Re: making a digitizer probe

It seems that there may be some other ideas about, too. I have
a "cheap" scale (0-100 grams) that is commonly available and uses a
load cell. Seems that some varient of this might be quit useful as
well... These loadcells can be extremely sensitive.

So suppose you set an item on a rotary table. set the 'scan for
maximum cylindrical radius and radially scanned the height slowly.
then brought the probe in a bit - do it again. slowly scan the
beast... this would be a slow, simple method...

could also "hand scan' with a xyz position indicator and then do the
same trick to 'microscan' to get the fine details....

I heard one person ponder hacking two cheap, precision scanners to do
this - but that seems full of math and some problems.

There were the TrueTrace attachments for use with Bridgeports. I am
going to try this out too, and see if I cannot adapt this to be
moderate capture device for my application.

In all these approaches, it looks like there are several common
phases.

-- gross image capture
-- finer resolution caputure
-- very fine (ie, angeled details and FFT surface study)

most will not want the last two parts....

then.. how do you work with the caputured image? That will vary a
lot too! And can your image capture be via touch or does it have to
be optical? or sonic?

I think I will stick with simple for the moment and keep it cheap!

-- jr

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

> Graham,
>
> This had been discussed many times before. If you search the group
> archive on digitiser, and digitizer; you will have lots to read.
>
> There was an excellent rendered model of a very "buildable"

digitiser

> based on the renishaw patent (now expired) in our files section. I
> looked for it recently, and could not find it.
>

-- snip....