Digitizers, Renishaw

Hi Bill
Of course I don´t mind. It´s interesting stuff .
I wondered how the VAST-Head of neu ZEISS Prismo is working.
Do ou know that.? ( Sure it is not Your company, but when I was at AUDI in
their research center I saw lots of Mercedes, BMW, even Jaguars in there).
But two things:

>>quite simple and there ist no need for high accuracy .

>You are at least partly right but I think you will find it is much simpler
>to calibrate if the stylus is on the same axis as the mounting screw.

For home-shop digitizing I usualy don´t need calibration. At work I use the
Renishaw for example to mashine the valve-seats guides of Mercedes racing
motors exactly fitting to the valve guides Compensating temperature-failures
and position-failures. I would not use a home-made probe for that.

>Sounds like you have one of the big ones. I just measured a probe I have in
>the workshop and it is only 13mm external diameter. The bigger ones are
>normally used on the big machine tools and are designed to cope with long
>stylus with large balls on the end. You may find that it is rather stiff
>for digitising especially on soft materials.

The spring is adjustable, and because I use it only vertical I adjusted it
very soft.

( By the way , I saw a small Renishaw on ebay about 6 month ago. It was sold
for 90$)

Thanks for the answer

Peter