Re: [CAD_CAM_EDM_DRO] Re: sensing a part - fiberoptic

I think you missed the point. there's only a need for one cable for most of
this setup. Think of it this way:

LED Photo-transistor
| \ /
| \ / /|\
| \ / |
| | |
\|/ | |
|
object to be sensed

The, "Y", connector can even be mounted on the circuit board, with the opto-
cable going from the leg of the connector anywhere you want; I.e., just one
cable. The light from the LED travels up/down the same cable simultaneously as
shown by the, "arrows". This circuit was originally used as part of an audible
object/obstacle sensor for a blind man's cane, so it works fairly well over
several inches distance from the end of the opto-cable. That gives you a lot of
electronic adjustment room with respect to resistor values/sensitivity, etc.

As to coolant and chips, I'd think putting the sensor end in heat shrink tubing
might work.

Bill

On Mon Mar 24 04:58:46 2003 turbulatordude wrote:

>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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--
----------------------------------------------------------------------------
RKBA! ***** Blessings On Thee, Oh Israel! ***** 4-19!
----------------+----------+--------------------------+---------------------
An _EFFECTIVE_ | Insured | All matter is vibration. | Let he who hath no
weapon in every | by COLT; | -- Max Planck | weapon sell his
hand = Freedom | DIAL | In the beginning was the | garment and buy a
on every side! | 1911-A1. | word. -- The Bible | sword.--Jesus Christ
----------------+----------+--------------------------+---------------------

Constitutional Government is dead; LONG LIVE THE CONSTITUTION!!!!!

----------------------------------------------------------------------------