Designing a better bed

[Boyan Silyavski]

Linear or volumetric thermal expansion coefficient is irrelevant in constucting a CNC.

First of all cement, steel and concrete have very similar thermal expansion. Even if the epoxy has higher thermal expansion its irrelevant at 1m and temperature changes. Plus the epoxy cement or epoxy granite will more similar expansion to the concrete




EG is same like all, do it properly and it will work well.


There are better options of course and not so expensive- purpose made epoxy concrete, especially made for the purpose. Problem is finding them close to you or in your country at all.

But those who search will find :-).

Key words:

epoxy concrete cast machine bed, ultra-high performance concrete





These guys http://durcrete.de/ can do machine bed design or cast inhouse for you or as far as i remember 1 ton of the stuff was like ~400euro

Gues what i will be bringing home if i go to Germany :-)