Re: [CAD_CAM_EDM_DRO] Reflective pickup

Do you have a part # for the inductive pickup?
Jim

----- Original Message -----
From: "Kim Lux" <lux@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, November 28, 2003 8:33 AM
Subject: Re: [CAD_CAM_EDM_DRO] Reflective pickup


> I used an inductive pickup, made by Cherry and sold by Digikey. It
> works very well. No other signal shaping electronics is required.
>
> In order to get the 10 to 30% duty cycle necessary for TCNC to get a
> proper spindle signal, the "tooth" that the pickup "sees" has to be 10
> to 30% of the circumference of the perimeter. (I hope that made
> sense...)
>
> The sensor tooth must have a round face. If one uses a square tooth,
> the pickup will sense the leading edge of the tooth, then turn off, then
> sense the ending edge of the tooth, giving you 2 (TWO !) pulses, neither
> one with enough duration to quality as a signal for TCNC.
>
> I helps to have access to an oscilloscope when setting up the sensor.
>
> I sent Dave K some pictures of my sensor setup. He may have posted them
> in the public area of the TCNC board. I no longer have those pictures
> on this computer.
>
> Kim
>
>
> On Thu, 2003-11-27 at 23:39, wanliker@... wrote:
> > Can anyone on the list give me a suggested part numbet to add a pick up
on a
> > Sherline lathe for TurboCNC threading.
> > I don't want to use a tab on the Sherline pulley due to the danger it
would
> > present.
> > I am looking for something that can see either a reflective or a BLACK
spot
> > with mimimial dimensions, working distance in the range of 1/4" to 1/2"
+
> > range.
> > I want the type that will sense off the end or side of the device, but
not
> > the type that has a U shape with pickup between the U sides.
> > Or if you have done this to a Sherline, Please describe what you did,
and
> > what part/parts you used. And would you do it the same way again?
> > Any suggestions would be greatly appreciated.
> > Thank You,
> > bill
> >
> > Cross posted to other groups.
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
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> --
> Kim Lux <lux@...>
>
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>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>