Re: Glass cutting

Hi Eliot,

I would like to know more about this kind of procedure. If the wheel
is wet... then bang ... So, can you explain little

TIA


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "optics22000" <elliot@...>
wrote:

>
> On the topic of home shop CNC cutting of glass, I used to cut

glass

> by first using a wheel to scribe it, then chasing the crack around
> with a bit of red hot nichrome wire. It only took a bit of

current

> to heat the wire, the heat would cause the crack to open if

applied

> immediately after the scribe.
> It is easy to imagine using this technique with CNC. Either a

head

> could be made containing both the scriber and the hot wire, or

after

> scribing the head could be changed to a hot wire.
> Tapping is used manually to enlarge the scribed line to a crack,
> maybe a buzzer could be adapted for this purpose?
>
> If you had a CO2 laser, that would be ideal for the purpose of
> enlarging the crack. The 10.6 µm light is absorbed very

efficiently

> by common glass.
>
> regards-
> Elliot
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Tony Smith" <ajsmith@>
> wrote:
> >
> > > On Oct 22, 2006, at 6:38 PM, Jack Coats wrote:
> > >
> > > I know it is not the same thing, but has anyone tried
> > > 'milling' glass, to 'mechanical etching'?
> > >
> > >
> > >
> > > It is done all the time and has been done longer than what
> > > you might call "machining.". but it is called "grinding "

see

> > > lapidary. it does need to be cooled . Heating the glass
> will
> > > make things worse.
> > >
> > > The cnc glass cutting technique is done on VERY thin stock --
> it
> > > won't extrapolate to even normal thin window glass. it
> isn't
> > > hard to orient the cutter wheel but you need more than just

a

> > > scratch to break thru. Search glass breaking pliers and

also

> > > glass cutting. The burglar technique isn't how it is really
> works .
> > >
> > > Silicon chips from wafers are sawed not cut by breaking
> although
> > > the machine described cuts glass near wafer thickness.

There

> is
> > > an interesting technique shown where the carbide wheel axle
> > > hole is cut with a spline or like an internal planetary gear
> > > to put enough vibration in to run the break.
> >
> >
> > That site was claiming to cut 6mm (1/4") glass on that machine.
> Neat trick
> > if it true. Or I read it wrong :)
> >
> > Tony
> >
>