Water circulator with temperature control

I built a water circulator that can supply heated or chilled water to various other shop projects. 

Eurotherm 2132 with platinum RTD (eBay)
CPC quick-disconnect hose fittings (eg McMaster 5012K79)

Intro to DIY Raman Spectroscopy

I've been working on a Raman spectroscopy setup in my shop for a while, and was finally able to collect some real, verifiable data this evening. Raman Spectroscopy is a technique where light is directed toward a target, and the reflected light is color-shifted by the size and type of the molecular bonds in the target. This is a non-destructive way to determine an object's molecular structure. The problem is that the color-shifted light is many, many times weaker than the non-color-shifted light. A Raman spectroscopy setup compensates for this, and allows meaningful data to be collected.

Cookie Machine Project Update 3

Cookie Machine Project Update 2

Cookie Machine project update