Re: Epoxy-Granite machine bases (was Polymer concrete frame?)
Keep in mind that epoxy percentage by weight can be deceiving.
A 4% mix by weight with 2 mm aggregate will be covered with a layer epoxy roughly half the thickness compared to a 4 mm aggregate.
As long as you use the same aggregates in the same proportions, you can use % for your epoxy recipes but they will not be interchangeable with recipes for other aggregates.
It is a very good looking base though!
Sven
http://www.puresven.com/?q=building-cnc-router