Re: [CAD_CAM_EDM_DRO] Re: Digitizers, Renishaw

>But it has occured to me that nobody
>really got what I meant by optos.
>Imagine the optos that are used to break
>a light beam when your x-travel gets to
>home position.
>
>But they don't have to be on/off light
>beams. Shine one at an angled or curved
>surface and it returns a analogue value
>in volts. ANY movement of the reflecting
>surface will cause the exact amount of
>light to change, up or down, giving a
>"hit".
>
>You don't need to make it so it measures
>the movement, just detects it. This is
>easy, the signal can be "zeroed" every
>time, then as the probe is lowered ANY
>change in signal from the opto(s) will
>give a "hit".
>
>