Re: [CAD_CAM_EDM_DRO] Re: Ball screw cost and sources - Moglice - Phillycast - concrete

Stephan,
Gravity, along with vibrating the concrete, is not going to give
you a perfectly flat finish. Take a look at my reply to Dave several hours
ago, and you'll get a better insight into the correct method. The last
sizeable "superflat" floor installation I did, consisted of 40 warehouse
aisles, each 600 ft. long X 52" wide, poured with 8000 psi concrete. This
structure, in New Orleans, was 1.2 million sq. ft .

Marv Frankel
Los Angeles

----- Original Message -----
From: "Stephan Kotzé" <stephank@...>
To: <caD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, May 27, 2003 1:11 PM
Subject: [CAD_CAM_EDM_DRO] Re: Ball screw cost and sources - Moglice -
Phillycast - concrete


> Hi guys
>
> I have also been toying with the idea of using a concrete cast reinforced
base. A few OEM machine builders use them in their machines, as concrete has
excellent vibration absorbing properties, and is used in high speed milling
machines. My idea was to use a self levelling screed to give the final
flatness. I was planning on using a orbital sander to "tap" the mould during
the initial cast to get rid of trapped air bubbles, and during the screed
pouring to let gravity along with the tapping action give me a perfectly
flat finish, essentially water level.
>
> For the main beams, I was also planning on pouring concrete into the
square tubing to stiffen them. Problem is the binding of the concrete to the
inside of the tube. I thought of using some studding running through the
tube with two endcaps and a couple of bolts to pre-stress the whole unit,
the same way pre-stressed concrete flooring slabs are manufactured.
>
> Stephan
>
>
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