Re: [CAD_CAM_EDM_DRO] Re: Digitizers, Renishaw

Jon Anderson wrote,

>Ian Wright wrote:
>>
>> Hi,
>>
>> I'm surprised that no one has yet suggested a capacitive probe.
>
>Not like I know what I'm talking about here, but what about piezo
>electric sensing? Might be a challenge to provide enough rigidity to get
>accurate sensing and yet prevent damage from mechanical overload.
>
>Jon

All these things have been tried. We have a store room at work with strange
shaped lumps that people have tried to make work as probes. As far as this
discussion is concerned though (ie the need for a simple, cheap easy to
make probe) I would suggest you forget the weird and wonderful sensors and
concentrate on the simple switches. The reason is all of the other
techniques require significant electronic input to sort the noise, temp
drift, ageing etc from the required trigger signal.
Keep it simple!

Regards
Bill Phillips