Explaining the CNC casting patterns, Part 1

Here is a 2-part series with me going through and explaining all the patterns, one by one, that I used in pouring the castings on my D.I.Y. CNC router that I finished in May of 2016. Part two is here:
https://youtu.be/O3Var8TbuNk

You can see a build log and some action shots of the machine here:
https://www.youtube.com/watch?v=j56nl06Ok0U

Visit my web site for more projects:
http://www.dansworkshop.com/