Progress and Notes:

Laser Training Takeaways:

    The wavelength of the laser has very different characteristics.    The 808nm we are looking at using will actually shine through a couple of layers of skin and then start burning.    It also isn't really visible, so you may not know it is happening.    Pretty dangerous.   For 40Watts, the goggles should have a rating of 4.5-5 to protect eyes.    Make sure that the goggles cover the wavelengths we are working with... they tend to have very specific curves (not one size fits all).

    Aside from direct exposure to the beam, the reflections are dangerous.    You may not know that there has been eye or skin damage.

    Different case materials react differently to different lasers.   We need to do some investigation to determine what the best material is.   In the training, they had simple enclosures made of tinted plastic.

    There is a expanded metal mesh on the bottom to dissipate the beam.    Typically, the enclosure should dissipate the energy.

    The MIT safety people would be happy to come over and review our setup.

    MIT will provide before and after eye exams.

    If enclosed properly (in a lightproof box) then there is no problem making a class 4 laser that is class 1 safe.

ToDo list (before end of term)

  1. Laser power supply for diode.
  2. Interlock circuit.
  3. Other laser cutter related experiments, investigations, etc.
  4. Experiment with extruder for 3d printer.     (Controller, construction, etc)
  5. Positioning assemblies to support the above.   (Drivers, mechanics,  etc)