rate
      • User should now be ready to go through the start-up list

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