On Fri, 23 Sep 2011 20:35:25 -0400, "Ed Huntress"
wrote:


"Karl Townsend" wrote in message
news

Overall, you probably would learn a lot of useful and interesting things
by
giving it a try. You have the right idea about using spot-welded mesh or
something similar to get a mechancial bond. Concrete doesn't stick well to
flat steel when it's vibrated a lot.

There's a thread with nearly 3000 posts on CNCzone concerning building
machines with steel weldements and using epoxy resin and rocks to fill
and provide damping. Several machines have been built this way.

Karl

That sounds like a lot of reading, but it might save Bob more time than he
would lose by experimenting with structures that take a while to build.

BTW, those concrete-filled machine tools typically use a polymer-modified
concrete that provides better bonding and more vibration resistance than
Sakrete.

I scanned the thread one night. Lot of discussion on the fill
material. It was called polymer concrete at some points and epoxy
resin at others. Lots of discussion on the proper aggregate and size
distribution of it. The whole idea is to dampen vibration.

Karl