Re: sensing a part - fiberoptic

Interesting method.

I have a Vee block so could use that as a point the edge passes. I
would assume that the 2 cables would be aligned with the end of the
bar rather than along the lenght.

Any idea how the cable would stand up to coolant or chips ? I don't
expect either to be a continual problem, but if it were extreeemly
sensitive, that would pose a problem.

Dave

--- In CAD_CAM_EDM_DRO@yahoogroups.com, ccq@x wrote:
> Howdy TD;
>
> Try a fiberoptic, "Y", connector. Drill a small hole in the end of
an LED, and
> glue the end of a piece of fiberoptic cable in it. The other end
goes into one
> arm of the, "Y", connector. Do the same to the other arm, but with
a photo-
> transistor, or other optical sensor, instead of an LED.
>
> Light from the LED goes down one arm, and out the leg of the, "Y",
connector,
> which can be directed anywhere with a piece of fiberoptic cable.
Whatever comes
> near the end of the cable, will reflect some of the LED's light
back up the leg
> of the, "Y", connector, and from there some of it will go into the
arm that has
> the photo-transistor, where the light is sensed.
>
> Bill
>
>
> On Sun Mar 23 18:35:23 2003 turbulatordude wrote:
>
> >Hi all,
> >
> >I feed a part and then want to detect the end of the part so as to
> >zero to the end of the part.
> >
> >I am only trying to find one side, not both X and Y or X/Y/Z
axisies.
> >
> >The part is 1 inch round. I was thinking of putting some type of
> >sensor to detect the edge and need to be within a few thou, (no
more
> >than 5 thou off)
> >
> >I was hoping I could use a proximity or capatance or even a photo
> >detector of some sort.
> >
> >The part passes thru so I cannot use an end switch.
> >
> >any suggestion ?
> >
> >Dave
>
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