They (ancients) were good at a lot things that men still can't
explain/understand....


On Tue, Aug 20, 2013 at 3:27 PM, Ruben J=F6nsson <maxruben@rjjournal.net>wr=
ote:

>
> > Short:
> >
> > Ideas sought for low cost low effort way of cutting a say 4"/100 mm dia
> > hole (or larger) through 6" / 150mm concrete.
> > Aggregate but no steel.
> > Can take some days if effective and wholly hands-off.
> >
> > Note: 20mm tungsten carbide tipped drill bit + hammer-drill is low cost
> > (but costly on me) but far far from low effort.
> >
> > _________________________
>
> Too bad we can't ask the ancient egyptians how they did (or other people
> all
> around the globe a couple of thousand years ago).
>
> An example (of many) in figure 3 to 7 here:
> <http://www.gizapyramid.com/mehler%20new%20article.htm>
>
> Note the spiral grooves, indicating a feedrate of the drill of about 0.1
> inch
> per revolution.
>
>
> /Ruben
>
>
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> Ruben J=F6nsson
> AB Liros Electronic
> Box 9124
> 200 39 Malm=F6 Sweden
> www.liros.se
> Tel +46 40142078
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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>
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