Re: [CAD_CAM_EDM_DRO] Re: XYYZ Gantry, better glas caving

Hello John and Peter,
If you want to make longer runs with diamond tools forget about
any diamond covered tool bits. Specially from the brand you mention.
Get yourself a solid sintered diamond bit for testing out of the dental deposit
or odontologic supply center. They are sometimes expensive: between 20 and 80 bucks
for the really good ones.
But my 80 buck one lasted 5 years and perhaps much more than 250 hours in steel and crome cobalt. And normally you are told that
diamond does get eaten up from plain steel.
The cheaper ones still last some 20 hours in steel and longer in glass.
Possibly after testing you will not buy any ... brand bits any more.
Good luck
Sven Peter


kleinbauer@... wrote:

> Hi Peter,
> First of all both the Y and Y are wired together. They
> are not wired to separate outputs of the controler in most cases. See
> one at:
> http://www.geocities.com/luberth.geo/plotter/plotter.htm
>
> You emailed asking me about my glass etcher. Here is what I
> learned. If you just want to add a signature or small flowers to the
> corner of a mirror, it can be done! If you expect to put a portrait
> on the glass stop right now!
> Glass is very hard and hobby machines are too slow. A simple
> drawing from Corel saved as a DXF converted into Gcode will run over
> an hour. A Dremel diamond covered bit will not hold up that long!
> You asked me about GLASSMAN. Glassman was a square base with
> the center cut out. It looks just like the plotter on the above link.
> Glassman sits up on four suction cups above the glass. The cutting
> tool goes down past the opening to hit the glass. The Z-axis is
> lowered down onto the glass. The Z assemble can float a little, there
> is a spring pulling down on the Z-axis.
> I got commissioned by a so called friend to build a CNC
> machine that cuts paper rolls for crank organs. My job was to build
> the electronics for the machine. I sent parts of Glassman as a demo
> to prove my electronics work. The so called friend never sent back
> my parts.
> My friends own a glass company. They send out the glass
> etching work. The etching is done by a man in a spacesuit in a sealed
> room. Glass beads are shot at the glass. The reverse of the design is
> put on the glass with tape. The man is able to adjust for variations
> in air pressure. He only charges $100 to do a store front!
> I think it is possible to put grit on the glass and design
> a tool that moves over the glass pushing down the grit and causing
> a pattern to be cut. Have fun!
>
> John
>
>
> --- In CAD_CAM_EDM_DRO@y..., Peter Chen <cadcamcenter@y...> wrote:
> > XYYZ GANTRY
> >
> > Good morning,
> >
> > Asking for opinions on XYYZ gantry. I believe this
> > configuration will involve having 2 lead/ballscrew and
> > 2 stepper motors for the Y axis. Suppose one of the
> > stepper on the y axis lose step. Does this mean that
> > the x and y axis will no longer be perpendicular to
> > each other? With this arrangement how does one ensure
> > squareness?
> >
> > Thanks
> >
> >
> > Peter
> >
> >
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