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NeoTech:
If i can, i will try to source premixed aggregate - actually nothing that is sold in Sweden.. Dont know why. Something something, about enviroment something something.. :scratch:
You know those dilly wagger tree huggers, making it hard for people doing what they want.

If you have suggestion on a premix by name, i can see if i can source it from somewhere close, would be much appreciated.

The idea of the steel metal parts.. Well for one thing, what kills concrete in the end, vibrations that have broken it up and it wither and well breaks down.
And after looking at several of large machines built with this technique i notices they hade alot of sheet metal steel parts and fasteners within the casting.
But yes, i will still need to make forms/molds for casting this, its not a way to get around that problem. Im more thinking ridigity.
And when simulating this in solidworks, it reduces the elasticity of the casting by alot - so it seems to worke like rebar.. =)

About the 1.5kW motors. uhm well.. i talked to this chinese lady that really doesnt seem to speak english. And after alot of back and forth it ended up with "i take what the 99.8% of your other customers want in a 130mm frame".. and i got these.. they cost me like 600 usd, so not that expensive actually. =)

So if i wanna run a larger, longer table, that would mean i would make the saddle smaller. The big issue i see with that is that a smaller granite casting, even with reinforcment would be prone to breaking and flexing. And sure i could just make a larger table and space out the rollers, but that would limit travel instead. I need to ponder this tho, many people suggests the larger table, and just bolting down a wider palette ontop of that palette doesnt seem to be a good solution based on that. =)

NeoTech:
Well here is the build video that started me on this route anyway. =)

Brass_Machine:
That is an interesting video.

I will be watching this as much as I can. Have a huge interest in it. Spent most of a day a few years back reading the huge thread on CNC zone about this stuff. I have ideas to build on myself.

Eric

NeoTech:
To note from that video is that he uses a high performance fiber filled concrete for the base. And the polymerconctete is used for the saddle.
He does use some internal structures but most of it is just rebar bent and twisted and then welded to the anchoring points.
That will surely prevent ripout - but will it prevent fluid dynamics during resonance.?

The cnczone epoxy granite thread is mainly 600+ pages where the useful stuff is less than 20 pages. (i know i read em all, twice) ;D

There is actually several german and chezch builds with the material; polymerconcrete and high performance concretes.

And one thing that hits me after digging into this subject for the last 3-4 months - their machine bases is basicly completely dead in a resonance perspective.
Not even my half ton Aciera mill is that quiet many times when running a crab or a large endmill. =)

sparky961:
I've come across this idea before in various threads but have yet to read exactly why you'd do this. I'm just looking for the the main talking points, not trying to start an argument or debate on the merits.

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