Glad to see other member are researching E/G What we need to know is the mix ratio of epoxy to filler by weight.
Episs price looks realy good.Maybee you could E mail them again and ask how much epoxy is encluded,then we can calculate the mix ratio.You would'nt want to ship 400lbs of sand.Buy the epoxy and source the filler locally.By the way you are in Latvia.I use lots of birch ply from your country.
Here is some info if anyone wants to calculate volume.
1 gallon of material,1/4"thick is 6.4sqft
1gal of epoxy=10lbs.
1gallon of granite=24lbs
1cuft epoxy=7.2gal
1cuft granite=166lbs
Mark good stuff on particle sizing.Ihave only used graded fillers in the 20 to 200micron size.The idea is to use different particle sizes to fill in the spaces between the larger sizes.To get the 15% epoxy ratio I imange you would need fine gravel and graded fines to reduce the resin demand.Another trick is to add milled glass fiber 1/32"which increases the bond strength.Over 60% fill the mix is getting beyond pouring consistancy.I might add E/G for machines is subject to vibratory compaction which is "you gotta shake the hell outa it".
Pimo&geof
Why epoxy over portland as a bonding agent ? It is more expensive, must be better.Just kidding.Simply put epoxy is a superior"glue"which does not shrink and is fullly cured and stable in one week.Portland can take years to settle.
Water+steel=IO2=rust.good luck getting your portland out of your mill upright.
Greybeard
Great minds think alike.I am working on the same idea.For the table I will use W-13 wide flange I beams for the perimenter of the table.The beams are 4"x4".Filling the interior with 4" of E/G would be too expencive.I working on a sandwitch.Two E/G surfaces with a honeycomb core[niacore]Honeycombs used in boat engine rooms reduce sound transmission which also means they absorb vibration.Here is a link you will like.www.precisionepoxy.com.Your final unfilled epoxy pour will level to .005.now you have a perfect surface to mount the linear guides and reference to gantry squaring.
Hey Guys found the link which answers many questions.Try Google
machine design polymer castings.
If you guys still have intrest,
tomorrow I will post an epoxy 101
Larry
Granite chip sweeper