Re: [CAD_CAM_EDM_DRO] Re: Cast resin for a cnc mill design - good idea?

Marcus & Eva wrote:

> Remember all those ferrocement boats of the 1960's and 70's?
> They were STRONG!!!
> Ferrocement is just skinny rebar and chicken wire with ordinary Portland
> cement. It makes a shell about 3/4" thick and can be ribbed ad lib.
> It can be easily formed on a rough wooden mold in a home shop environment,
> and can be painted with epoxy paints.

Yep, I remember them. In 1979-1984 I helped rig a Barkentine
(110' LOA, ~65' LWL). We hauled wheelabrator steel shot for
weeks trying to get enough ballast into her. The boat was a
model of the Santana, first ship built in the New World back in
1700+something. It is still around here.

Not only that but there are ferrocement boats being built
regularly just down the street from where I live. And a local
company provides penetrating epoxy to seal the cement once it has
cured, as well as polysulfide for other things.

I remember reading that ferrocement barges were used back in the
1880s. The concept is still alive and well today.

Regards,

JerryK