Re: 3D Scanner/ Dizitizer

Can't you use a more accurate ADC like a 12bit ADC to get better
digitizer accuracy?


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "ballendo" <ballendo@y...>
wrote:

> Hello,
>
> The range of this device is 10-80 CM. And the output is 0-255 (8bit
> ADC), so that's about .275" per bit. Pretty coarse...
>
> Hope this helps,
>
> Ballendo
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "caudlet" <info@t...> wrote:
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "ruanb1" <rrbasson@t...>
> > wrote:
> > > Hi Guys
> > >
> > > Just an idea, I am thinking off. It sure would be nice to be

able

> > to
> > > have a scanning system (affordable) without the contact like

the

> > > probes.
> > >
> > > I was thinking: Can one not use the distance sensors (which is
> > > cheap) mounted on the axes to fulfill this, I mean we basically
> > > would just like distances, and with software then create the
> > > models???
> > >
> > > Have any of you thought in this line or build something like

this

> > on
> > > your CNC machines?
> > >
> > > It surely would not break the bank (although it might be hell

of

> > > slow scanning).
> > >
> > > Would appreciate your ideas
> > >
> > > Regards
> > >
> > > Ruan
> >
> > Take a look at:
> >
> > http://www.hvwtech.com/pages/products_view.asp?ProductID=347
> >
> > Infrared (pulsed) short distance sensor. They have several
> models.
> > Serial (RS232) output feeds back digital value of analog distance
> or
> > one model has adjustable trip point and just sends back a single
> bit
> > logic level.
> >
> > The challenges are to get past the different reflectivity of an
> > object and to determine the accuracy and repeatability.
> >
> > Ambient light is not a problem due to the module having it's own
> > infrared output and it being pulsed at a frequency that is

detected

> > by the same receiving module. It uses a focused beam and

receiver

> at
> > angles so it can only operate in the area of convergence.
> >
> > Price is right (<30 bucks) if it is usable.