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

Dave,
Let's try a slightly different scenario. Rather than filling the
center void with wood, I would use styrofoam, and use it in rectangles to
divide the underside into cells. You'll then have structural members
supporting the underside of the top slab in both directions, and require a
thinner top section. In addition, you should add fibers of monofilament
polypropylene to the concrete mixture. This is the newest method of
reinforcing concrete, that's replaced steel mesh. When you get a little
closer to pouring concrete, I'll give you instructions on how to finish the
slab so it's really flat.
In the past 20 years, I have placed several million square feet of
"superflat" warehouse floor, so a router table should not be a problem.

Marv Frankel
Los Angeles

----- Original Message -----
From: "turbulatordude" <davemucha@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, May 26, 2003 5:21 PM
Subject: [CAD_CAM_EDM_DRO] Re: Ball screw cost and sources - Moglice -
Phillycast - concrete


>
> > Last ditch effort... place fixtures in the concrete that the rails
> > simply bolt to. Then align the rails in typical fashion after
> concrete
> > is hard.
> >
> > If it truly is a first effort though, forget the concrete.... Just
> get
> > something running. The first attempt usually leaves much to be
> > re-engineered on "the next one".
> >
>
> I would think that for a first attempt, I would take a couple pieces
> of steel channel, fill the center void with some bits of wood, then
> pour the table. the wood would allow you to drill and tap the steel
> and the mass would offer stability.
>
> but the very first attempt using concrete would seem like a stretch.
> I have all the pieces for a small 8" x 12" work envelope from a
> single 4' x 8' sheet of 3/4 MDF.
>
> runners and leadscrws for a small wood router would let one get some
> experiance in the subtleties of all the various features.
>
> then tackling the metal milling unit would be done with experiacne
> and confidence.
>
> Dave
>
>
>
>
>
>
>
>
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