< > [subtractive](index.html)
### Laser cutter
<ul>
<li>[Laser types(Wikipdedia)](https://en.wikipedia.org/wiki/Laser_cutting)</li>
<ul>
<li>CO2- 10 micron</li>
<li>Nd-YAG - 1.06 micron - [optical reflectivity](Metal_reflectivity.png)</li>
<li>UV</li>
<li>femtosecond optical - [review](ultrafast.pdf)</li>
</ul>
<li>Processes</li>
<ul>
<li>Vaporization: melt, increase absorptivity, physical erosion by heated ejecta.....</li>
<li>melt and blow: gas jet assisted metal cutting. </li>
<li>Thermal stress - glass cutting.</li>
<li>Reactive cutting: e.g. oxygen-assisted metal cutting.</li>
</ul>
<li>[Jake's laser: Fablight - 1.5kW fiber laser](http://3dfablight.com/)</li>
</ul>
### Focused Ion Beam
Used for imaging, deposition or ablation
### Laser Direct Sintering
* [3D MID](http://www.lpkf.com/products/mid/)
* [e.x. Festo Ants](https://www.youtube.com/watch?v=aBfKoKHEzPQ&feature=youtu.be)
## Electrical Discharge Machining (EDM)
### Wire EDM
* [making precision parts](http://www.intellectualventures.com/insights/archives/ivs-favorite-inventions-the-babbage-machine/)
<br>
### Sink EDM
* Referred to as Ram, Sink or Plung EDM
* need sacrificaial die
* $$$
### EDM hole popper
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