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

Dave,
The reinforcement fibers are chopped up, and are readily available.
You can probably get some from almost any ready-mix concrete supplier, or go
into Google, type in "concrete Reinforcement", and you'll find tons of
suppliers. If you only need to pour a few square feet, you should have no
problem getting it pretty flat. A typical scenario for a 2' X 4' slab would
be to use accurate steel or aluminum forms on all 4 sides, and when the
concrete is poured, screed off with an accurate metal screed, with a sawing
motion back and forth, moving the screed down the slab. When the concrete
sets up a little, you'll have a slab with some low spots, but no high spots
at all. In order to fill the low spots, you make a pretty soupy mixture of
cement/sand/water, and using a straightedge in almost the same method as the
screed, pour some of the soupy mixture ahead of the straightedge, to fill
the low spots. After this sets a little, it's then finished with a steel
trowel. I hope this gives you some insight into the method. If not, just
holler.

Marv

----- Original Message -----
From: "David A. Frantz" <wizard@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, May 27, 2003 5:39 AM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Ball screw cost and sources - Moglice -
Phillycast - concrete


> Hi Marv;
>
> Thanks for the info.
>
> Is the monofilament polypropylene commonly available? Kinda sounds
> like fishing line to me, given that I could see where it would make an
> excelent reinforcer.
>
> Not to push the subject to much but are the finishing methods you allude
> to feasable for somebody who is tooling challenged. That is my shop
> may not be as well equipped as those of some of the other memebers of
> the list. Ideally I'm looking for something that I can fabricate and
> get flat over a couple of square feet to within a couple of thousands.
>
> If the either fabrication method (concrete or a doit yourself
> Phillycast) is to unreliable for the average home shop user then I can
> go back to searching for used mills to prototype on. On the surface
> either one of these methods looks like an ideal method for simple
> machine framing.
>
> Thanks
> dave
>
>
> dcdziner wrote:
>
> >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
> >
> >
> >
> >
> >>>>>>>>>>>snipped<<<<<<<<<<<<<<<<<
>
>
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